Calibration device for directly detecting wind lidar
A technology of wind measurement laser radar and calibration device, which is applied in the direction of radio wave measurement system, climate sustainability, instruments, etc., can solve the problems of calibration result error, non-discovery, uneven wind speed of pipeline, etc., achieve high accuracy, eliminate error, the effect of simple device structure
Active Publication Date: 2020-03-24
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
In China, Tang Lei et al. (Tang Lei, et al. "Rayleigh Wind Lidar System Performance Improvement and Middle and Upper Atmospheric Wind Field Observation." China Laser 43.7 (2016)) built a 60m quasi-sealed atmospheric pipeline, using standard compression The air washes away the aerosol particles in the pipeline, and forms a quasi-static atmospheric molecular environment with zero wind speed after sealing, which is used for zero wind speed calibration. Fans and anemometers are installed on the side wall of the pipeline for non-zero wind speed calibration. The broadening of the laser spectrum is certain, and it is impossible to simulate the laser backscattering spectrum at different heights, and when using a fan for non-zero wind speed calibration, the uneven wind speed inside the pipeline will also bring errors to the calibration results
We have also conducted research on other radar institutions, and found no other better method for wind speed calibration of Rayleigh wind radar
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[0018] The present invention will be further described below in conjunction with example and accompanying drawing, but should not limit protection scope of the present invention with this.
[0019] refer to figure 1 , figure 1 It is a structural block diagram of the calibration device of the direct detection wind measuring laser radar of the present invention. It can be seen from the figure that the calibration device of the present invention directly detects the wind measuring laser radar, including a 1064nm seed laser 1, a seed laser driving source 2, and an electro-optic phase modulator 3 , Gaussian white noise source 4, adjustable microwave attenuator 5, radio frequency amplifier 6, acousto-optic modulator 7, fiber amplifier 8, double frequency crystal 9, triple frequency crystal 10, beam splitter 11, collimating beam expander Group 12, signal collecting optical fiber 13, receiving system 14 for direct detection wind laser radar. The connection relationship of the above ...
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The invention discloses a calibration device for directly detecting a wind lidar. An electro-optic phase modulator is used for carrying out spectrum broadening on a seed laser to simulate a back scattering spectrum of high-altitude atmospheric molecules; and inputting a broadened spectrum into a receiving system of a direct detection wind lidar, and changing output frequency of the laser by adjusting a driving source of the seed laser so as to simulate Doppler frequency shift of an atmospheric backscattering spectrum. Corresponding wind speed is inversed according to change of dual-channel energy of a radar receiving system under different frequency shift amounts, and is compared with wind speed caused by theoretical Doppler frequency shift, so that rapid and accurate calibration of zero wind speed and wind speed precision of the direct detection wind lidar is realized.
Description
technical field [0001] The invention belongs to the field of laser radar, in particular to a calibration device for directly detecting wind measuring laser radar. Background technique [0002] Atmospheric wind field is the main driving force of atmospheric circulation, air-sea circulation, aerosol activity and various weather phenomena, and plays an extremely important role in meteorology, environment and military fields. Doppler wind lidar is the only tool that can detect the global atmospheric wind field with high precision so far. Its basic principle is to use the double FP etalon as a frequency discriminator to identify the frequency of the laser backscattered light of atmospheric molecules. In order to obtain the Doppler frequency shift, and then obtain the radial wind speed. In order to obtain accurate wind speed information, it is necessary to calibrate the radar system for wind speed. The backscattering spectrum of aerosol molecules is close to the laser spectrum, ...
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Login to View More IPC IPC(8): G01S7/497
CPCG01S7/497Y02A90/10
Inventor 陈卫标刘菲菲毕德仓杨巨鑫张朝杰庞恺刘恒
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI