Abstract

b), a quadrature demodulation and data acquisition module (12), and an image display unit (13). By using an Inverse Synthetic Aperture Radar (ISAR) imaging principle, the millimeter-wave real-time imaging based safety inspection system performs real-time imaging on an object to be inspected when the object moves, so that not only the imaging speed is improved, but also the field of view is enlarged. A safety inspector can determine whether an inspected person carries dangerous goods by observing a three-dimensional diagram of the inspected person, thereby eliminating the inconvenience caused by back-and-forth movement of a safety inspection device used by the safety inspector around the inspected person.

IPC Classes  ?

• G01S 13/90 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging using synthetic aperture techniques
• G01S 7/41 - RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - Details of systems according to groups , , of systems according to group using analysis of echo signal for target characterisation; Target signature; Target cross-section
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications

Abstract

A plasmonic waveguide (10), a biosensor chip (100) and a system, wherein the plasmonic waveguide (10) is applied to the biosensor chip (100), and comprises a base (11) and a plasmonic structure (12) provided on the upper surface of the base (11); the plasmonic structure (12) comprises a plurality of plasmons (121) periodically arranged, the plasmons (121) being metal split rings, and the annular openings of the plasmons (121) being used for fixing antibody probes (122). The plasmon waveguide (10) is provided in the biosensor chip (100), the target biomolecules in the detection liquid flowing into a microfluidic channel (31) can be captured by means of the antibody probes (122), and the plasmonic waveguide (10) is used to enhance the signal strength of terahertz waves emitted to the biosensor chip (100), thereby enhancing the signal strength of the reflected terahertz waves detected by a terahertz analyzer (300), improving the detection sensitivity, the signal-to-noise ratio and the reliability.

IPC Classes  ?

• G01N 21/3577 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation
• G01N 21/552 - Attenuated total reflection
• G01N 33/53 - Immunoassay; Biospecific binding assay; Materials therefor

Abstract

A millimeter wave image based human body foreign object detection method, comprising: acquiring a millimeter wave gray scale image of a human body; according to a pre-determined foreign object imaging characteristic, extracting from the millimeter wave gray scale image a foreign object area image; according to a pre-determined foreign object image recognition algorithm, performing calculations on the foreign object area image, and acquiring a foreign object image from the foreign object area image; displaying the foreign object image as a foreign object detection result. Also provided is a millimeter wave image based human body foreign object detection system.

IPC Classes  ?

• G01V 8/00 - Prospecting or detecting by optical means
• G01S 13/90 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging using synthetic aperture techniques
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications
• G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified

Abstract

A terahertz full-polarization-state detection spectrograph is provided, which comprises a terahertz wave generator, a polarizer, a polarizing beam-splitting sheet, a horizontal terahertz detector, and a vertical terahertz detector. The terahertz wave generator produces a terahertz wave, and the purity of the terahertz wave is optimized by the polarizer; a detected sample modulates the terahertz wave, the purity of which is optimized, to obtain a terahertz modulated wave; the polarizing beam-splitting sheet decomposes the terahertz modulated wave into a horizontal terahertz wave and a vertical terahertz wave which are vertical to each other in a polarization state; the two corresponding terahertz detectors are used for detecting the two terahertz waves respectively, and then the characteristics of the detected sample are analyzed according to the detection result.

IPC Classes  ?

• G01N 21/21 - Polarisation-affecting properties
• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation

Abstract

A terahertz metamaterial waveguide and device are provided. The terahertz metamaterial waveguide comprises a subwavelength substrate layer and a metal layer. One surface of the subwavelength substrate layer is plated with the metal layer, and a plurality of periodically-distributed micropores is formed in the metal layer. The subwavelength substrate layer, the metal layer, and the formed plurality of periodically-distributed micropores are described.

IPC Classes  ?

• G02B 1/00 - Optical elements characterised by the material of which they are made; Optical coatings for optical elements
• G02B 6/10 - Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
• G02B 6/122 - Basic optical elements, e.g. light-guiding paths

Abstract

A terahertz spectrum test device and system includes a femtosecond fiber laser configured to generate a pump light and a probe light. The pump light excites a terahertz transmitter to generate terahertz waves which are transmitted to a sample suspension device to irradiate a suspended to-be-tested sample, and the probe light is directly transmitted to a terahertz detector. The terahertz detector receives the terahertz waves transmitted from the sample suspension device, and then transmits the terahertz waves and the probe light together to a signal processing circuit to obtain a corresponding terahertz time-domain spectrum. By adoption of the terahertz spectrum test device and system, the to-be-tested sample need not be fixed with a clamp or other instruments, so that terahertz waves will not irradiate to the instrument used for fixing the to-be-tested sample during a terahertz spectrum test, which may otherwise affect the test result.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
• G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

Abstract

A fluorescence spectrum testing device and testing method. Said testing device comprises: an excitation light source (1) for generating an ultraviolet light beam and irradiating the ultraviolet light beam on the surface of material (3) to be tested; a rotation module (10) for fixing said material (3), and rotating said material (3) and the excitation light source (1) according to a control instruction inputted by a user; and a detection module (20) for receiving an excited fluorescence light beam generated by said material, and obtaining a corresponding fluorescence spectrum according to the excited fluorescence light beam, the excitation light source (1) and the rotation module (10) being fixedly connected by means of a connection plate (2). The present invention acquires fluorescence spectra of said material (3) at different rotation angles, so as to analyze angle-dependent features of said material (3), solving the problem in the prior art of complicated measurement steps when using the measurement manners including sideband radiation measurement, surface plasma coupling measurement, and dipole moment orientation measurement of OLED materials performed by dyeing molecules in a micro-cavity structure.

IPC Classes  ?

• G01N 21/64 - Fluorescence; Phosphorescence
• G01N 21/01 - Arrangements or apparatus for facilitating the optical investigation

Abstract

Disclosed is a linear voice coil electric motor device, comprising a linear voice coil electric motor (10) and a reverse retroreflector (20). The linear voice coil electric motor (10) comprises a swing assembly (11), an elastic assembly (12), and an upper magnetic element (13) and a lower magnetic element (14), which are vertically arranged in a manner of being spaced apart. The swing assembly (11) comprises a swing base plate (110) located between the upper magnetic element (13) and the lower magnetic element (14), a coil (111) arranged on the swing base plate (110), and a left connecting rod (112) and a right connecting rod (113) respectively connected to the left and right sides of the swing base plate (110). The elastic assembly (12) comprises a first left elastic piece (120) and a second left elastic piece (121), which are both connected to the left connecting rod (112), and a first right elastic piece (122) and a second right elastic piece (123), which are both connected to the right connecting rod (113). By means of additionally providing a set of elastic pieces, the acceleration and deceleration processes of the voice coil electric motor (10) are sped up, such that during the sampling of terahertz waves by a detection pulse, the obtained terahertz wave signals are more real and accurate.

IPC Classes  ?

• H02K 41/035 - DC motors; Unipolar motors

Abstract

The invention belongs to the technical field of OCT and provides an OCT image processing device and system. An FPGA is in communication connection with an upper computer via a PCIE interface to receive OCT image data acquired by the upper computer and to carry out image preprocessing on the OCT image data and then send the OCT image data to the upper computer to display. The OCT image data is acquired and displayed by the upper computer and the OCT image data's preprocessing is implemented by the FPGA, so that the processing efficiency of the OCT image data is greatly improved.

IPC Classes  ?

• A61B 5/00 - Measuring for diagnostic purposes ; Identification of persons
• G06T 7/00 - Image analysis
• G01B 9/02091 - Tomographic interferometers, e.g. based on optical coherence

Abstract

Disclosed is an imaging adjustment device (100). The imaging adjustment device (100) comprises: a scanning driving mechanism (10), an adjustment mechanism (50) connected to the scanning driving mechanism (10), and an imaging platform (90) connected to the adjustment mechanism (50), wherein the scanning driving mechanism (10) comprises a mounting frame (20), a first telescopic assembly (30) connected to the mounting frame (20), and a second telescopic assembly (40) connected to the first telescopic assembly (30); the adjustment mechanism (50) comprises a stand base (60) connected to the second telescopic assembly (40), a vertical adjustment assembly (70) connected to the stand base (60), and a horizontal adjustment assembly (80) connected to the vertical adjustment assembly (70); and the imaging platform (90) is connected to the horizontal adjustment assembly (80). According to the imaging adjustment device (100), the adjustment of the imaging platform (90) in a vertical direction and the adjustment of the levelness are realized by means of providing the vertical adjustment assembly (70) and the horizontal adjustment assembly (80); and a focusing operation can be realized by means of the vertical adjustment assembly (70), and the adjustment of the levelness of a sample can be realized by means of the horizontal adjustment assembly (80), so as to reduce the deviation of the imaging platform (90) during machining and sample mounting, thereby improving the precision of sample information collection.

IPC Classes  ?

• G05D 3/10 - Control of position or direction without using feedback

Abstract

Provided are a direct wave suppression method and system for a microwave imaging system. The method includes a series of filtering operations, such as conversion from a frequency domain to a time domain, filtering, conversion from the time domain to the frequency domain, and cancellation subtraction, on an echo signal set composed of echo signals obtained by a vertical linear array antenna at all the equivalent antenna collection positions thereof.

IPC Classes  ?

• G01S 7/03 - RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - Details of systems according to groups , , of systems according to group - Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
• G01S 7/28 - RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - Details of systems according to groups , , of systems according to group - Details of pulse systems
• G01S 7/40 - Means for monitoring or calibrating
• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging
• G01N 22/00 - Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications

Abstract

An amplitude-phase correction method and system for a microwave imaging system are provided. The method comprises: carrying out data processing, in a range direction, on an echo signal reflected from a target object and acquired by a linear array antenna according to a first pre-set algorithm to obtain a compressed signal in the range direction; extracting a range value corresponding to the maximum amplitude, in the range direction, of the compressed signal in the range direction; carrying out time delay compensation on the echo signal according to the range value to obtain a time-delay-compensated signal; carrying out data processing on the time-delay-compensated signal according to a second pre-set algorithm to obtain an amplitude-phase signal; and carrying out amplitude-phase correction on the echo signal according to the time-delay-compensated signal and the amplitude-phase signal to obtain a corrected echo signal.

IPC Classes  ?

• G01S 7/41 - RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - Details of systems according to groups , , of systems according to group using analysis of echo signal for target characterisation; Target signature; Target cross-section
• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging
• G01S 7/40 - Means for monitoring or calibrating
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications
• G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified

Abstract

A dynamic signal transmission structure based on a hybrid beamforming technology includes a radio-frequency module and an antenna array connected therewith. The radio-frequency module includes one or more radio-frequency link units connected in parallel, the antenna array includes one or more antenna sub-arrays, and each antenna sub-array is connected with one of the radio-frequency modules. The hybrid beamforming technology includes analog and digital beamforming. In this structure, the analog beamforming parameters and the digital beamforming parameters are constant, and the number of radio-frequency link units in the radio-frequency module, the number of antenna sub-arrays in the antenna array, the analog beamforming parameters, and the digital beamforming parameters are in a quantitative relation. The structure of the antenna array and the number of radio-frequency link units in each radio-frequency module can be adjusted dynamically under the condition where the performance is guaranteed, and accordingly, the hardware complexity is reduced.

IPC Classes  ?

• H04B 7/06 - Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Abstract

Disclosed are an optical coherence tomography imaging apparatus based on a digital micro-mirror device and an optical coherence tomography method based on a digital micro-mirror device and using the optical coherence tomography imaging apparatus. The imaging apparatus comprises a broadband light source (1), an optical fiber coupler (3), a reference arm (4), a sample arm, a micro-mirror controller (12), a detector (2), and a computer (11). The optical fiber coupler (3) is used for receiving light emitted by the broadband light source (1) and dividing the light into reference light and sample light, wherein the sample arm comprises a digital micro-mirror device (8) for reflecting the sample light, the digital micro-mirror device (8) is provided with millions of micro reflection mirrors (6), and three-dimensional information of a sample (10) can be obtained after same is scanned by all the reflection mirrors (6). The imaging apparatus is controlled by pure digital signals of the digital micro-mirror device, the scanning error generated by using an optical scanning head is avoided, and the stability and the accuracy of sample scanning-based imaging result are improved. The method utilizing the imaging apparatus is simply controlled and easily operated, and has a high sample imaging efficiency.

IPC Classes  ?

• A61B 5/00 - Measuring for diagnostic purposes ; Identification of persons
• G01B 9/02 - Interferometers

Abstract

A pill coating image processing method and apparatus, and a computer device and a storage medium. By means of receiving an original spectrum uploaded by a pill image detection device (302), using multiple types of filtering windows to carry out filtering processing on the original spectrum (304), carrying out Fourier transform on the filtered spectrum to obtain a pill coating image (306), classifying all pixel points of the pill coating image to obtain an impulse noise point set and a stable pixel point set (308), and carrying out de-noising processing on the impulse noise point set and the stable pixel point set to obtain a de-noised pill coating image (310), multiple types of noise introduced by the original spectrum can be eliminated. By means of carrying out de-noising processing on an impulse noise point set and a stable pixel point set, noise of a pill coating image can be eliminated, thus improving the quality of the pill coating image.

IPC Classes  ?

• G06T 5/00 - Image enhancement or restoration

Abstract

An installation and debugging apparatus and method for a spectrometer (600). The method comprises the following steps: observing spots of the light emitting a collimating lens (620) at different positions, and fixing the position of the collimating lens (620); mutually fixing, according to the angle relation between an entrance slit (611) and a linear array camera (660), a reflective mirror (630) and a diffraction grating (640) at a predetermined angle (0.5 θ); rototably disposing the reflective mirror (630) and the diffraction grating (640) in a housing (610) at the same axis, and rotatably adjusting the reflective mirror (630) and the diffraction grating (640) until the diffracted light corresponding to a detection level of the diffraction grating (640) is converged into the linear array camera (660); installing and debugging a converging lens (650); and determining a wavelength distribution curve of the linear array camera (660). The main part of the collimating light passes through the reflective mirror (630), and then is reflected into the diffraction grating (640), the reflective mirror (630) and the diffraction grating (640) are rotatably adjusted, and the diffracted light corresponding to a detection level of the diffraction grating (640) is converged into the linear array camera (660), so as to avoid repeatedly adjusting the angle of the reflective mirror (630) and the diffraction grating (640) with respect to the entrance slit (611) or the linear array camera (660), improve the installation and debugging efficiency of the spectrometer (600), and efficiently improve the yield thereof.

IPC Classes  ?

• G01N 21/359 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
• G01J 3/42 - Absorption spectrometry; Double-beam spectrometry; Flicker spectrometry; Reflection spectrometry
• G01J 3/02 - Spectrometry; Spectrophotometry; Monochromators; Measuring colours - Details

Abstract

A security check method includes: pre-creating at least four concurrently operating threads, one thread being responsible for movement control and data acquisition, one thread being responsible for imaging processing, one thread being responsible for interface displaying, and one thread being responsible for target detection and recognition; then the four concurrently operating threads divide original echo data of a human body to be checked into data of a plurality of adjacent overlapped azimuthal segments during data processing and perform individual processing on the data of each azimuthal segment. The security check system includes a thread creating unit, a first thread parallel unit, a second thread parallel unit, a third thread parallel unit, a fourth thread parallel unit, and a thread loop control unit. Because subsequent data processing is not required to be performed after the acquisition of all data is completed, the time for a security check process is reduced.

IPC Classes  ?

• A61B 5/0507 - Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves using microwaves or terahertz waves
• G01N 23/04 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by transmitting the radiation through the material and forming images of the material
• G06T 7/70 - Determining position or orientation of objects or cameras
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications

Abstract

A GPU-based human body microwave echo simulation method includes: transmitting emulation input parameters from the memory of a CPU host into the display memory of a GPU device; configuring, at the CPU host, parallel computing network parameters to be run at the GPU device; initiating a kernel function for human body microwave echo simulation preset in the CPU host; computing the kernel function in parallel, in a plurality of processing kernels of the GPU device, in a multi-threaded manner, according to the parallel computing network parameters, to obtain simulation echoes of human body microwaves; transmitting the obtained simulation echoes of human body microwaves from the GPU device back to the CPU host. The method makes full use of the characteristic that a GPU can perform parallel computing to accelerate the echo simulation process, greatly improving the real-time performance of echo simulation of a human body microwave scanning and imaging system.

IPC Classes  ?

• G06N 3/00 - Computing arrangements based on biological models
• G01V 13/00 - Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups
• G01V 8/00 - Prospecting or detecting by optical means
• G01V 8/10 - Detecting, e.g. by using light barriers

Abstract

The present application relates to a phase adjustment device and a system for extracting a terahertz signal. A phase adjustment device, which is characterized in comprising: a phase-locked loop module used for receiving a reference signal so as to output an oscillator signal and a demodulator signal; a frequency dividing module used for receiving the oscillator signal so as to output a phase shift signal and a frequency division signal; and a frequency tracking module used for receiving the demodulator signal so as to output a capture range signal, wherein the phase-locked loop module is further used for receiving the frequency division signal and the capture range signal. The foregoing phase adjustment device may control the operation of the phase-locked loop module by means of the frequency tracking module outputting the capture range signal so that the phase-locked loop module may automatically capture and lock a wide range of terahertz signals, thereby outputting a phase shift signal having high precision and stability.

IPC Classes  ?

• H03L 7/18 - Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop

Abstract

A terahertz oscillation circuit and oscillator based on a resonant tunneling diode, the terahertz oscillation circuit comprising: a first resistor, a first capacitor, a first inductance and a resonant tunneling diode for providing negative resistance, the first resistor being used to provide a bypass shunt, the first capacitor being used to filter parasitic low frequency oscillation signals generated by parasitic resistance and parasitic capacitance in the terahertz oscillation circuit, and the resonant tunneling diode being enabled to work in a negative resistance region by adding a working bias voltage at both ends of the resonant tunneling diode so that the terahertz oscillation circuit continuously oscillates to produce an oscillating signal and drive a load to radiate the oscillating signal outwards, thereby realizing the generation of terahertz radiation while operating at room temperature, and having the characteristics of low power consumption and high stability, which solves the problem of existing terahertz radiation sources needing low-temperature cooling during use due to the large volume thereof and having a relatively short device life, which greatly limits the development and application range of terahertz radiation sources.

IPC Classes  ?

• H04B 1/16 - Circuits
• H01L 29/88 - Tunnel-effect diodes

Abstract

The present solution relates to a preparation method for a resonant-tunneling diode wafer structure, comprising the following steps: providing a substrate; depositing in sequential layers on the substrate a first heavily-doped InGaAs layer, an InP layer, a first AlAs barrier layer, an InGaAs potential well layer, a second AlAs barrier layer, and a second heavily-doped InGaAs layer; depositing a metal pattern on the second heavily-doped InGaAs layer to form a second ohmic contact; on a region outside the metal pattern, first using a first etching liquid able to etch InGaAs material and AlAs material, but not able to etch InP material to etch from the second heavily-doped InGaAs layer to the InP layer, and then using a second etching liquid able to etch InP material, but not able to etch InGaAs material or AlAs material to etch to the first heavily-doped InGaAs layer; and depositing a metal on the etched first heavily-doped InGaAs layer to form a first ohmic contact.

IPC Classes  ?

• H01L 21/329 - Multistep processes for the manufacture of devices of the bipolar type, e.g. diodes, transistors, thyristors the devices comprising one or two electrodes, e.g. diodes
• H01L 21/306 - Chemical or electrical treatment, e.g. electrolytic etching

Abstract

A method for detecting the authenticity of Cordyceps sinensis based on an electromagnetic wave in a terahertz band, comprising: detecting an absorption spectrum of a reference product for an electromagnetic wave in a terahertz band, the absorption spectrum of the reference product being a fingerprint spectrum; detecting an absorption spectrum of a sample to be detected for the electromagnetic wave in the terahertz band, the absorption spectrum of the sample to be detected being a sample spectrum; and comparing the sample spectrum with the fingerprint spectrum to obtain the comparison result, so as to determine, according to the comparison result, whether the sample to be detected is an authentic Cordyceps sinensis product.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

The present invention relates to a method for detecting melamine, comprising: mixing a melamine standard with water to formulate a plurality of melamine solutions of different concentrations; extracting melamine in the milk to be detected, and achieving a constant volume with water to obtain a solution to be detected; obtaining Terahertz absorption spectrums of a plurality of melamine solutions of different concentrations; determining the absorption peak and the absorption peak area of the melamine standard to establish a functional relationship between the concentration of the melamine solution and the absorption peak area; obtaining Terahertz absorption spectrums of the solution to be detected, and comparing same with the absorption spectrums of the melamine standard to determine the absorption peak and the absorption peak area of the melamine in the solution to be detected; and calculating the concentration of the melamine in the milk to be detected according to the absorption peak area of the melamine in the solution to be detected, and the functional relationship between the concentration of the melamine solution and the absorption peak area. Said method for detecting melamine can detect melamine in an aqueous solution by using Terahertz spectrum, and the detection is quick and accurate.

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation
• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

The invention relates to a communication method for terahertz waves carrying optical orbital angular momentum. The method comprises: acquiring at least two terahertz waves carrying optical orbital angular momentum, wherein the at least two terahertz waves carrying the optical orbital angular momentum comprise a first terahertz wave and a second terahertz wave, and the optical orbital angular momentum carried in the first terahertz wave and the optical orbital angular momentum carried in the second terahertz wave are in different modes; modulating the first terahertz wave and the second terahertz wave to obtain a multiplexed beam, wherein the propagation mode of the multiplexed beam is consistent with that of a preset waveguide; and transmitting the multiplexed beam to a receiving end through the preset waveguide. The invention further relates to a communication device for terahertz waves carrying optical orbital angular momentum. For a terahertz communication link carrying optical orbital angular momentum, the above method and device realize channel multiplexing, which can expand the communication capacity of the terahertz communication link, thereby improving the communication efficiency.

IPC Classes  ?

• H04B 10/90 - Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation

Abstract

Provided is a spectrometer, comprising: a collimating element (2) for converting a broadband beam into parallel light; a dispersion device (8) for dispersing the parallel light into a plurality of beams of dispersed light based on the wavelengths thereof; a focusing element (5) for focusing dispersed light with the same wavelength, the focusing element (5) focusing dispersed light with different wavelengths onto different positions in a focal plane, and focal spots of all the dispersed light being arranged along a straight line; and a detecting device (6) performing detection at a plurality of positions in the focal plane, the detecting device being used for detecting multiple types of dispersed light with different preset wavelengths. When an incident angle of the parallel light incident to the dispersion device (8) is fixed, the dispersion device (8) and the focusing element (5) cooperate with each other in such a manner that the focusing positions of the multiple types of dispersed light with different preset wavelengths and the multiple detection positions are in one-to-one correspondence; and the difference between the wave numbers of any two adjacent beams of the dispersed light among the dispersed light with the different preset wavelengths is equal, thereby greatly reducing the number of operations during imaging by means of the spectrometer, saving on the imaging time, and improving the imaging speed.

IPC Classes  ?

• G01J 3/28 - Investigating the spectrum
• G01J 3/02 - Spectrometry; Spectrophotometry; Monochromators; Measuring colours - Details

Abstract

The present invention relates to a laser light source based on the application of OCT spectral analysis. The laser light source comprises: a laser module; a temperature control circuit, connected to the laser module and used for detecting and regulating a temperature value of the laser module in real time; an MCU module, connected to the temperature control circuit and used for controlling, according to the detected temperature value, the temperature control circuit to regulate the temperature value of the laser module, so that the temperature of the laser module keeps constant; a current control circuit, connected to the laser module and used for collecting and regulating a current value of the laser module in real time. The MCU module is connected to the current control circuit and is also used for controlling, according to the collected current value, the current control circuit to regulate the amplitude of a current output to the laser module, so that the current output to the laser module keeps constant. The constant-temperature and constant-current control of a laser module are realized by providing a temperature control circuit and a current control circuit, so that the performance of the laser light source is stable and reliable.

IPC Classes  ?

• H01S 3/102 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
• H01S 3/04 - Arrangements for thermal management
• G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry

Abstract

The present invention relates to the field of infrared communications, and provides a band-stop filter, comprising a filter unit structure. The filter unit structure comprises a first metal layer, a first dielectric layer, and a second metal layer. The first metal layer, the first dielectric layer, and the second metal layer are sequentially stacked. The first metal layer and the second metal layer have the same structure. The metal layer, the dielectric layer, and the metal layer are sequentially stacked to form the filter unit structure, so that the wide filter band of the band-stop filter is realized, and the band-stop filter can be applied to future high-speed communications.

IPC Classes  ?

• H01P 1/203 - Strip line filters

Abstract

A three-dimensional imaging system and method based on rotational scanning is disclosed. The system includes a column-shaped frame with a column-shaped side; a transceiving antenna array element arranged on the column-shaped side that transmits a micro-wave detection signal to a detected object located in the column-shaped frame and receives an echo signal reflected back from the detected object; a signal transceiving device that generates the micro-wave detection signal and sends same to the transceiving antenna array element and processes the echo signal; a rotation control device that controls rotational movement of the transceiving antenna array element so that the transceiving antenna array element transmits the micro-wave detection signal to the detected object in a plurality of angles; and a positioning trigger fixedly arranged on the column-shaped frame and configured to trigger the signal transceiving device when the transceiving antenna array element arrives at a position of the positioning trigger.

IPC Classes  ?

• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications

Abstract

A coating pan monitoring system and monitoring method. The monitoring system comprises a light source, a light splitting device, a probe device, a spectrometer, and a processor. The light source emits initial light; the light splitting device is used to split the initial light into reference light and sample light; the probe device focuses the sample light on a coating inside the coating pan, and probes reflected light reflected by the coating; interference occurs between the reference light and the reflected light, forming interference light; the spectrometer collects and analyzes the interference light to obtain an interference spectrum signal; and the processor processes the interference spectrum signal to obtain coating information data.

IPC Classes  ?

• G01N 21/88 - Investigating the presence of flaws, defects or contamination
• G01B 11/06 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness for measuring thickness

Abstract

An optical coherence tomography system (100), comprising a light source (110), an optical fiber coupler (120), a lens group (130), a signal acquisition device (160), and a signal processing device (170). The light source (110) is used for emitting initial light; the optical fiber coupler (120) is used for performing beam splitting on the initial light to obtain reference light and sample light; the lens group (130) is provided on an optical path between the optical fiber coupler (120) and a sample to be tested (200); the sample light is transmitted to the lens group (130) by means of an optical fiber, then incident to the sample to be tested (200) by means of the lens group (130), and reflected by the sample to be tested (200), thereby obtaining sample reflected light; the sample reflected light passes through the lens group (130) and undergoes interference with the reference light, thereby obtaining interfered light; the lens group (130) is used for lowering the loss of the sample light; the signal acquisition device (160) is used for detecting the interfered light to obtain an interference spectrum; the signal processing device (170) is used for processing the interference spectrum to obtain a structure image of the sample to be tested (200). The optical coherence tomography system (100) can enhance the signal of the interfered light to cause large light intensity in the interference spectrum, so that the obtained structure image of the sample to be tested (200) has a good effect.

IPC Classes  ?

• A61B 5/00 - Measuring for diagnostic purposes ; Identification of persons

Abstract

A resonant tunneling diode wafer structure and a preparation method. The resonant tunneling diode wafer structure comprises a collecting layer, a double potential barrier quantum well structure, and a transmitting layer which are arranged in a stacked manner; the double potential barrier quantum well structure comprises a first AlAs potential barrier layer, a first InGaAs potential well layer, a second InGaAs potential well layer, and a second AlAs potential barrier layer which are arranged in a stacked manner; and an InAs sub potential well layer is provided between the first InGaAs potential well layer and the second InGaAs potential well layer. The first AlAs potential barrier layer is close to the collecting layer, and the second AlAs potential barrier layer is close to the transmitting layer; or the first AlAs potential barrier layer is close to the transmitting layer, and the second AlAs potential barrier layer is close to the collecting layer. Under a same operating bias, the resonant tunneling diode wafer structure achieves migration of more electrons, makes current response greater, and increases a peak-to-valley current ratio.

IPC Classes  ?

• H01L 29/88 - Tunnel-effect diodes
• H01L 29/16 - Semiconductor bodies characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic System in uncombined form
• H01L 29/06 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions

Abstract

A method for wavefront phase modulation of a terahertz wave, comprising: loading a first laser at a preset frequency and a second laser at a preset frequency to a same frequency converter; obtaining an electric field power radiated by the frequency converter; obtaining an effective modulation light intensity of the frequency converter and a terahertz wave to be modulated by means of the electric field power; processing the first laser and the second laser according to the effective modulation light intensity to obtain a phase modulation model of the terahertz wave to be modulated; and introducing the phase modulation model into the terahertz wave beam to be modulated to implement wavefront phase modulation of the terahertz wave to be modulated. According to the present invention, indirect flexible modulation on a wavefront phase of a terahertz wave is achieved by establishing a phase modulation model of a terahertz wave to be modulated by using two laser beams having a frequency difference of a terahertz wave frequency and further transferring the phase modulation model to the terahertz wave beam.

IPC Classes  ?

• G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour

Abstract

A manufacturing method for a terminal structure of a silicon carbide power device, the method comprising: providing a silicon carbide substrate prepared with a main junction; in the silicon carbide substrate, forming a first doped region close to the main junction (S11); in the first doped region, forming a first gradual change region that sequentially increases in ion concentration along the direction away from the main junction (S12); on the basis of the same junction terminal window, simultaneously performing counter ion implantation and forming a second gradual change region that sequentially decreases in ion concentration in the direction away from the main junction on the first gradual change region (S13); the type of the ions doped in the silicon carbide substrate, the first doped region and the first gradual change region is a first conductivity type, and the type of the ions doped in the main junction and the second gradual change region is a second conductivity type. The described method has a simple process, and the terminal structure of the silicon carbide power device prepared by means of the method is less prone to experience electrical field concentration.

IPC Classes  ?

• H01L 29/06 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions
• H01L 29/16 - Semiconductor bodies characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic System in uncombined form

Abstract

A preparation method for an AZO transparent conductive thin film, comprising the following steps: providing a substrate and performing cleaning treatment on the surface of the substrate; providing a zinc oxide seed solution, and depositing the zinc oxide seed solution on the substrate to prepare a zinc oxide seed layer combined on the surface of the substrate; providing a zinc oxide deposition solution, placing the substrate deposited with the zinc oxide seed layer in the zinc oxide deposition solution, and enabling the substrate to be completely immersed in the zinc oxide deposition solution, wherein the surface of the substrate deposited with the zinc oxide seed layer is not adhered to wall; under a heating condition, introducing aluminum ions to the zinc oxide deposition solution continuously and stirring to grow and prepare an AZO pre-fabricated thin film on the surface of the zinc oxide seed layer; and performing ultraviolet radiation treatment on the AZO pre-fabricated thin film to prepare the AZO transparent conductive thin film.

IPC Classes  ?

• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
• H01L 31/0224 - Electrodes

Abstract

The present invention relates to a method for identifying a chiral drug based on a Terahertz time domain spectrometer. The method comprises: preparing a dextroisomer sample, a laevoisomer sample and a mixture sample of a chiral drug; testing absorption spectrums of the dextroisomer sample, the laevoisomer sample, the mixture sample, and a sample to be tested respectively using the Terahertz time domain spectrometer to obtain a dextroisomer absorption spectrum, a laevoisomer absorption spectrum, a mixture absorption spectrum and a tested absorption spectrum respectively; and analyzing the tested absorption spectrum according to the dextroisomer absorption spectrum, the laevoisomer absorption spectrum and the mixture absorption spectrum to identify whether the sample to be tested meets the requirements. According to the method, spectrum absorption information of the sample for Terahertz frequency bands can be obtained and whether the sample to be tested meets the requirements can be known by contrasting absorption spectrums of several standard samples of the chiral drug. Therefore, the described testing method is efficient and accurate for testing a chiral drug.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

An optical coherence tomography system (100), comprising: a light source (110), an optical fiber coupler (120), a reference arm (130), a sample arm (140), a signal collection module (150) and a signal processing module (160). The light source (110) provides initial light; the optical fiber coupler (120) receives the initial light and splits the initial light into multiple paths of output light, wherein the multiple paths of output light comprise one path of reference light and one path of sample light; the reference arm (130) is used for receiving the reference light and transmitting reflected light of the reference light back to the optical fiber coupler (120); the sample arm (140) uses the sample light to detect a sample to be detected (200), wherein the sample light is scattered at the sample to be detected (200) to generate back-scattered light, the back-scattered light is transmitted back to the optical fiber coupler (120), the back-scattered light and the reflected light generate interference in the optical fiber coupler (120) to form interference light, and the interference light is split by the optical fiber coupler (120) into multiple paths of interference spectra; the signal collection module (150) is used for respectively collecting various paths of interference spectra; and the signal processing module (160) generates, according to spectral line signals of various paths of interference spectra, a detection image of the sample to be detected (200) so as to eliminate imaging interference on the sample to be detected (200).

IPC Classes  ?

• A61B 5/00 - Measuring for diagnostic purposes ; Identification of persons
• G01B 9/02 - Interferometers
• G01N 21/45 - Refractivity; Phase-affecting properties, e.g. optical path length using Schlieren methods

Abstract

A TeraHertz wave-based detection method and system for rice. The method comprises: scanning a sample to be detected by using an electromagnetic wave in a TeraHertz frequency band as an incident wave; collecting reflected waves, reflected by the sample to be detected, in the TeraHertz frequency band, and obtaining a reflection spectrum of the reflected waves; and detecting a chalky region of the sample to be detected according to the reflection spectrum. The TeraHertz wave-based detection method and system for rice are based on different light intensities of reflected waves in a chalky region and a non-chalky region, and whether a chalky region exists inside a sample to be detected can be determined according to the reflection spectrum obtained by detecting the reflected waves at different positions.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

A portable security inspection device based on millimetre wave imaging comprising a hand-held body, wherein the hand-held body is provided with a millimetre-wave transmitting circuit for generating a millimetre-wave transmitting signal, a millimetre-wave array antenna for transmitting the millimetre-wave transmitting signal to a detected object and for receiving an echo signal reflected by the detected object, and a millimetre-wave receiving circuit for processing the echo signal and converting the echo signal into image data of the detected object.

IPC Classes  ?

• G01V 8/00 - Prospecting or detecting by optical means
• G01S 13/04 - Systems determining presence of a target
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications
• G01V 3/12 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation operating with electromagnetic waves
• G01V 8/20 - Detecting, e.g. by using light barriers using multiple transmitters or receivers
• G01V 3/00 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
• G01S 7/02 - RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - Details of systems according to groups , , of systems according to group
• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging

Abstract

A method for identifying a naproxen capsule. The method comprises: collecting a terahertz time-domain waveform of a naproxen capsule sample to be tested; acquiring, according to the terahertz time-domain waveform, a terahertz frequency domain spectrum of the naproxen capsule sample to be tested; extracting, according to the terahertz frequency domain spectrum, a characteristic absorption peak of the naproxen capsule sample to be tested; and identifying, according to the characteristic absorption peak, the type of the naproxen capsule to be tested. The method for identifying a naproxen capsule is simple and quick to operate, does not damage the naproxen capsule and can effectively identify the type of the naproxen capsule.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
• G01N 1/28 - Preparing specimens for investigation

Abstract

Disclosed is a blind equalization method. The method comprises: acquiring multiple stages of pre-processing sub-models that are successively iterated; acquiring multiple stages of post-processing sub-models that are successively iterated; processing multiple paths of parallel input signals by using the multiple stages of pre-processing sub-models that are successively iterated, so as to obtain multiple paths of pre-processed data; performing equalization filtering processing on the multiple paths of pre-processed data to obtain multiple paths of equalized data; and processing the multiple paths of equalized data by using the multiple stages of post-processing sub-models that are successively iterated, so as to obtain multiple paths of output signals. Further disclosed is a blind equalization system, a computer device and a readable storage medium. By means of the blind equalization method and system, the computer device and the readable storage medium, when the system processes multiple paths of parallel input signals, the processing by means of various pre-processing sub-models and various post-processsing sub-models has a higher processing speed, but a hardware configuration requirement is lower.

IPC Classes  ?

• H04L 25/03 - Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Abstract

The present invention relates to the field of terahertz communications, and provides a terahertz bandstop filter, comprising a filter unit structure. The filter unit structure comprises a first resonator, a first dielectric layer, a second resonator, a second dielectric layer, and a third resonator. The first resonator comprises a first metal bar, and second metal bars extending from two ends of the first metal bar and be vertical to the first metal bar. The first resonator, the second resonator, and the third resonator have the same structure, and the first dielectric layer and the second dielectric layer have the same structure. According to the present invention, by sequentially using a first resonator, a dielectric layer, a second resonator, a second dielectric layer, and a third resonator to form a filter unit structure, a wide filter band of the terahertz band-pass filter can be realized, and the terahertz band-pass filter is applicable to broadband communication.

IPC Classes  ?

• H01P 1/203 - Strip line filters

Abstract

A drive apparatus of a semiconductor laser, comprising: a drive module (110) that is connected to a semiconductor laser (500), the drive module providing a drive current to the semiconductor laser; a current monitoring module (120) that is used for monitoring, in real time, the drive current and outputting a value of the drive current; a controller (130) that is connected to the current monitoring module, the controller determining, according to the value of the drive current, whether the drive current meets requirements, and controlling the working state of the semiconductor laser according to a determination result. The drive apparatus may prevent a situation in which the semiconductor laser still operates when the drive current does not meet requirements, ensuring that the semiconductor laser always operates when the drive current meets requirements. Which is to say that the semiconductor laser always operates under a stable drive current, which prevents the semiconductor laser from being damaged under an unstable drive current, thereby effectively protecting the semiconductor laser.

IPC Classes  ?

• H01S 5/042 - Electrical excitation

Abstract

The invention relates to a power adjustment method and apparatus, and a human body security check device. An adjustable power attenuator is provided in a millimeter wave signal transmitting link of the millimeter wave transceiver. The method comprises: obtaining a current humidity value by detecting the ambient humidity around the millimeter wave transceiver using a preset humidity sensor; determining a target power attenuation value of the adjustable power attenuator according to the current humidity value, the sum of the target power attenuation value and a power attenuation value caused to a millimeter wave signal by the ambient humidity being a constant value; and controlling the adjustable power attenuator to adjust its power attenuation value to be consistent with the target power attenuation value. The solution can reduce radiation hazard while ensuring the definition of an image.

IPC Classes  ?

• H01Q 3/22 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation in accordance with variation of frequency of radiated wave
• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging
• G01V 8/20 - Detecting, e.g. by using light barriers using multiple transmitters or receivers
• G06F 17/14 - Fourier, Walsh or analogous domain transformations

Abstract

The present invention relates to a terahertz band stop filter unit based on a metamaterial, comprising a first resonator, a first dielectric layer, and a second resonator. The first resonator, the first dielectric layer and the second resonator are in turn arranged in a laminated manner; the first resonator is in a 卍 or 卐-shaped sheet structure, and the second resonator is in a 卍 or 卐-shaped sheet structure; the first resonator and the second resonator have the same structure; the sizes of the first resonator and the second resonator are in scaling proportional relation. The prepared terahertz band stop filter unit is insensitive to the incident direction of electromagnetic waves within the terahertz frequency band range, so that a wide angle incidence is realized and meanwhile an attenuatable or reflexible terahertz frequency band range is widened.

IPC Classes  ?

• H01P 1/20 - Frequency-selective devices, e.g. filters

Abstract

The present invention relates to a metamaterial-based band-pass filter unit. The metamaterial-based band-pass filter unit comprises a first resonator, a first dielectric layer and a second resonator. The first resonator, the first dielectric layer and the second resonator are stacked in sequence. The first resonator is provided with a first rectangular nick in the thickness direction, wherein the first rectangular nick does not exceed an edge position of the first resonator, so as to enable one face where the first dielectric layer abuts the first resonator to be exposed from the first rectangular nick. The second resonator is provided with a second rectangular nick in the thickness direction, wherein the second rectangular nick does not exceed an edge position of the second resonator, so as to enable one face where the first dielectric layer abuts the second resonator to be exposed from the second rectangular nick. The first resonator and the second resonator are completely the same structurally. The band-pass filter unit and the band-pass filter can allow electromagnetic waves in an infrared frequency band range to pass through, while electromagnetic waves outside the infrared frequency band range are all attenuated or reflected. Moreover, the bandwidth of the passable infrared frequency band can reach 195THz, such that wide broadband needed by high-speed communication in the future can be met.

IPC Classes  ?

• H01P 1/203 - Strip line filters

Abstract

The present invention relates to the field of terahertz communication. Provided is a terahertz band-pass filter comprising a filter unit structure, the filter unit structure comprises a first resonator, a dielectric layer and a second resonator which are sequentially laminated. The first resonator comprises a metal plate provided with a hollow pattern, the hollow pattern comprises a first bar shape and a second bar shape extending perpendicularly to the first bar shape from both ends of the first bar shape, and the first resonator and the second resonator have the same structure. The present invention achieves the wide filter band of the terahertz band-pass filter by adopting a first resonator-dielectric layer-second resonator provided with a hollow pattern to form the filter unit structure, and can be applicable to broadband communication.

IPC Classes  ?

• H01P 1/20 - Frequency-selective devices, e.g. filters

Abstract

Provided is a terahertz time-domain spectrometer, comprising: a laser (1); a first light splitter (3), which splits laser light into pump light and detection light; a time delay device (4), which is used for adjusting a time delay of the detection light with respect to the pump light; a second light splitter (8), which is used for splitting the detection light into first detection light and second detection light; a first terahertz antenna (11), which emits a first terahertz wave under the action of the pump light, wherein the first terahertz antenna (11) is also used for detecting a terahertz wave, reflected by a sample to be detected (15), of the first terahertz wave, and the first detection light; a second terahertz antenna (12), which is used for detecting a terahertz wave, transmitted by the sample to be detected (15), of the first terahertz wave, and the second detection light; a first processing module (13), which is used for analyzing a spectral signal detected by the first terahertz antenna (11); and a second processing module (14), which is used for analyzing a spectral signal detected by the second terahertz antenna (12). The terahertz time-domain spectrometer can analyze both a reflection spectrum and a transmission spectrum of a sample to be detected (15), and is convenient to use.

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation
• G01N 21/35 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light

Abstract

A close range microwave imaging method and system is provided. The method comprises: controlling a linear antenna array consisting of a preset number of antennas to rotate along a preset arc trajectory so as to scan a target region; controlling the linear antenna array to acquire a preset number of echo data at azimuthal positions on the arc trajectory and to send an echo data set constituted by the preset number of echo data to a signal processing device until the linear antenna array completes the acquisition of echo data at preset azimuthal positions on the arc trajectory; and controlling, every time the signal processing device receives the echo data set, the signal processing device to perform imaging processing on the echo data set.

IPC Classes  ?

• G01V 3/38 - Processing data, e.g. for analysis, for interpretation or for correction
• G01V 3/12 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation operating with electromagnetic waves
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications
• G01S 13/90 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging using synthetic aperture techniques
• G01S 7/28 - RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - Details of systems according to groups , , of systems according to group - Details of pulse systems
• G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
• G01S 7/00 - RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - Details of systems according to groups , ,

Abstract

A terahertz driving device (200) for driving a terahertz transmitter to produce a terahertz signal. The device comprises: a signal generation module (230) for producing a sine wave signal; a signal conversion module (240) for converting the sine wave signal into a control signal; a correction module (250) for correcting a control signal; and a driving signal generation module (260) for receiving the control signal having passed the correction module (250), and generating a driving signal according to the control signal, so that the driving signal drives a terahertz transmitter to produce a terahertz signal. The terahertz driving device (200) is further provided with a correction module (250). The correction module (250) corrects the control signal so that the control signal meets a pre-set standard. Therefore, the driving signal generated by the driving signal generation module (260) according to the control signal meeting the pre-set standard also meets the pre-set standard, so same can drive the terahertz transmitter to produce a terahertz signal reaching the expected quality, that is, enabling the terahertz signal produced by the terahertz transmitter to be of good quality.

IPC Classes  ?

• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude

Abstract

A terahertz security check method and system may include: a terahertz scanning device collecting a terahertz original image of a human body under test, and sending the same to a central server that identifies the terahertz original image, and determines whether the human body under test carries an article. If so, the image is marked with the position of the article and sent to a monitoring terminal. The monitoring terminal correspondingly marking the position of the article on a pre-stored human body cartoon image, and displaying the terahertz original images before and after marking to monitoring personnel, so that the monitoring personnel determine whether the central server has an identification error; and if so, the monitoring terminal changing a marker on the human body cartoon image, and sending the changed cartoon image to a client of security check personnel for displaying.

IPC Classes  ?

• G06K 9/00 - Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
• G01V 8/26 - Detecting, e.g. by using light barriers using multiple transmitters or receivers using mechanical scanning systems
• G01V 8/10 - Detecting, e.g. by using light barriers
• G01V 8/00 - Prospecting or detecting by optical means
• G01V 8/22 - Detecting, e.g. by using light barriers using multiple transmitters or receivers using reflectors

Abstract

A multi-frequency terahertz detection device, system and method therefor. The detection device comprises: a multi-frequency terahertz transmitting device (1) for transmitting terahertz waves of different frequencies; a scanning device (3) disposed on a transmitting path of the multi-frequency terahertz transmitting device (1) and used for reflecting terahertz waves to a to-be-tested article (10) so as to scan the to-be-tested article (10); an imaging device (7) disposed on a transmission light path of the to-be-tested article (10); a reflecting device (4) disposed on the transmission light path from the to-be-tested article (10) to the imaging device (7) and used for reflecting terahertz waves of different frequencies, transmitted from the to-be-tested article (10), to a power detection device (9) when suspected articles are detected; and a power detection device (9) disposed on a reflecting light path of terahertz waves of different frequencies, transmitted from the to-be-tested article (10).

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation

Abstract

A method and apparatus for detecting the quality of a drug based on electromagnetic waves. The method comprises the following steps: emitting electromagnetic waves in a Terahertz frequency band to a drug to be detected (S110), wherein the electromagnetic waves in a Terahertz frequency band are detection waves; detecting an absorption spectrum of the drug to be detected for the electromagnetic waves, so as to obtain a time-domain detection absorption spectrum of the drug to be detected for the detection waves (S120); performing a Fourier transform on the time-domain detection absorption spectrum to obtain a frequency-domain detection absorption spectrum (S130); and determining whether the chemical composition and dosage of the drug to be detected satisfies standards according to a preset frequency-domain reference absorption spectrum and the frequency-domain detection absorption spectrum (S140). By means of the method and apparatus, whether the quality of a drug to be detected is up to standard can be detected by analyzing a frequency-domain detection absorption spectrum of the drug to be detected for electromagnetic waves in a Terahertz frequency band, and the detection is convenient and quick.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

A drug inspection method and apparatus. The method comprises: emitting electromagnetic waves in a terahertz frequency band towards a sample to be inspected, the electromagnetic waves in the terahertz frequency band being probe waves; obtaining the inspection absorption spectrum of the probe waves for said sample; and determining, according to a preset reference absorption spectrum and the inspection absorption spectrum, whether said sample is a type of drug corresponding to the reference absorption spectrum. The present drug inspection method and apparatus can detect the type of a drug tested by means of analyzing the inspection absorption spectrum of the sample inspected after exposure to electromagnetic waves in a terahertz frequency band. The detection is swift and convenient.

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation

Abstract

The present application relates to a method, apparatus and system for collecting a Terahertz time-domain pulse signal, and a storage medium and a computer device. The method comprises: issuing, according to a received external control message, a delay control instruction for controlling the state of a delay line; when the delay line is in an operating state, acquiring a Terahertz time-domain pulse signal and caching the Terahertz time-domain pulse signal in a preset data buffer queue; when the data buffer queue is in a saturated state, pushing a Terahertz time-domain pulse signal that has already been cached in the current data buffer queue; and returning to the step of caching the Terahertz time-domain pulse signal in a preset data buffer queue. According to the solution of the present application, by importing a collected pulse signal into a preset data buffer queue, and pushing pulse signal data out of the data buffer queue when the data buffer queue is saturated, the problems that a communication duration is long and unequal interval collection may be easily caused when directly pushing collected data are avoided, thereby realizing the quick and reliable collection of data.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

The present invention relates to a terahertz-based method, for use in substance recognition. The method comprises: testing repeatedly at least twice, by terahertz waves, a sample to be tested, to obtain corresponding absorption spectra; smoothing the absorption spectra, and calibrating the peak positions of the absorption spectra; determining, according to the calibrated peak positions of the absorption spectra, a terahertz intrinsic absorption peak position of the sample to be tested; and comparing the determined terahertz intrinsic absorption peak position with data pre-stored in a database, to determine whether the sample to be tested is authentic. According to the method, the operation is simple, a terahertz intrinsic absorption peak is accurately obtained, and no harm is caused to the sample to be tested.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation

Abstract

The present invention relates to a generation device and a generation method of terahertz waves with orbital angular momentum. The generation device comprises a first laser and a second laser; the first laser radiates a first laser beam; the second laser radiates a second laser beam; and the frequency difference between the first laser beam and the second laser beam is within a terahertz wave band. The generation device further comprises an orbital angular momentum generator, a beam combiner and a terahertz radiation generator; the first laser beam passes through the orbital angular momentum generator to generate the first laser beam with the orbital angular momentum; after the first laser beam with the orbital angular momentum and a second laser beam are combined to form a combined beam, the combined beam reaches a terahertz radiation transmitter; the terahertz radiation transmitter performs frequency mixing and filtering processing on the first laser beam A with the orbital angular momentum and the second laser beam B to generate terahertz waves with the orbital angular momentum. Through a simple beam path design, terahertz wave beams with orbital angular momentum, which are low in consumption and high in efficiency, can be obtained.

IPC Classes  ?

• H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
• H01S 5/00 - Semiconductor lasers
• H01S 5/40 - Arrangement of two or more semiconductor lasers, not provided for in groups
• H01S 5/14 - External cavity lasers
• H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
• H01S 3/067 - Fibre lasers
• H01S 3/08 - Construction or shape of optical resonators or components thereof
• H01S 5/065 - Mode locking; Mode suppression; Mode selection

Abstract

An optical delay structure (100) and device. The optical delay structure (100) comprises a first reflective curved surface (110) and a second reflective curved surface (120), which are smoothly connected; the projection of the first reflective curved surface (110) on a set plane is a first curve, and the projection of the second reflective curved surface (120) on the same set plane is a second curve; the first curve and the second curve are smoothly connected, and the set plane is defined as an x-y plane. The first reflective curved surface (110) and the second reflective curved surface (120) satisfy the following: when light is incident on the first reflective curved surface (110) from a first position (xa, ya) outside of the delay structure (100) in a direction parallel to the x-y plane, the light is then reflected by means of the first reflective curved surface (110) onto the second reflective curved surface (120), and is emitted by means of the second reflective curved surface (120) to a second position (xb, yb) outside of the delay structure (100) in a direction parallel to the incident direction. An external drive structure drives the optical delay device to rotate at a constant speed such that the linearity of light delay following time may be obtained by means of the linearity of light delay following angle of rotation.

IPC Classes  ?

• G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
• G02B 26/10 - Scanning systems
• G02B 26/12 - Scanning systems using multifaceted mirrors

Abstract

The present invention relates to a wireless communication method. The method comprises: dividing a space determined by a service scope into a plurality of non-overlapping angular spaces; sending a connection request signal to each angular space in a preset order; receiving response signals from corresponding device nodes of the angular spaces to establish communication links with the device nodes corresponding to the response signals; and carrying out data transmission in corresponding angular spaces according to the communication links and the device nodes corresponding to the response signals. The present invention further relates to a wireless communication device and a storage medium. The device includes a dividing module, a connecting module and a transmitting module. The storage medium stores a computer program that, when executed by a processor, can be used to perform the steps of the method of any of the above-mentioned embodiments. According to the described wireless communication method, device and storage medium, the connection and the data transmission between an access point and the device nodes are both performed in corresponding angular spaces, thereby improving communication efficiency and network throughput.

IPC Classes  ?

• H04B 7/0413 - MIMO systems
• H04B 7/06 - Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Abstract

The present invention relates to a wireless communication device. The wireless communication device comprises a preprocessor, a radio frequency module, and a transmission module. The preprocessor is connected to the radio frequency module and the transmission module in sequence. The preprocessor is used for coding a data stream to generate a coded signal, and performing digital beamforming on the data stream during coding. The radio frequency module receives and processes the coded signal to generate a radio frequency signal and then outputs the radio frequency signal. The frequency of the radio frequency signal is greater than 30 GHz. The transmission module receives the radio frequency signal, performs analog beamforming on the radio frequency signal and then sends said signal to a terminal. Correspondingly, the present invention also relates to a wireless communication method. According to the wireless communication device and method, for the transmission of a data stream, by combining digital beamforming and analog beamforming, and increasing the transmission distance twice, the gain of transmitting waves is improved, and therefore, long-distance communication in millimeter waves or terahertz bands is implemented, and a good communication effect is achieved.

IPC Classes  ?

• H04B 7/06 - Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Abstract

A sample loading assembly (100) for terahertz spectroscopic measurement. The sample loading assembly (100) for terahertz spectroscopic measurement comprises: a support layer (130), a first adsorption layer (110) and a second adsorption layer (120), wherein the support layer (130) is clamped between the first adsorption layer (110) and the second adsorption layer (120), so that a gap of 0.2 mm to 0.5 mm is formed between the first adsorption layer (110) and the second adsorption layer (120), and the first adsorption layer (110) and the second adsorption layer (120) are both nitrocellulose membranes. A test method for a terahertz spectrum, with the sample loading assembly (100) for terahertz spectroscopic measurement being used therein.

IPC Classes  ?

• G01N 21/35 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light

Abstract

The present invention relates to a transflective integrated device, which comprises an emission module, a receiving module, an emission support frame, a receiving support frame, a bearing platform and a base. The emission module is arranged on the emission support frame; the receiving module is arranged on the receiving support frame; the bearing platform is arranged on the base, for holding a sample to be tested; the emission support frame and the receiving support frame can be arranged on the base in a relatively movable manner; the positions of the emission support frame and the receiving support frame are adjusted so that terahertz waves radiated by the emission module can be focused onto the sample, and are reflected or transmitted by the sample and then converged to the receiving module, so as to realize the transmissive and reflective measurement of the sample. In the transflective integrated device, a transmissive mode and a reflective mode are integrated so that the structure of a system is more compact, saving on a certain cost.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

The present invention relates to a wireless communication method. The wireless communication method comprises: sending a request sending signal to a receiving end; transmitting the request sending signal by means of electromagnetic waves in a first frequency band; receiving a response signal from the receiving end; and performing data transmission with the receiving end, response signal and data transmission being performed by means of electromagnetic waves in a second frequency band, and the frequency of the electromagnetic waves in the second frequency band being higher than that of the electromagnetic waves in the first frequency band. The present invention relates to another wireless communication method, comprising: receiving a request sending signal from a sending end; transmitting the request sensing signal by means of electromagnetic waves in a first frequency band; and sending a response signal to the sending end, the response signal and a data signal being transmitted by means of electromagnetic waves in a second frequency band, wherein the frequency of the second frequency band is higher than that of the first frequency band. The present invention further relates to a wireless communication device. By means of the wireless communication methods and device, a sending end can efficiently transmit data to a receiving end.

IPC Classes  ?

• H04B 5/02 - Near-field transmission systems, e.g. inductive loop type using transceiver
• H04W 72/02 - Selection of wireless resources by user or terminal

Abstract

A control method and apparatus for a Fourier transform infrared spectrum analyzer, and a storage medium and a computer device. The method comprises: acquiring a peak value of an infrared signal starting parameter; when a moving mirror and a fixed mirror are perpendicular to each other and the peak value of the infrared signal starting parameter is a preset maximum peak value, obtaining a laser signal starting parameter at this time; acquiring a preset operating scanning frequency of a voice coil electrical motor; acquiring real-time values of temperature and humidity data, a laser signal operating parameter and an infrared signal operating parameter according to the preset operating scanning frequency; comparing the real-time values of temperature and humidity data with preset values thereof; comparing the difference between the laser signal operating parameter and the laser signal starting parameter with a preset difference value; and when the real-time values of temperature and humidity data are equal to the preset values thereof, and the difference between the laser signal operating parameter and the laser signal starting parameter is equal to the preset difference value, outputting the infrared signal operating parameter, such that it can be ensured that the moving mirror and the fixed mirror are perpendicular to each other during operating, and the resolution when the spectral analysis is performed for the output infrared signal operating parameter can be improved.

IPC Classes  ?

• G01N 21/35 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
• G01N 21/01 - Arrangements or apparatus for facilitating the optical investigation
• G05B 19/04 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers

Abstract

Disclosed is an optical structure, comprising a first reflector and a second reflector. The first reflector comprises a first body and a first right-angled portion recessed in the first body. The first right-angled portion comprises a first mirror surface and a second mirror surface facing each other. The second reflector comprises a second body and a second right-angled portion recessed in the second body. The second right-angled portion comprises a third mirror surface and a fourth mirror surface facing each other. The first right-angled portion and the second right-angled portion are oppositely arranged at an interval in a first direction. The first right-angled portion and the second right-angled portion are staggered by a distance in a second direction intersecting with the first direction. Light rays are incident on the first reflector or the second reflector in the first direction. For the optical structure provided by the invention, the optical path can be increased without the need to increase the volume of the optical structure. Further disclosed is a delay device comprising the above-mentioned optical structure.

IPC Classes  ?

• G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
• G02B 17/06 - Catoptric systems, e.g. image erecting and reversing system using mirrors only

Abstract

The present invention relates to an optical fiber micro-heater, comprising: an optical fiber, which is provided with a light exit end surface and which is used for receiving and transmitting an optical signal to the light exit end surface; metal electrodes, which cover an end portion of the optical fiber that is provided with the light exit end surface; a graphene layer, which covers the light exit end surface of the optical fiber which is covered by the metal electrodes. The present invention further relates to a preparation method for an optical fiber micro-heater, comprising: preparing a pair of metal electrodes on an optical fiber tangential to the light exit end surface; providing a metal base that is covered by graphene, and transferring the graphene from the metal base into deionized water to form a graphene thin film; passing the light exit end surface of the optical fiber that is manufactured with metal electrodes through the graphene thin film; extracting and drying the optical fiber that passes through the graphene thin film. The quick transfer of heat may be achieved due to the excellent heat conduction performance of graphene, thus increasing heating efficiency; moreover, the heating of a designated place within a small range may be achieved by the optical fiber micro-heater due to the small size and good flexibility of the optical fiber.

IPC Classes  ?

• H05B 3/14 - Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic

Abstract

A fiber laser comprises a pump source (11), an annular optical path (10), a tuning device, and a current adjustment device. The pump source provides pump light for a resonant optical path. The tuning device is disposed on the annular optical path. The tuning device comprises a graphene film (263) and a first optical fiber (264), and the graphene film covers an end surface of a fiber core at one end of the first optical fiber. The current adjustment device is connected to the graphene film, and the current adjustment device is used to electrify the graphene film and adjust the current passing through the graphene film. By adjusting the current passing through the graphene film, the temperature of the graphene film is adjustable, and the modulation depth of the tuning device with respect to transmitted laser passing through the tuning device is modified, such that the performance of the fiber laser is adjustable. In addition, because the tuning device is an optical fiber device integrated by the first optical fiber and the graphene film, optical signal transmission loss via the tuning device is low, such that tuning performance of the fiber laser is improved.

IPC Classes  ?

• H01S 3/067 - Fibre lasers
• G02F 1/035 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels or Kerr effect in an optical waveguide structure

Abstract

An optical fiber tapering apparatus and method. The optical fiber tapering apparatus comprises: a bottom plate used for providing support; a rotating module provided on the bottom plate and used for rotationally stretching an optical fiber to be processed that is connected to the rotating module; a heating furnace provided on the bottom plate, disposed side by side with the rotating module, and used for heating a portion of the optical fiber to be processed to a molten state in order for stretching; and a heating pipe provided in the heating furnace, and used for the optical fiber to be processed to pass through, so as to fix the optical fiber to be processed and prevent the portion of the optical fiber to be processed that is located in the heating pipe from being oxidized during heating. An optical fiber tapering method based on the optical fiber tapering apparatus comprises the steps of interspersing, placement, winding, ventilation, heating, stretching and the like.

IPC Classes  ?

• C03B 37/15 - Re-forming fibres or filaments with heat application, e.g. for making optical fibres
• G02B 6/287 - Structuring of light guides to shape optical elements with heat application

Abstract

Provided are a whole blood plasma separation system and method. The system comprises: a first blood separation apparatus and a second blood separation apparatus. The first blood separation apparatus comprises a blood collection unit and at least one first micro flow control chip, a micro column array is provided in the first micro flow control chip, and a minimum column interval of the micro column array is greater than or equal to the diameter of an erythrocyte. The second blood separation apparatus comprises a second micro flow control chip, a plasma recovery unit and a waste fluid recovery unit, and a micro flow passage is provided on the second micro flow control chip. The blood collection unit, the at least one first micro flow control chip and the second micro flow control chip are arranged along the flow direction of blood and are successively connected through fluid pipes in a head-to-tail manner; the plasma recovery unit is connected to a plasma outlet of the micro flow passage through a fluid pipe; and the waste fluid recovery unit is connected to a waste fluid outlet of the micro flow passage through a fluid pipe. The solution can realise rapid separation of hemocytes and thrombocytes in a minute amount of blood sample, improving the detection efficiency of the blood sample.

IPC Classes  ?

• G01N 1/40 - Concentrating samples
• G01N 33/49 - Physical analysis of biological material of liquid biological material blood

Abstract

An optical fiber laser, comprising a pumping light source (140), a resonant optical circuit (110), a tuning device (120) and a current adjustment device; the pumping light source provides pumping light for the resonant optical circuit; the tuning device is provided on the resonant optical circuit, and the tuning device comprises a grapheme film (121) and a first optical fiber (122), the grapheme film covering the end face of a fiber core on one end of the first optical fiber; and the current adjustment device is connected to the grapheme film, and the current adjustment device is used for energizing the grapheme film and adjusting the current passing through the grapheme film. On one hand, as the current passing through the grapheme film is adjustable, the temperature of the grapheme film is adjustable, and the depth of modulation performed by the tuning device on the laser transmitted therethrough is changed, making the performance of the optical fiber laser tunable. On the other hand, the tuning device is an optical fiber device integrating the first optical fiber and the grapheme film, and therefore, the loss of an optical signal during transmission of same through the tuning device is small, enabling the optical fiber laser to have a better tuning effect.

IPC Classes  ?

• H01S 3/067 - Fibre lasers
• G02F 1/035 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels or Kerr effect in an optical waveguide structure

Abstract

A safety inspection system and method based on millimeter-wave real-time imaging. The safety inspection system comprises: a conveying device (10), a millimeter wave transceiver module (11), an antenna array (17, 18), a switch array (16a, 16b), a switch control unit (15a, 15b), a quadrature demodulation and data acquisition module (12), and an image display unit (13). By using an Inverse Synthetic Aperture Radar (ISAR) imaging principle, the safety inspection system based on millimeter-wave real-time imaging of the present solution performs real-time imaging on an object to be inspected when the object to be inspected moves, so that not only the imaging speed is improved, but also the field of view is enlarged. A safety inspector can determine whether an inspected person carries dangerous goods by observing a three-dimensional diagram of the body of the inspected person, thereby eliminating the inconvenience caused by back—and-forth movement of a safety inspection device used by the safety inspector on the body of the inspected person.

IPC Classes  ?

• G01V 8/00 - Prospecting or detecting by optical means

Abstract

A plasmon waveguide (10), a biosensor chip (100) and a system. The plasmon waveguide (10) is applied to the biosensor chip (100), and comprises a substrate (11) and a plasmon structure (12) provided on the upper surface of the substrate (11); the plasmon structure (12) comprises a plurality of plasmons (121) periodically arranged, the plasmons (121) being metal split rings, and the annular openings of the plasmons (121) being used for fixing antibody probes (122). The plasmon waveguide (10) is provided in the biosensor chip (100), the target biomolecules flowing into the detection liquid of a microfluidic channel (31) can be captured by means of the antibody probes (122), and the plasmon waveguide (10) is used to enhance the signal strength of terahertz waves emitted to the biosensor chip (100), thereby enhancing the signal strength of the reflected terahertz waves detected by a terahertz analyzer (300), improving the detection sensitivity, the signal-to-noise ratio and the reliability.

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation

Abstract

A ginseng identification method and a system. The method comprises: acquiring terahertz time-domain spectrums of a ginseng sample to be detected and a reference sample (S100); obtaining terahertz frequency-domain spectrums of the ginseng sample and the reference sample according to the terahertz time-domain spectrums (S200); obtaining an absorption coefficient and a refractive index of the ginseng sample according to the terahertz frequency-domain spectrums (S300); and making a terahertz absorption spectrum and a refractive index curve of the ginseng sample according to the absorption coefficient and the refractive index, and determining the kind of the ginseng sample according to the terahertz absorption spectrum and the refractive index curve (S400). The ginseng identification method and the system are simple and quick to operate, cause no damage to ginseng, and are more effective.

IPC Classes  ?

• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

Disclosed is a three-dimensional scanning apparatus used for security scanning, and comprising a scanning mechanism (100) used for scanning and a driving mechanism (200) used for driving the scanning mechanism (100) to rotate, wherein the scanning mechanism (100) comprises a turntable (101) and a probe mounted on the turntable (101) and used for scanning, the driving mechanism (200) comprises a torque output device (201) and a rotating member (202) connected to the torque output device (201), the rotating member (202) is fixedly connected to the turntable (101), the torque output device (201) drives the rotating member (202) to rotate, and the rotating member (202) drives the turntable (101) to rotate.When the three-dimensional scanning apparatus is in operation, the torque output device (201) drives the rotating member (202) to rotate, the rotating member (202) drives the turntable (101) and the probe to rotate, realising three-dimensional scanning, which can improve the reliability of security, and the three-dimensional scanning apparatus has a simple structure.

IPC Classes  ?

• G01V 9/00 - Prospecting or detecting by methods not provided for in groups

Abstract

An all-fiber terahertz time-domain spectrometer, comprising: a fiber laser (1), configured to provide femtosecond laser pulses; an all-fiber transmission module comprising a plurality of transmission fibers, wherein the femtosecond laser pulses can be entirely transmitted in the transmission fibers and a polarization direction of the femtosecond laser pulses can be kept unchanged; a beam splitter (7), configured to split the femtosecond laser pulses, and correspondingly output pump light and probe light through the transmission fibers respectively; a terahertz radiation module, configured to receive the pump light transmitted in the transmission fibers and emit terahertz waves; and a terahertz probe module, configured to receive the probe light transmitted in the transmission fibers and probe the terahertz waves. The all-fiber terahertz time-domain spectrometer can ensure that femtosecond laser pulses emitted by a fiber laser (1) are transmitted in transmission fibers in the whole process, and thus the stability of the spectrometer can be ensured even if an external environment changes.

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation
• G01J 3/433 - Modulation spectrometry; Derivative spectrometry

Abstract

A terahertz near-field imaging probe and a terahertz near-field imaging system. The terahertz near-field imaging probe comprises a Sommerfeld line waveguide end (110) for coupling and transmitting a terahertz wave with radial polarisation, and a probe tip (120) integrally formed with the Sommerfeld line waveguide end (110). The probe tip (120) is used for focusing the terahertz wave at a near field of the probe tip (120) so that the terahertz wave carries information about a sample to be detected and reflects the terahertz wave carrying the information about the sample to be detected to the Sommerfeld line waveguide end (110). The terahertz wave transmitted in the Sommerfeld line waveguide end (110) is referred to as a Sommerfeld wave, has an ultra-large bandwidth (0.1 THz - 5 THz), and has the properties of ultra-low loss and ultra-low chromatic dispersion within the range of the large bandwidth. The probe tip (120) can focus the terahertz wave (the Sommerfeld wave) such that same is extremely small by focusing the Sommerfeld wave freely transmitted at the Sommerfeld line waveguide end (110) at the near field of the probe tip (120), and breaks through a diffraction limit in a near-field range to realise super-resolution imaging.

IPC Classes  ?

• G02B 19/00 - Condensers
• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation
• G01N 21/01 - Arrangements or apparatus for facilitating the optical investigation

Abstract

A terahertz beam splitter, which is a Sommerfeld waveguide of a Y-shaped structure. Three ends of the Y-shaped structure are respectively a terahertz coupling end (10) and two terahertz beam-splitting arms (11 and 12). The terahertz coupling end (10) is used for coupling and transmitting an incident terahertz wave. The two terahertz beam-splitting arms (11 and 12) are two branches branching off from the terahertz coupling end (10), and are used for splitting the incident terahertz wave to form two emergent terahertz waves and transmit same. The terahertz wave is transmitted on the surface of the Sommerfeld waveguide by utilising a surface plasma mode of the Sommerfeld waveguide, and the beam splitting of the terahertz wave is realised by means of the two branches of the Y-shaped structure. The terahertz beam splitter has a simple structure, and has the advantages of a large bandwidth, a low loss and a low chromatic dispersion.

IPC Classes  ?

• G02B 6/125 - Bends, branchings or intersections

Abstract

Disclosed are a direct wave suppression method and system (100) for a microwave imaging system. By means of carrying out a series of filtering operations, such as conversion from a frequency domain to a time domain, filtering, conversion from the time domain to the frequency domain, and cancellation subtraction, on an echo signal set composed of echo signals obtained by a vertical linear array antenna in all the equivalent antenna collection positions thereof, interference caused by a direct wave signal can be effectively suppressed, thus improving the sensitivity of an echo signal receiver, simplifying the subsequent imaging processing process and improving the imaging performance of a microwave imaging system. Thus, an accurate image of a target object can be obtained.

IPC Classes  ?

• G01S 7/36 - Means for anti-jamming

Abstract

Disclosed are an amplitude-phase correction method and system for a microwave imaging system. The amplitude-phase correction method comprises: according to a first pre-set algorithm, carrying out data processing, in the range direction, on an echo signal reflected by a target object and acquired by a linear array antenna to obtain a compressed signal in the range direction (S10); extracting a range value corresponding to the maximum amplitude, in the range direction, of the compressed signal in the range direction (S20); carrying out time delay compensation on the echo signal according to the range value to obtain a time-delay-compensated signal (S30); according to a second pre-set algorithm, carrying out data processing on the time-delay-compensated signal to obtain an amplitude-phase signal (S40); and carrying out amplitude-phase correction on the echo signal according to the time-delay-compensated signal and the amplitude-phase signal to obtain a corrected echo signal (S50). By means of directly carrying out amplitude-phase correction on an echo signal, acquired by a linear array antenna, from a target object, the method does not depend on direct waves, and the difference between directional patterns of channels of the linear array antenna can be better compensated for.

IPC Classes  ?

• G01S 7/40 - Means for monitoring or calibrating
• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging
• G01S 13/88 - Radar or analogous systems, specially adapted for specific applications

Abstract

An online tube wall thickness monitoring instrument, system and method. The online tube wall thickness monitoring instrument comprises a terahertz generation apparatus and a terahertz receiving apparatus. The terahertz generation apparatus is used for producing terahertz detection waves and transmitting same to a tube wall (30) to be monitored, and the terahertz receiving apparatus is used for receiving the terahertz detection waves passing through the tube wall (30) to be monitored, so as to acquire the thickness of the tube wall (30) to be monitored according to an attenuation occurring to the terahertz detection waves after passing through the tube wall (30) to be monitored. During the detection of the thickness of the tube wall (30), the terahertz generation apparatus arranged therein emits the terahertz detection waves and enables same to be incident on the tube wall (30) to be monitored, and the terahertz detection waves attenuate when passing through the tube wall (30) to be monitored. The terahertz receiving apparatus detects a change in the terahertz detection waves, and thus can obtain the thickness of the tube wall (30) to be monitored. The online tube wall thickness monitoring instrument can realise the rapid and accurate detection of the thickness of a tube wall without the need to make contact with the tube wall.

IPC Classes  ?

• G01B 11/06 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness for measuring thickness

Abstract

The present invention relates to a terahertz digital communication system and method based on polarization coding. The system respectively controls two pulse terahertz sources according to a digital signal to be transmitted; the two pulse terahertz sources respectively generate pulse signals at the moment when signals are 0 and 1, and then respectively form the two signals into linear polarization signals by means of a polarization unit, the polarization directions being orthogonal; the two linear polarization signals are synthesized by a polarization beam splitter into one signal and are then transmitted; after a receiving end receives the signal, the signal is restored to two signals by means of the polarization beam splitter; and then, the signal 0 and the signal 1 are respectively demodulated by a terahertz detector to complete data transmission. The present invention has the advantages of not occupying a bandwidth resource, direct and fast modulation and simple implementation, and is a new supplement to an existing terahertz communication scheme. The rate of communication is determined by the rate of a pulse terahertz source, the pulse instantaneous energy of the pulse terahertz source is high, the power can be made relatively large, and the anti-fading capability is stronger than that of a continuous wave.

IPC Classes  ?

• H04B 10/40 - Transceivers

Abstract

Disclosed are a three-dimensional imaging system and method based on rotational scanning. The system comprises: a column-shaped frame (10) with a column-shaped side face; a transceiving antenna array element (11) arranged on the column-shaped side face and used for transmitting a micro-wave detection signal to a detected object (20) located in the column-shaped frame (10) and receiving an echo signal reflected back from the detected object (20); a signal transceiving module (12) for generating the micro-wave detection signal and sending same to the transceiving antenna array element (11) and processing the echo signal; a rotation control module (13) for controlling rotational movement of the transceiving antenna array element (11) along the column-shaped side face so that the transceiving antenna array element (11) transmits the micro-wave detection signal to the detected object (20) from a plurality of angles; and a positioning trigger (31) fixedly arranged on the column-shaped frame (10) and used for triggering, when the transceiving antenna array element (11) moves to the position of the positioning trigger (31), the signal transceiving module (12).

IPC Classes  ?

• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging

Abstract

Disclosed are an FPGA-based grating subdivision device and method. The device comprises: a differential amplification module (110), a comparison module (120), a logic gate module (130), and a processing module (140), wherein the processing module (140) is an FPGA operation module. Employing only simple peripheral circuits, the differential amplification module (110), comparison module (120) and logic gate module (130), four sinusoidal signals of moiré patterns can be converted into a first digital pulse signal (A3), second digital pulse signal (B3) or third digital pulse signal (C1) identifiable to the FPGA operation module, reducing the demands on additional hardware and saving costs. In addition, the FPGA operation module can realize subdivision, using a target multiplier (a large multiplier), of the first digital pulse signal (A3), second digital pulse signal (B3) or third digital pulse signal (C1), and the FPGA operation module has high primary frequency and strong interference resistance.

IPC Classes  ?

• G01B 11/00 - Measuring arrangements characterised by the use of optical techniques

Abstract

A security check method and system based on microwave imaging of human bodies. The security check method comprises: pre-create at least four parallelly operating threads, one thread being responsible for movement control and data acquisition, one thread being responsible for imaging processing, one thread being responsible for interface displaying, and one thread being responsible for target detection and recognition (S201); then the four concurrently operating threads divide original echo data of a human body to be checked into data of a plurality of adjacent overlapped azimuthal segments during data processing and perform individual processing on the data of each azimuthal segment. The security check system comprises a thread creating unit (1), a first thread parallel unit (2), a second thread parallel unit (3), a third thread parallel unit (4), a fourth thread parallel unit (5), and a thread loop control unit (6). Because subsequent data processing is not required to be performed after the acquisition of all data is completed, the period of time for a security check process is reduced.

IPC Classes  ?

• G01V 3/12 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation operating with electromagnetic waves

Abstract

Provided in the solution are a device for monitoring a quantum key distribution light source and a monitoring method thereof. The device comprises adjustable attenuators respectively arranged on a light path of each of polarized light sources and connected to the polarized light sources, beam splitters connected to the adjustable attenuators, and power detection ports connected to the beam splitters, wherein the beam splitters are used for separating a beam from light signals output by the polarized light sources for monitoring the light sources; the power detection ports are used for converting the light signals to analog electrical signals and calculating the power of the analog electrical signals; and the adjustable attenuators are used for a user to adjust attenuation of the light signals output by the polarized light sources according to the power of the analog signals so as to control the polarized light sources in real time. The solution can accurately distinguish which light sources in four polarization directions the jitter of the light sources comes from, and can feed back and adjust attenuation of the jittering light sources in real time to prevent interruption of quantum key distribution caused by jitter of the light source on any path, thereby improving the efficiency of key distribution.

IPC Classes  ?

• H04L 9/08 - Key distribution
• H04B 10/70 - Photonic quantum communication

Abstract

A voice coil electric motor (30) control method and system, and a controller (10). The voice coil electric motor (30) is electrically connected to a drive circuit (20) and is mechanically connected to a displacement sensor (40), and the drive circuit (20) and the displacement sensor (40) are both electrically connected to the controller (10). By means of using a digital signal to perform closed-loop control on a voice coil electric motor (30), interference from electromagnetic reflection and mechanical vibration of the voice coil electric motor (30) can be avoided, such that the reliability is high and a peripheral circuit is simple.

IPC Classes  ?

• H02P 25/034 - Voice coil motors
• H02P 7/025 - Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type the DC motors being of the moving coil type, e.g. voice coil motors

Abstract

A terahertz experiment environment monitoring system comprising a temperature control circuit (10), a gas pressure detection circuit (20), a humidity detection circuit (30), and a master controller (40). By combining the temperature control circuit (10) and the master controller (40), real-time capturing, regulation, and control of temperature information of a terahertz experiment box are allowed, the temperature can be kept in an isothermal state; also, by combining the gas pressure detection circuit (20), a gas valve (60), and the master controller (40), the pressure of nitrogen gas in the terahertz experiment box is captured in real-time, regulated and controlled, and the pressure is kept constant; also, by detecting the relative humidity of the interior of the box via the humidity detection circuit (30) and by combining the temperature control circuit (10) and the gas valve (60), the humidity of the terahertz experiment box is ensured. The system can detect in real-time the temperature information, gas pressure information, and humidity information of the interior of the terahertz experiment box and also keeps the temperature information, the gas pressure information, and the humidity information in standard states, thus ensuring the accuracy of environmental parameters of the terahertz experiment box.

IPC Classes  ?

• G05D 27/02 - Simultaneous control of variables covered by two or more of main groups characterised by the use of electric means

Abstract

A close range microwave imaging method and system, the method comprising: controlling a linear antenna array consisting of a preset number of antennas to rotate along a preset arc trajectory so as to scan a target region; controlling the linear antenna array to acquire a preset number of pieces of echo data at azimuthal positions on the arc trajectory and to send echo data sets constituted by the preset number of pieces of echo data to a signal processing device until the linear antenna array completes the acquisition of echo data at preset azimuthal positions on the arc trajectory; and controlling, every time the signal processing device receives an echo data set, the signal processing device to perform imaging processing on the echo data set. The present invention is able to effectively improve the processing speed of close range microwave imaging, reduce the processing time, and implement real-time imaging.

IPC Classes  ?

• G01V 3/12 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation operating with electromagnetic waves

Abstract

A terahertz time-domain reflectometry system, for use in detecting a fault in a semiconductor integrator circuit, comprising a pulsed laser (10), a beam splitting device (20), an optical delay line device (40), and an electric pulse transceiver (50). An ultra-short pulsed laser excites the electric pulse transceiver (50) to produce and receive a high-frequency electric pulse signal, the frequency of the high-frequency electric pulse signal being in the picosecond order of magnitude, and the high-frequency electric pulse signal is a current signal. The high-frequency electric pulse signal produced is introduced into a chip to be tested (60) for fault detection. By means of the terahertz time-domain reflectometry system, a change in a terahertz time-domain reflected signal of the test chip (60) within a certain time delay can be acquired rapidly, that is, information on the distance over which the high-frequency electric pulse signal propagated along a lead in the test chip (60) can be acquired, a connectivity fault in the test chip (60) can be located and determined on the basis of the change in the terahertz time-domain reflected signal, and the resistance of the lead in the test chip (60) can also be measured.

IPC Classes  ?

• G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods
• G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
• G01R 31/28 - Testing of electronic circuits, e.g. by signal tracer

Abstract

Provided is a remote terahertz communication system, comprising a terahertz emitting device and a terahertz receiving device. The terahertz emitting device comprises a terahertz emitter, a first high-gain directive antenna, a first laser emitting module, a first laser receiving module, a first light path adjusting module and a first control module. The terahertz receiving device comprises a terahertz receiver, a second high-gain directive antenna, a second laser emitting module, a second laser receiving module, a second light path adjusting module and a second control module. The first control module is connected to the first laser receiving module and the first light path adjusting module. The second control module is connected to the second laser receiving module and the second light path adjusting module. The present application uses an identifiable coloured laser signal as a signal marker, so as to realize the real-time alignment of a high-gain directive antenna of a terahertz emitting device and a high-gain directive antenna of a terahertz receiving device, which can effectively guarantee the real-time smooth operation of a communication link of the remote terahertz communication system.

IPC Classes  ?

• H04B 10/50 - Transmitters
• H04B 10/67 - Optical arrangements in the receiver
• H04B 10/70 - Photonic quantum communication

Abstract

A GPU-based human body microwave echo simulation method and system. The method comprises: transmitting emulation input parameters from the memory of a central processing unit (CPU) host end (1) into the video memory of a graphics processing unit (GPU) device end (2) (S301); configuring, at the CPU host end (1), parallel computing network parameters running at the GPU device end (2) (S302); initiating a kernel function for human body microwave echo simulation preset within the CPU host end (1) (S303); the kernel function computing simulation echoes of human body microwaves in parallel, in a plurality of processing kernels of the GPU device end (2), in a multi-threaded manner, according to the parallel computing network parameters (S304); the GPU device end (2) transmitting the computed simulation echoes of human body microwaves back to the CPU host end (1) (S305). The present solution can make full use of the characteristic that a GPU can perform parallel computing to accelerate the echo simulation process, greatly improving the real-time performance of echo simulation of a human body microwave scanning and imaging system.

IPC Classes  ?

• G01V 13/00 - Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups

Abstract

A terahertz full-polarization-state detection spectrograph, comprising a terahertz wave generator (10), a polarizer (11), a polarizing beam-splitting sheet (12), a horizontal terahertz detector (13), and a vertical terahertz detector (14). The terahertz wave generator (10) generates a terahertz wave and the purity of the terahertz wave is optimized by the polarizer (11); a measured object modulates the terahertz wave the purity of which is optimized to obtain a terahertz modulated wave; the polarizing beam-splitting sheet (12) decomposes the terahertz modulated wave into a horizontal terahertz wave and a vertical terahertz wave which are vertical to each other in a polarization state; the two corresponding terahertz detectors (13, 14) are used for measuring the two terahertz waves respectively, and then the characteristics of a measured sample (50) are analyzed according to the measurement result. The terahertz full-polarization-state detection spectrograph can quickly measure full-polarization-state terahertz waves accurately, thereby improving the measurement precision and measurement efficiency of the measured sample (50).

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation
• G01N 21/3586 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]

Abstract

A terahertz full-polarization-state detection spectrograph, comprising a terahertz wave generator (10), a polarizer (11), a polarizing beam-splitting sheet (12), a horizontal terahertz detector (13), and a vertical terahertz detector (14). The terahertz wave generator (10) produces a terahertz wave, and the purity of the terahertz wave is optimized by the polarizer (11); a detected sample (50) modulates the terahertz wave, the purity of which is optimized, to obtain a terahertz modulated wave; the polarizing beam-splitting sheet (12) decomposes the terahertz modulated wave into a horizontal terahertz wave and a vertical terahertz wave which are vertical to each other in a polarization state; the two corresponding terahertz detectors (13, 14) are used for detecting the two terahertz waves respectively, and then the characteristics of the detected sample (50) are analyzed according to the detection result. The terahertz full-polarization-state detection spectrograph can quickly detect full-polarization-state terahertz waves accurately, thereby improving the detection precision and detection efficiency of the detected sample (50).

IPC Classes  ?

• G01N 21/3581 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using Terahertz radiation

Abstract

A terahertz metamaterial waveguide and device. The terahertz metamaterial waveguide comprises a subwavelength substrate layer (10) and a metal layer (20). One surface of the subwavelength substrate layer (10) is plated with the metal layer (20), and a plurality of periodically-distributed micropores (21) is formed in the metal layer (20). By using the subwavelength substrate layer (10) and plating the surface of the subwavelength substrate layer (10) with the metal layer (20), in which the plurality of periodically-distributed micropores is formed, the thickness of the terahertz waveguide and the transmission loss of terahertz waves transmitted in the terahertz waveguide can be reduced, and manufacturing costs are lowered.

IPC Classes  ?

• G02B 1/00 - Optical elements characterised by the material of which they are made; Optical coatings for optical elements

Abstract

A millimeter wave image based human body foreign object detection method, comprising: acquiring a millimeter wave gray scale image of a human body (S110); according to a pre-determined foreign object imaging characteristic, extracting from the millimeter wave gray scale image a foreign object area image (S120); according to a pre-determined foreign object image recognition algorithm, performing calculations on the foreign object area image, and acquiring a foreign object image from the foreign object area image (S130); displaying the foreign object image as a foreign object detection result (S140). Also provided is a millimeter wave image-based human body foreign object detection system.

IPC Classes  ?

• G01V 8/00 - Prospecting or detecting by optical means

Abstract

A method for measuring parameters of a terahertz beam, comprising: obtaining a terahertz beam to be measured (S110); controlling a mask (12) to move in a focal plane of the terahertz beam and measuring the waist spot radius of the terahertz beam in the focal plane (S120); controlling the mask (12) to move from the focal plane of the terahertz beam to the propagation direction of the terahertz beam, recording a corresponding axis movement amount each time when the mask (12) moves, and measuring, at the axis movement amount, the radius of the terahertz beam in the plane where the mask (12) is located (S130); and calculating the focus depth when the radius of the terahertz beam measured at the axis movement amount is equal to (I) times as the waist spot radius (S140). According to the simple method for measuring parameters of a terahertz beam, the focus waist spot radius and the focus depth that affect the spatial resolution of terahertz spectral imaging can be quickly and conveniently measured. The measured waist spot radius and focus depth are high in precision and small in errors.

IPC Classes  ?

• G01J 11/00 - Measuring the characteristics of individual optical pulses or of optical pulse trains

Abstract

A structure for testing a lock-in amplifier (300). A test signal generating device (100) of the structure comprises: a signal source module (120) used for generating a pure signal; a noise module (140) used for generating noise; an addition circuit (160) having two input ends connected respectively to the signal source module (120) and to the noise module (140) and used for superimposing the pure signal and the noise to produce a test signal for inputting into the lock-in amplifier (300); a first switch (K1) is provided on a branch connecting the signal source module (120) and the addition circuit (160), and a second switch (K2) is provided on a branch connecting the noise module (140) and the addition circuit (160). The structure for testing the lock-in amplifier (300), by controlling the switches, allows the test signal to be either pure noise or an aliased signal, thus testing the noise resistance capability of the lock-in amplifier (300) in different noise frequency band ranges and amplitude ranges, producing a noise distribution state of reference signals of nearby frequencies, and at the same time testing other parameters of the lock-in amplifier (300).

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

A delay line device (10), and a terahertz time-domain spectrometer system. The delay line device (10) comprises a bottom plate (110) and a slide rail assembly (120). The slide rail assembly (120) comprises a slide block (121), a reflector (140), a grating scale assembly (130), and an electromagnetic induction assembly (150). When a current passes through the electromagnetic induction assembly (150), the electromagnetic induction assembly (150) cuts a magnetic induction coil (151) to generate power to push the slide block (121) to move. The grating scale assembly (130) provided on the slide rail assembly (120) acquires displacement information of the slide block (121) when the slide block (121) moves. The movement of the slide block (121) drives the reflector (140) provided on the slide block (121) to move, so that the optical path of pump light can be changed, thus generating a delay between the pump light and detection light. The delay line device (10) employs the electromagnetic induction assembly (150) to provide power for driving the slide block (121) to move, so that quick scanning can be implemented. Moreover, the grating scale assembly (130) is employed to acquire displacement information of the slide block (121) when the slide block (121) moves. Therefore, high precision, high stability, fast response, and strong anti-interference ability are achieved. In addition, a module integration assembly mode is employed for the delay line device (10). Thus, the structure of the delay line device (10) is compact and space can be saved, facilitating structural miniaturization.

IPC Classes  ?

• G01J 3/02 - Spectrometry; Spectrophotometry; Monochromators; Measuring colours - Details

Abstract

The present invention relates to an electrically scanned array antenna device applied to a millimeter wave imaging system. The electrically scanned array antenna device comprises an adjustable light source for outputting an optical signal with an adjustable wavelength; an electro-optical modulation module; an optical coupler; a time delay module for performing optical delay of different durations on each modulated signal, and correspondingly changing the duration of the optical delay according to the wavelength of the optical signal to obtain modulated signals of different phases; an optical detector; and an array antenna. The millimeter wave is loaded on the optical signal with an adjustable wavelength to obtain a modulated signal; the modulated signal is divided into multiple signals; time delay of different durations is performed on each signal; and millimeter wave signals of different phases are obtained after demodulation and are simultaneously transmitted to scan an object to be measured In this solution, the measured object can be quickly scanned. It is unnecessary for the measured object to move with relative to the millimeter wave array antenna to realize complete scanning. The structure of same is simple, and same is convenient to use.

IPC Classes  ?

• H01Q 3/26 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the distribution of energy across a radiating aperture
• H01Q 21/00 - Antenna arrays or systems
• H04B 10/2575 - Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier

Abstract

A power adjustment method and apparatus, and a human body security check device. The method is applied in a human body security check device or an inspection device provided with a millimeter wave transceiver (302). An adjustable power attenuator (3013) is provided in a millimeter wave signal transmitting link of the millimeter wave transceiver (302). The method comprises: obtaining a current humidity value by detecting the ambient humidity around the millimeter wave transceiver (302) using a preset humidity sensor (3011); determining a target power attenuation value of the adjustable power attenuator (3013) according to the current humidity value, the sum of the target power attenuation value and a power attenuation value caused to a millimeter wave signal by the ambient humidity being a constant value; and controlling the adjustable power attenuator (3013) to adjust its power attenuation value to be consistent with the target power attenuation value. The solution can reduce radiation hazard while ensuring the definition of an imaged image.

IPC Classes  ?

• G01V 8/20 - Detecting, e.g. by using light barriers using multiple transmitters or receivers

Abstract

Disclosed are a terahertz security check method and system. The method comprises: a terahertz scanning device collecting a terahertz original image of a human body under test, and sending same to a central server; the central server identifying the terahertz original image, and determining whether the human body under test carries an article, and if so, marking the position of the article, and sending terahertz original images before and after marking to a monitoring terminal; the monitoring terminal correspondingly marking, according to the terahertz original image after marking, the position of the article on a pre-stored human body cartoon image, and displaying the terahertz original images before and after marking to monitoring personnel, so that the monitoring personnel determine whether the central server has an identification error; and if so, the monitoring terminal changing, according to an instruction input by the monitoring personnel, a marker on the human body cartoon image, and sending the changed cartoon image to a client of security check personnel and displaying same. The method can improve the accuracy of image identification in security check and prevent the conditions of missing check and false check.

IPC Classes  ?

• G01V 8/10 - Detecting, e.g. by using light barriers