Doppler calibration method for portable wind lidar

Abstract

The invention discloses a portable wind gauging laser radar Doppler adjusting method which is characterized in that it arranges a Nd:YAG laser; the impulse light sent by the laser incidents into the rim of the illuminating rotation disk through the collimating mirror and the exiting aperture after weakening and delaying; the rotating of the rotation disk makes the brand light at rotation disk rim to generate Doppler frequency shift; the brand light with Doppler frequency shift signal is transmitted by another optic fiber after the receiving drive plate; the other input end of the melting optical fiber coupler generates crossfire signal as reference light which is coupled with the reflecting light with Doppler frequency shift signal by another optical fiber coupler after adjustable attenuator and achieves to wind gauging laser radar receiver to do signal analyzing and processing.

Description

technical field [0001] The invention belongs to the field of laser radar, in particular to a Doppler calibration method of wind measuring laser radar. Background technique [0002] Doppler calibration of wind lidar is an important unit of Doppler wind lidar. According to the research results at home and abroad, the Doppler calibration instrument for wind lidar is still blank, and there is no practical and reliable instrument for Doppler calibration of the wind lidar system itself. [0003] The usual way to verify the correctness of various wind lidar measurements is to compare with the results measured by other wind measurement methods. Due to the large measurement errors of various methods, the purpose of calibration cannot be achieved. The calibration method that has been reported so far is the hard target calibration method, but it is only a temporary optical path for rough calibration, and the accuracy is not high. [0004] According to most reports: the hard target mo...

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Problems solved by technology

[0003] The usual way to verify the correctness of various wind lidar measurements is to compare with the results measured by other wind measurement methods. Due to the large measurement errors of various methods, the purpose of calibration cannot be achieved

The calibration method that has been reported so far is the hard target calibration method, but it is only a temporary optical path for rough calibration, and the accuracy is not high

[0004] According to most reports: the hard target moving along the linear guide rail requires a large experimental site, the cost is expensive, and because of mechanical vibration, the calibrated speed range is very small

The existing rotating hard target: firstly, the turntable is large, and the system is not stable enough; secondly, the measurement error that may be caused by the frequency broadening of the rotating target is not considered; in addition, the optical path temporarily built in the experiment is relatively large and scattered, and it is not easy to move

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