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分析了视场展宽迈克耳孙干涉仪(FWMI)用作高光谱分辨率激光雷达(HSRL)光谱滤光器时一个未引起广泛重视却又非常重要的问题:FWMI增透(AR)膜反射率容差评估。由于FWMI不同材料分界面的AR膜无法做到100%透射,一旦光线经过该表面,将引起部分光被反射,且这部分光线将成为游离光线在干涉仪主体中不断被多次反射。分析了AR膜反射率导致的多次反射对FWMI滤光性能的影响机理,并采用光谱分离比(SDR)作为性能量化指标,提出了一种迭代算法来定量评估FWMI光谱分离特性与AR膜反射率的关系。分析结果表明,AR膜反射尽管对大气分子散射信号的透射率影响不大,但会较大的降低FWMI对气溶胶散射信号的抑制能力,最终总体上导致SDR的降低。本方法对FWMI AR膜反射率容差评估具有较大的参考价值,是保证FWMI良好设计性能的重要方面之一。
Analysis of field-of-view broadening The Michelson interferometer (FWMI) is an issue of undifferentiated but important importance when used as a spectral filter for hyperspectral resolution lidar (HSRL): FWMI AR Reflectance Tolerance assessment. Due to the fact that the AR film of FWMI at different material interfaces can not be transmitted 100%, once the light passes through the surface, part of the light will be reflected and this part of the light will be continuously reflected by the interferometer in the main body. The influence mechanism of multiple reflections caused by AR film reflectivity on the performance of FWMI filter was analyzed and the spectral separation ratio (SDR) was used as the performance quantification index. An iterative algorithm was proposed to quantitatively evaluate the relationship between FWMI spectral separation and AR film reflectivity Rate of relationship. The results show that although the AR film reflection has little effect on the transmission of atmospheric molecular scattering signals, it will greatly reduce the inhibitory ability of FWMI on the aerosol scattering signal and ultimately lead to the decrease of SDR. The method has great reference value for the evaluation of the tolerance of the FWMI AR film, and is one of the important aspects to ensure the good design performance of the FWMI.