双Fabry-Perot标准具在直接测风激光雷达系统中的应用与分析
Application and analysis of the dual Fabry-Perot etalon in a direct detection wind lidar
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摘要: 简叙了双Fabry-Perot标准具在自行研制的测风激光雷达中检测多普勒频移的原理，给出了测风激光雷达系统的参数,对入射光束的入射角和发散角对标准具频谱曲线的影响进行了分析和稳定性实验，结果显示在短期内不稳定性带来的风速测量误差仅为0.016 m/s。测定了双标准具的频谱曲线，通过对标准具频谱曲线的分析显示:测量误差在测量的动态范围内随着速度的增大而增大，随着测量脉冲次数的增加而减少，同时速度的测量误差随着高度的增加而加大，在5 km时最大测量速度误差为0.6 m/s。
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关键词:
- 大气光学 /
- 激光雷达 /
- 多普勒 /
- 风场测量 /
- Fabry-Perot标准具
Abstract: A direct detection Doppler wind lidar with the dual Fabry-Perot technique has been built and the system is described. The dual etalon with high-spectral resolution is used to discriminate the Doppler shift by the aerosol backscattering. Analysis shows that the etalon transmittance is affected by the beam divergence. The stability of the dual etalon is also analyzed and the result shows the system is steady in 100 min. The transmittance curve of the dual etalon is measured, which indicates that the error in the velocity dynamic range is less than 0.6 m/s for heights up to 5 km and the error increases with the large radial velocity and decreases with pulse number increasing.-
Key words:
- atmospheric optics /
- lidar /
- doppler /
- wind field measurement /
- fabry-perot etalon
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