A pulsed LiDAR including a master laser able to emit a master laser beam, a pulse generator arranged to generate a pump signal including at least one pulse, a peak value of which varies during the at least one pulse of the pump signal, and a semiconductor optical amplifier (SOA) arranged to amplify and modulate the master laser beam on the basis of the pump signal, with the amplified and modulated laser beam forming a measurement laser beam is disclosed.
The invention relates to pulsed LiDAR comprising a master laser able to emit a master laser beam, a pulse generator arranged to generate a pump signal comprising at least one pulse, a peak value of which varies during said at least one pulse of said pump signal, and a semiconductor optical amplifier (SOA) arranged to amplify and modulate the master laser beam on the basis of the pump signal, with the amplified and modulated laser beam forming a measurement laser beam.
The invention relates to pulsed LiDAR comprising a master laser able to emit a master laser beam, a pulse generator arranged to generate a pump signal comprising at least one pulse, a peak value of which varies during said at least one pulse of said pump signal, and a semiconductor optical amplifier (SOA) arranged to amplify and modulate the master laser beam on the basis of the pump signal, with the amplified and modulated laser beam forming a measurement laser beam.
A method for processing telemetry data for estimating a wind speed. The method includes a hybridization by temporal combination, and/or by weighting, and/or by averaged projection.
An optical device including an acousto-optic modulator (AOM), a laser, an upstream optical fibre extending between the laser and the AOM, a downstream optical fibre located downstream of the AOM and a reflector connected to the fibre downstream of the AOM. The optical device including the upstream fibre is a polarisation-maintaining optical fibre, and/or the downstream fibre is arranged so that a transit time of the optical beam through said downstream fibre from the AOM to the reflecting means is nonzero and shorter than or equal to half an open duration of the AOM, and/or the AOM includes a crystal in which the entrance/exit faces are planar and are at a nonzero angle to each other, and/or at least one of the two entrance/exit faces is at a nonzero angle to a direction of propagation of the acoustic wave in the crystal.
G02F 1/125 - 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 modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves in an optical waveguide structure
G02F 1/11 - 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 modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
H01S 3/08 - Construction or shape of optical resonators or components thereof
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H01S 3/106 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
H01S 3/23 - Arrangement of two or more lasers not provided for in groups , e.g. tandem arrangement of separate active media
6.
METHOD FOR PROCESSING TELEMETRY DATA FOR ESTIMATING A WIND SPEED
The invention relates to a method for processing telemetry data for estimating a wind speed. The method comprises: - a hybridization by temporal combination, and/or - by weighting, and/or - by averaged projection.
G01S 17/95 - Lidar systems, specially adapted for specific applications for meteorological use
G01S 17/58 - Velocity or trajectory determination systemsSense-of-movement determination systems
G01P 5/26 - Measuring speed of fluids, e.g. of air streamMeasuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
G01S 15/88 - Sonar systems specially adapted for specific applications
G01S 13/95 - Radar or analogous systems, specially adapted for specific applications for meteorological use
7.
DOUBLE-PASS FIBRE-OPTIC AMPLIFER AND OPTICAL-DEVICE ARCHITECTURES
Optical device comprising an acousto-optic modulator (AOM), a laser, an upstream optical fibre extending between the laser and the AOM, a downstream optical fibre located downstream of the AOM and a reflecting means connected to the fibre downstream of the AOM. The optical device is characterised in that: - the upstream fibre is a polarisation-maintaining optical fibre, and/or - the downstream fibre is arranged so that a transit time of the optical beam through said downstream fibre from the AOM to the reflecting means is nonzero and shorter than or equal to half an open duration of the AOM, and/or - the AOM comprises a crystal in which the entrance/exit faces are planar and are at a nonzero angle to each other, and/or at least one of the two entrance/exit faces is at a nonzero angle to a direction of propagation of the acoustic wave in the crystal.
G02F 1/11 - 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 modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
The invention relates to a device (1) for calibrating an atmospheric lidar (2) comprising an optical fibre (3) arranged to propagate at least one portion of a beam (5) emitted by the lidar, a reflector element (6) located at one end of the optical fibre and arranged to reflect into the optical fibre one segment (7) of the at least one portion of the beam propagating through the optical fibre; the calibrating device being characterised in that the optical fibre comprises scatterers that are distributed along the optical fibre and that backscatter fractions of the at least one portion of the beam propagating through the optical fibre, and a coupling device (9) arranged to couple into the optical fibre at least one portion (4) of the beam emitted by the lidar, and into the lidar at least one portion (71, 81, 181) of said fractions backscattered by the scatterers, and at least one portion of a beam reflected by the reflector element.
The invention relates to a method for measuring parameters of one or more optical beams emitted by an optoelectronic system, and an associated device. The measurement method comprises a calculation of a position of an attachment area of a movement system on which an optical device is attached, such that an alignment axis of the attachment zone coincides with an expected emission axis of the optical beam. The calculation is carried out based on characteristic data of the optoelectronic system. According to the invention, the method comprises positioning the attachment area relative to the optoelectronic system, in the calculated position, and a measurement of one or more parameters of the optical beam by the optical device.
The invention relates to a method, and to an associated device, for determining the effectiveness of an optronic system comprising a computation of a position and of a direction of a zone for fixing a motion actuation system, on which zone a Wave Front Analyser (AFO) is fixed, so that an alignment axis of the fixing zone coincides with an emission axis provided with an optical beam emitted by the optronic system, the computation being carried out on the basis of data relating to an emission direction of the beam emitted by the optronic system. The method further comprises positioning the fixing zone, relative to the optronic system, in the computed position, measuring, by the AFO, data relating to a Wave Front (FO) of the optical beam and determining the effectiveness of the optronic system based on one or more items of data relating to the FO measured by the AFO.
The present invention relates to a method for determining the flow of a fluid in a volume of interest, including steps of remotely measuring, at a plurality of measurement points distributed along at least three axes of measurement having different spatial orientations passing through the volume of interest, the radial velocity of said fluid in the vicinity of said measurement points, and for calculating the velocity of the fluid at a plurality of calculation points distributed in a grid in the volume of interest, wherein the calculation of the velocity of the fluid includes the use of a mechanical behavior model of said fluid. The invention also relates to a device implementing said method.
G01P 5/26 - Measuring speed of fluids, e.g. of air streamMeasuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
12.
OPTICAL HEAD FOR PERFORMING AN ATMOSPHERIC MEASUREMENT, AND RELATED SYSTEM AND MANUFACTURING METHOD
The invention relates to an optical head (1) for performing an atmospheric measurement, which is capable of receiving at least one pair consisting of a refractive optical system (23) and an optical fibre for transmission and reception. The optical head is made in a single piece and so as to be rigid, and includes at least one recess (2") for receiving at least one element from among a refractive optical system (23) and an optical fibre for transmission and reception, said recess (2") being formed by an outer shell (3) that comprises a first composition consisting of a rigid, athermal composite material, and inside which is attached at least one metal adjustment insert (4) that forms a support for one element from among the refractive optical system (23) and the optical fibre for transmission and reception, and comprises a second composition that can be more easily machined than the first composition and is machined so as to ensure that the optical axis (50) of the refractive optical system (23) and the axis of the output beam of the optical fibre for transmission and reception coincide along a single axis, and so as to ensure the positioning of said single axis relative to a reference axis. The invention also relates to a related system and manufacturing method.
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