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近红外高光谱分辨率激光雷达(HSRL)分子散射回波信号具有频谱展宽窄、能量弱等特点,相对于紫外和可见光HSRL研发难度大大增加。光谱滤光器作为HSRL的关键器件之一,与HSRL系统的反演精度密切相关。根据光谱滤光器的信号透射率和光谱分离比与HSRL系统反演精度的关系,通过分析1064 nm HSRL散射回波的特点,对两种具有代表性的干涉光谱滤光器进行了建模和仿真分析。结果表明,在光束发散角较小时,Fabry-Perot干涉滤光器具有较好的滤光性能,但对面形精度要求较高,不易于加工和装调;视场展宽Michelson干涉滤光器(FWMI)对光束的发散角不敏感,集光能力强,且对面形精度的要求相对较低,在实际应用中更适合用于近红外HSRL系统光谱滤光器。
Near-infrared hyperspectral resolution lidar (HSRL) molecular scattering echo signals have the characteristics of narrow spectrum broadening, weak energy, etc., and greatly increase the difficulty of developing HSRL relative to UV and visible light. As one of the key components of HSRL, spectral filter is closely related to the accuracy of HSRL inversion. According to the relationship between signal transmittance and spectral separation ratio of spectral filter and the inversion accuracy of HSRL system, two representative interferometric spectral filters were modeled and analyzed by analyzing the characteristics of 1064 nm HSRL scattered echo Simulation analysis. The results show that the Fabry-Perot interference filter has good filtering performance when the beam divergence angle is small, but it is difficult to process and setup because of its high surface area accuracy. The Michelson interference filter (FWMI) It is insensitive to the divergence angle of the light beam, has strong light gathering ability, and has relatively low requirements on the accuracy of the profile. It is more suitable for the spectral filter of the near-infrared HSRL system in practical applications.