Doppler Wind LiDAR System

Abstract

This application discloses a Doppler wind measurement lidar system. A small part of the laser signal emitted by the transmitting system enters the locked channel of the FP etalon through the locked channel optical path in the receiving optical system and the first analog detection for detecting the laser signal. The laser signal entering the locked channel of the FP etalon is detected by the second analog detector. The laser signals detected by the first analog detector and the second analog detector are collected by the analog acquisition card and sent to the first control system of the control system. The first control system processes the received laser signal collected by the analog acquisition card to obtain the frequency of the outgoing laser and the transmittance of the locked channel. According to the transmittance of the locked channel, the cavity length of the FP etalon is adjusted so that the emitted laser The frequency is locked at the cross point of the transmittance of the two signal channels of the FP etalon, realizing the real-time locking of the outgoing laser frequency and the position of the FP etalon, and improving the measurement accuracy.

Description

technical field [0001] This application relates to the technical field of laser radar, in particular to a Doppler wind measuring laser radar system. Background technique [0002] The Doppler wind lidar system uses a direct detection method to reflect the atmospheric wind speed through the group velocity of atmospheric molecules. Its working process is as follows: the transmitting system in the Doppler wind lidar system transmits laser signals to the atmosphere, the laser signals encounter atmospheric molecules and produce Rayleigh backscattering, and the Rayleigh backscattering atmospheric echo signals are received by the receiving system. If the atmospheric molecules move due to the wind, the frequency of the atmospheric echo signal received by the receiving system changes relative to the frequency of the laser signal emitted by the transmitting system, that is, a Doppler frequency shift occurs. After the receiving system detects the Doppler frequency shift of the laser du...

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Problems solved by technology

[0005] In view of this, the embodiment of the present application provides a Doppler wind-measuring lidar system to solve the problem that in the prior art, the real-time locking of the outgoing laser frequency and the position of the FP etalon cannot be realized, and the measurement accuracy is reduced.

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