Time-division-multiplexing polarized coherent Doppler wind-finding laser radar

A Doppler wind measurement and polarization coherent technology, applied in the direction of measuring devices, using re-radiation, re-radiation of electromagnetic waves, etc., can solve the problems of echo signal loss and inability to reflect aerosol conditions, etc., to simplify the structure and reduce complexity The effect of reducing and simplifying the receiver system

Active Publication Date: 2017-07-07
江苏光在科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) In the coherent wind lidar system, one of the necessary conditions for coherent beat frequency is that the signal light and the local oscillator light are in the same polarization state, but due to the aerosol depolarization effect, the echo signal is no longer linearly polarized light, As a result, the polarization state of part of the echo signal of the traditional coherent wind lidar is different from that of the local oscillator laser, resulting in the loss of the echo signal
[0010] (2) Because the depolarization ratio is related to the aerosol situation, the traditional coherent wind lidar signal cannot reflect the aerosol situation

Method used

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  • Time-division-multiplexing polarized coherent Doppler wind-finding laser radar
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  • Time-division-multiplexing polarized coherent Doppler wind-finding laser radar

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Embodiment 1

[0060] figure 2 is the structural diagram of the time-division multiplexed polarization coherent Doppler wind lidar, image 3 is based on figure 2 The control timing diagram of the polarization coherent Doppler wind lidar with medium time division multiplexing is combined as follows Figure 2 to Figure 3 The embodiments of the present invention are illustrated in detail.

[0061] Such as figure 2 As shown, a time-division multiplexing polarization coherent Doppler wind lidar includes: a continuous wave laser 1, an optical fiber beam splitter 2, an optical modulator 3, a laser amplifier 4, a transmitting telescope 5, a receiving telescope 6, a polarization Beam splitting element 7, polarization maintaining delay element 8, fast and slow axis conversion element 9, photoelectric switch 10, coupler 11, photodetector 12, data acquisition card 13 and digital signal processing module 14; wherein,

[0062] The output end of the continuous wave laser 1 is connected with the inpu...

Embodiment 2

[0100] like Figure 4 As shown, the present invention provides another time-division multiplexing polarization coherent Doppler wind lidar. The difference from Embodiment 1 lies in the position of the polarization maintaining delay element 8 . like Figure 4 As shown, a time-division multiplexing polarization coherent Doppler wind lidar includes: a continuous wave laser 1, an optical fiber beam splitter 2, an optical modulator 3, a laser amplifier 4, a transmitting telescope 5, a receiving telescope 6, a polarization splitter Beam element 7, polarization maintaining delay element 8, fast and slow axis conversion element 9, photoelectric switch 10, coupler 11, photodetector 12, data acquisition card 13 and digital signal processing module 14; Wherein,

[0101] The output end of the continuous wave laser 1 is connected to the input end of the optical fiber splitter 2, and the optical fiber splitter 2 is used to divide the optical signal output by the continuous wave laser 1 in...

Embodiment 3

[0109] Such as Figure 5 As shown, the present invention provides another time-division multiplexing polarization coherent Doppler wind lidar, comprising: a continuous wave laser 1, an optical fiber beam splitter 2, an optical modulator 3, a laser amplifier 4, a transmitting telescope 5, Receiving telescope 6, polarization beam splitting element 7, polarization maintaining delay element 8, fast and slow axis conversion element 9, coupler 11, photodetector 12, data acquisition card 13 and digital signal processing module 14;

[0110] The output end of the continuous wave laser 1 is connected with the input end of the optical fiber beam splitter 2, the first output end of the optical fiber beam splitter 2 is connected with the input end of the optical modulator 3, and the output end of the optical modulator 3 is connected with the laser amplifier 4 The input end is connected, and the input end of transmitting telescope 5 is connected with the output end of laser amplifier 4; The...

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Abstract

The invention discloses a time-division-multiplexing polarized coherent Doppler wind-finding laser radar comprising a continuous wave laser, an optical fiber splitter, an optical modulator, a transmitting telescope, a receiving telescope, a polarization splitting element, a polarization-maintaining time-delay element, a fast and slow axis conversion element, a photoelectric switch, a coupler, a photodetector, a data acquisition card and a digital signal processing module. The fast and slow axis conversion element converts S polarization-state signal light into a P polarization-state signal light; and beating with different polarization-state echo signals can be realized only by one single P polarization-state local isolator light. With the polarization-maintaining time-delay fiber, signals with different polarization states are separated in a time domain, so that one photodetector can detect different polarization-state echo signals; and compared with the way of detecting different polarization-state mixed signals by using two photodetectors, the way employed by the polarized coherent Doppler wind-finding laser radar enables the error caused by different responses of the detectors to be reduced, so that the receiver system of the laser radar can be simplified.

Description

technical field [0001] The invention relates to lidar technology, in particular to a polarization coherent Doppler wind-measuring lidar with time division multiplexing. Background technique [0002] Accurate atmospheric wind field measurement is of great significance for detecting atmospheric pollution, obtaining military environmental intelligence, improving aerospace safety, improving the accuracy of weather forecasts, and improving climate models. Wind lidar is an effective means of wind field measurement, which can be divided into direct detection wind lidar and coherent detection wind lidar. The direct detection wind measurement lidar uses an optical discriminator to convert the Doppler frequency shift information into the relative change of energy, and realizes the measurement of the atmospheric wind field; the coherent detection wind measurement lidar uses the coherence between the atmospheric echo signal and the local oscillator laser The beat frequency realizes the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 张仁俊赵自豪
Owner 江苏光在科技有限公司
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