Abstract

An underwater wireless charging method and device using acoustic waves for covering the entire depth of sea is disclosed. Within 10 meters below the water-level, unmanned undersea vehicles (UUV) are charged from a mother ship . Between 10 meters and 100 meters below the water-level, a sound wave is directly sent from the mother ship to the underwater sensor to be charged. At the depth of more than 100 meters below the water-level, an underwater UUV is adopted to in situ charge the underwater sensor node at close range. The transmitting transducer converts electrical energy to sound energy through the inverse piezoelectric effect. The sound wave is then sent by the transducer to a hydrophone that transforms sound energy to electrical energy via the piezoelectric effect. The load can thus be charged. Three types of wireless charging can be realized by the station for different underwater application scenarios, so as to satisfy the wireless charging for covering the entire depth of sea.

IPC Classes  ?

• H02J 50/15 - Circuit arrangements or systems for wireless supply or distribution of electric power using ultrasonic waves
• B63G 8/00 - Underwater vessels, e.g. submarines
• B60L 53/10 - Methods of charging batteries, specially adapted for electric vehiclesCharging stations or on-board charging equipment thereforExchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle

Abstract

A high-power high-frequency directional transmission underwater acoustic transducer and a manufacturing method therefor. The transmission underwater acoustic transducer comprises a piezoelectric composite, electrodes, a matching layer, a heat dissipation structure, and an acoustic backing; the piezoelectric composite is a 1-1-3 type piezoelectric composite and consists of a piezoelectric phase, a passive phase and a structural phase, the piezoelectric phase is an array of piezoelectric material columns, the structural phase is a rigid material frame between the piezoelectric material columns, and the passive phase is a flexible polymer between the piezoelectric phase and the structural phase; the heat dissipation structure is a rigid material frame having the same structural phase as that of the piezoelectric composite; and the acoustic backing is distributed in the heat dissipation structure. A piezoelectric material having low loss and high pressure resistance and a 1-1-3 type piezoelectric composite structure are used to design the transmission transducer having the characteristics of high frequency, high directivity, high power, low loss and fast heat dissipation, achieving continuous transmission of directional energy through sound waves within a distance of 10 m in a marine environment.

IPC Classes  ?

• B06B 1/06 - Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction

Abstract

An acoustic wave-based full-sea-depth-covering undersea wireless charging method and device. In said method, within 10 m below a water surface, a UUV is charged in a UUV-mother ship accompanying mode; within a range of 10 m to 100 m below the water surface, the mother ship directly transmits acoustic waves to an undersea sensor node for charging; and within a range of more than 100 m below the water surface, a UUV submerged into the seafloor is used to provide in-situ short-distance charging for a seafloor undersea sensor node. A transmitting transducer converts electric energy into acoustic energy by means of an inverse piezoelectric effect; and a hydrophone receives acoustic waves transmitted by the transmitting transducer, converts acoustic energy into electric energy by means of a piezoelectric effect, and charges a load by means of a matching circuit. A high-frequency hydroacoustic transmitting transducer and a high-sensitivity hydrophone are applied to form an undersea wireless charging device. Three wireless charging modes are designed for different undersea application scenarios, which can satisfy wireless charging in full-sea-depth working conditions.

IPC Classes  ?

• H02J 7/32 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover
• H02J 50/15 - Circuit arrangements or systems for wireless supply or distribution of electric power using ultrasonic waves

Abstract

A shear vibration-based piezoelectric composite material and a preparation method thereof are disclosed. The piezoelectric composite material includes a piezoelectric material and the passive material. The piezoelectric material includes a piezoelectric material polarized along the x-axis positive and a piezoelectric material negatively polarized along the x-axis. The piezoelectric materials in the two polarization directions are alternately arranged along the x-axis direction. The passive material includes a filling layer, a transition layer, and a planar layer. The filling layer is disposed between every two adjacent piezoelectric materials. The planar layer is located outer two surfaces perpendicular to the z-axis of the piezoelectric material. The planar layer on one side is fixedly connected to the filling layer in the odd-numbered position via the transition layer. The planar layer on the other side is fixedly connected to the filling layer in the even-numbered position via the transition layer. The piezoelectric composite material can be used to prepare an underwater acoustic transducer, a hydrophone, piezoelectric energy harvesters, and the like. The invention innovatively converts shear vibrations into the thickness vibrations of the upper and lower surfaces of the composite material, thereby improving the performance of the composite material.

IPC Classes  ?

• H01L 41/257 - Treating devices or parts thereof to modify a piezo-electric or electrostrictive property, e.g. polarisation characteristics, vibration characteristics or mode tuning by polarising
• H01L 41/27 - Manufacturing multilayered piezo-electric or electrostrictive devices or parts thereof, e.g. by stacking piezo-electric bodies and electrodes
• H01L 41/18 - Selection of materials for piezo-electric or electrostrictive elements

Abstract

A shear vibration-based piezoelectric composite material and a preparation method therefor. The piezoelectric composite material comprises piezoelectric materials (1) and a passive material (2); the piezoelectric materials comprise a piezoelectric material which is positively polarized along an X axis and a piezoelectric material which is negatively polarized along the X axis; the piezoelectric materials in two polarization directions are alternately arranged along the X axis; the passive material comprises a filling layer (2a), a transitional layer (2b), and a planar layer (2c); the filling layer is provided between every two adjacent piezoelectric materials; the planar layer is located outside two surfaces, perpendicular to a Z axis, of the piezoelectric materials, wherein the planar layer on one side is fixedly connected with the filling layer in odd-number positions by means of the transitional layer, and the planar layer on the other side is fixedly connected with the filling layer in even-number positions by means of the transitional layer. The piezoelectric composite material can be used for preparing an underwater acoustic transducer, a hydrophone and a piezoelectric energy harvester and the like; and shear vibration is creatively converted into thickness vibration on the upper and lower surfaces of the composite material, so that the performance of the composite material is improved.

IPC Classes  ?

• H01L 41/18 - Selection of materials for piezo-electric or electrostrictive elements
• H01L 41/37 - Composite materials

Abstract

A digital global sharing platform for preserving Dongba ancient texts comprises a collection mechanism, a Dongba ancient pictograph interpretive library, a global memory engineering database, a platform management module, and information transmission module. The collection mechanism transmits, to the Dongba ancient pictograph interpretive library, various Dongba ancient text information. The Dongba ancient pictograph interpretive library and the global memory engineering database exchange information with each other. The platform management module performs, for the Dongba ancient pictograph interpretive library, registration and identity management, usage permission management, storage management, security management, and query management. The Dongba ancient pictograph interpretive library transmits via the information transmission module to outside a processed Dongba pictograph. The solution can provide resources and create favorable conditions for studying Dongba classics in a global system.

IPC Classes  ?

• G06F 17/30 - Information retrieval; Database structures therefor

Abstract

The invention discloses a method of establishing a digital Dongba ancient text interpretive library, the method comprising the following steps: collecting available Donba ancient text data, and establishing a Dongba ancient text interpretive data bank comprising a graphical template library, an audio template library, and a video template library; establishing, according to the Dongba ancient text interpretive data bank, a Dongba ancient text interpretive library comprising a word meaning database, a sentence meaning database, and an event database; establishing a Dongba ancient text interpretive knowledge base to perform management of the interpretive database, including: employing the Dongba ancient text interpretive knowledge base to merge, according to an interpretation rule, the three databases, and employing a logic engine to facilitate merging of the word meaning database, the sentence meaning database, and the event database in the interpretive database; establishing a Dongba ancient text interpretive optimization base, and mining, via a knowledge mining tool and in a frequency mode, content of the interpretive database and the interpretive knowledge base, and performing a cluster analysis on the same. The embodiment supports optimization and update of the interpretation rule of the interpretive database and the interpretive knowledge base.

IPC Classes  ?

• G06F 17/30 - Information retrieval; Database structures therefor

Abstract

A fiber grating demodulation system for enhancing spectral resolution by finely adjusting a light splitting grating, includes a laser pump source, a wavelength division multiplexer, a fiber Bragg grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, an imaging focus mirror, and a linear array detector. The laser pump source, the wavelength division multiplexer, the fiber Bragg grating are connected in sequence, the wavelength division multiplexer is connected to the diaphragm. Light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating, a reflection spectrum of the fiber Bragg grating enters the slit of the fiber grating demodulation system as injected light. After passing through the slit, the injected light is reflected by the collimating mirror, the light splitting grating, and the imaging focus mirror in sequence, and is finally converged to the linear array detector.

IPC Classes  ?

• G01J 3/18 - Generating the spectrumMonochromators using diffraction elements, e.g. grating
• 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 6/02 - Optical fibres with cladding
• G02F 2/00 - Demodulating lightTransferring the modulation of modulated lightFrequency-changing of light

Abstract

A fiber grating demodulation system for enhancing spectral resolution by finely adjusting an imaging focus mirror, includes a laser pump source, a wavelength division multiplexer, a fiber Bragg grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, an imaging focus mirror, a linear array detector. The laser pump source, the wavelength division multiplexer, the fiber Bragg grating are connected in sequence, the wavelength division multiplexer is connected to the diaphragm. Light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating, a reflection spectrum of the fiber Bragg grating enters the slit of the fiber grating demodulation system as injected light. After passing through the slit, the injected light is reflected by the collimating mirror, the light splitting grating, and the imaging focus mirror in sequence, and is finally converged to the linear array detector.

IPC Classes  ?

• G01J 3/28 - Investigating the spectrum
• G01J 3/18 - Generating the spectrumMonochromators using diffraction elements, e.g. grating
• G02F 2/00 - Demodulating lightTransferring the modulation of modulated lightFrequency-changing of light
• 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 6/02 - Optical fibres with cladding

Abstract

A fiber grating demodulation system for enhancing spectral resolution by finely adjusting a linear array detector, includes a laser pump source, a wavelength division multiplexer, a fiber Bragg grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, an imaging focus mirror, a linear array detector. The laser pump source, the wavelength division multiplexer, and the fiber Bragg grating are connected in sequence, the wavelength division multiplexer is connected to the diaphragm. Light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating, and a reflection spectrum of the fiber Bragg grating enters the slit of the fiber grating demodulation system as injected light. After passing through the slit, the injected light is reflected by the collimating mirror, the light splitting grating, the imaging focus mirror in sequence, and is finally converged to the linear array detector.

IPC Classes  ?

• G01J 3/18 - Generating the spectrumMonochromators using diffraction elements, e.g. grating
• G02B 6/02 - Optical fibres with cladding
• G02F 2/00 - Demodulating lightTransferring the modulation of modulated lightFrequency-changing of light

Abstract

A fiber grating demodulation system for enhancing spectral resolution by finely adjusting a slit, includes a laser pump source, a wavelength division multiplexer, a fiber Bragg grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, an imaging focus mirror, and a linear array detector. The laser pump source, the wavelength division multiplexer, the fiber Bragg grating are connected in sequence, and the wavelength division multiplexer is connected to the diaphragm. Light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating, a reflection spectrum of the fiber Bragg grating enters the slit of the fiber grating demodulation system as injected light. After passing through the slit, the injected light is reflected by the collimating mirror, the light splitting grating, and the imaging focus mirror in sequence, and is finally converged to the linear array detector.

IPC Classes  ?

• G01J 3/18 - Generating the spectrumMonochromators using diffraction elements, e.g. grating
• G02B 6/02 - Optical fibres with cladding
• G02F 2/00 - Demodulating lightTransferring the modulation of modulated lightFrequency-changing of light
• G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light

Abstract

A fiber grating demodulation system for enhancing spectral resolution of a detector array, includes a laser pump source, a wavelength division multiplexer, a fiber Bragg grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, an imaging focus mirror, and a linear array detector. The laser pump source, the wavelength division multiplexer, and the fiber Bragg grating are connected in sequence, and the wavelength division multiplexer is connected to the diaphragm. Light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating. A reflection spectrum of the fiber Bragg grating enters the slit of the fiber grating demodulation system as injected light. After passing through the slit, the injected light is reflected by the collimating mirror. The light splitting grating, and the imaging focus mirror in sequence, and is finally converged to the linear array detector.

IPC Classes  ?

• G01J 3/18 - Generating the spectrumMonochromators using diffraction elements, e.g. grating
• G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
• G02F 2/00 - Demodulating lightTransferring the modulation of modulated lightFrequency-changing of light
• G02B 6/02 - Optical fibres with cladding

Abstract

A fiber grating demodulation system for enhancing spectral resolution by finely adjusting a collimating mirror, includes a laser pump source, a wavelength division multiplexer, a fiber Bragg grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, an imaging focus mirror, a linear array detector. The laser pump source, the wavelength division multiplexer, and the fiber Bragg grating are connected in sequence, the wavelength division multiplexer is connected to the diaphragm Light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating, a reflection spectrum of the fiber Bragg grating enters the slit of the fiber grating demodulation system as injected light. After passing through the slit, the injected light is reflected by the collimating mirror, the light splitting grating, and the imaging focus mirror in sequence, and is finally converged to the linear array detector.

IPC Classes  ?

• G01J 3/00 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours
• G01J 3/18 - Generating the spectrumMonochromators using diffraction elements, e.g. grating
• G02F 2/00 - Demodulating lightTransferring the modulation of modulated lightFrequency-changing of light
• 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 6/02 - Optical fibres with cladding

Abstract

A method for measuring the strain of material using a short cavity fiber laser, includes steps of: a) arranging the short cavity fiber laser, which laser comprises sequentially coupled laser diode pumping source, a wavelength division multiplexer, a fiber bragg grating, an active fiber and a loop mirror; b) fixing the short cavity fiber laser on the material whose strain will be measured, and matching the stretching direction of the fiber of the short cavity fiber laser with the direction of the strain produced by the material to be measured; c) measuring the drift amount of longitudinal mode output by the short cavity fiber laser; and d) calculating and obtaining the strain of the material to be measured.

IPC Classes  ?

• G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis

Abstract

The present invention provides an angular rate gyro in which a bell-shaped vibrator having nonuniform thickness, axially symmetric and multi curved surface combined structural features is used as a sensitive element. The angular rate gyro is composed of the bell-shaped vibrator, a vibrator fixing shaft, a vibrator base, an airtight hood, a housing and a circuit system. The bell-shaped vibrator includes a bell shoulder having a hemispheric shell structure, a bell waist having a cylindrical shell structure and a bell lip having a hyperboloidal shell structure. The bell-shaped vibrator, the base and a central shaft are mechanically and fixedly connected together to be formed into an integral core having sensitive gyratory effect. A circuit system is used to control vibration forms of the bell-shaped vibrator, perform signal processing and solve the applied angular rate.

IPC Classes  ?

• G01C 19/56 - Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
• G01C 19/5691 - Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using the phase shift of a vibration node or antinode of essentially three-dimensional vibrators, e.g. wine glass-type vibrators

Abstract

A method for measuring magnetic induction intensity of a magnetic field using a short cavity fiber laser, includes the steps of: a) arranging the short cavity fiber laser, where the short cavity laser has sequentially coupled laser diode pumping source, a wavelength division multiplexer, a fiber Bragg grating, an active optical fiber and a loop mirror; b) fixing the short cavity fiber laser on a magnetostrictive material; c) disposing the short cavity fiber laser and the magnetostrictive material in the magnetic field to be measured, and matching the stretching direction of the magnetostrictive material with the direction of the magnetic field to be measured; d) measuring the drift amount of longitudinal mode output by the short cavity fiber laser; and e) calculating the magnetic induction intensity of the magnetic field to be measured.

IPC Classes  ?

• G01R 33/02 - Measuring direction or magnitude of magnetic fields or magnetic flux
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01R 33/032 - Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday

Abstract

A method for measuring temperature of an object using the longitudinal mode output by a short cavity fiber laser, includes steps of: a) arranging the short cavity fiber laser, which laser comprises sequentially coupled laser diode pumping source, a wavelength division multiplexer, a fiber bragg grating, an active optical fiber and a loop mirror which are; b) contacting the short cavity fiber laser with the object whose temperature will be measured; c) measuring the drift amount of longitudinal mode output by the short cavity fiber laser; and d) calculating the temperature of the object to be measured. According to the present invention, the temperature can be measured accurately utilizing the features of the short cavity fiber laser. The arranged fiber laser has a small and simple structure, high measuring accuracy, good portability, and can be used in a variety of occasions.

IPC Classes  ?

• G01J 5/00 - Radiation pyrometry, e.g. infrared or optical thermometry
• H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
• G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres