基于双F-P干涉仪的多普勒测风激光雷达的性能分析
Doppler wind lidar with dual Fabry-Perot interferometer
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摘要: 自行研制了一台基于双边缘技术的多普勒激光雷达，用于测量对流层大气风场。该雷达采用具有高光谱分辨率的双Fabry-Perot干涉仪来检测气溶胶后向散射的多普勒频移量。给出了多普勒测风激光雷达的结构和参数。利用干涉仪参数讨论了雷达系统的测量精度。实验测定了双干涉仪的频谱曲线。通过计算和分析，由测量的干涉仪频谱曲线的的标准偏差引起的系统测量误差为0.5 m/s。系统的测量误差随着测量的高度和所测速度的增加在增大，在高度10 km测量50 m/s的风速时系统的测量误差小于2 m/s。
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关键词:
- 多普勒 /
- Fabry-Perot干涉仪 /
- 风 /
- 激光雷达 /
- 后向散射
Abstract: The 1 064 nm Doppler wind lidar with a dual Fabry-Perot interferometer based on the edge technique has been developed to measure the wind profile in the troposphere. The construction of the lidar system is described. The dual interferometer with high-spectral resolution is used to discriminate the Doppler shift from the aerosol backscattering. The accuracy of the lidar system is analyzed and discussed especially for the interferometer parameters. The transmittance curve of the interferometer is measured and the standard deviation of the transmittance will cause a velocity error of 0.5 m/s. The result of the analysis show that the error of the lidar measurement ranges from less than 2 m/s up to 10 km for the wind velocity of 50 m/s and the error increases with the increase of the radial vel-
Key words:
- doppler /
- fabry-perot interferometer /
- wind /
- lidar /
- backscattering
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