侧摆扩视场型星载干涉光谱成像仪杂散光抑制研究  

Stray Light Suppression in Sweep Mirror Field-Widened Space-Borne Fourier Transform Imaging Spectrometer

作　　者：张智南[1,2] 李立波 邹纯博[1] 郝雄波[1] 孙剑 刘学斌[1] 王鹏冲 刘杰[1,2] Zhang Zhinan;Li Libo;Zou Chunbo;Hao Xiongbo;Sun Jian;Liu Xuebin;Wang Pengchong;Liu Jie(Key Laboratory of Spectral Imaging Technology,Xian's Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an,Shaanxi 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所光谱成像技术重点实验室,陕西西安710119 [2]中国科学院大学,北京100049

出　　处：《光学学报》2021年第10期179-186,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61905275);陕西省重点研发计划(2020SF-284);航空科学基金(201701M9001)。

摘　　要：侧摆扩视场型干涉光谱成像仪通过在光学系统前增加侧摆反射镜来实现视场扩展的功能,然而增加侧摆反射镜会使得不同视场不同通道的光线交错分布,无法使用传统消杂光设计,给杂散光抑制带来困难。针对此类型光学系统提出了一个消杂光设计方法。当侧摆反射镜位于0°、15°、-15°视场位置时,对可见近红外系统和短波红外系统进行了点源透过率(PST)仿真分析。分析结果表明,对于所有侧摆反射镜位置,在视场外0.5°位置处空间视场方向和光谱视场方向的PST可降低至10-3。基于观测模式,对高光谱成像仪在轨工作时的信号源与杂光源进行分析。基于PST仿真结果,对杂光源在焦平面处产生的杂光能量进行研究,并分析了高光谱成像仪的信杂比,侧摆反射镜位于0°视场位置时可见近红外系统的信杂比为0.1%,短波红外系统的信杂比为0.6%。结果表明,所提的杂散光抑制措施有效,满足星载高光谱仪对杂散光的技术要求。The field widening of a sweep mirror field-widened Fourier transform imaging spectrometer is achieved by adding a sweep mirror before its optical system.However,the addition of the sweep mirror causes the cross distribution of rays from different fields and different channels,which presents a difficulty in the suppression of stray light,and thus the traditional stray light suppression design is no longer valid.To solve this problem,a new design of stray light suppression is proposed.Based on the stray light suppression design,the point source transmittance(PST)stimulation and analysis of the visible and near-infrared optical system and the shortwave infrared optical system is presented for the sweep mirror at different field of view locations of 0°,15°,and-15°.The analysis results show that as for all sweep mirror locations,the PST along the spatial direction and spectral direction at 0.5°off-field angle can be reduced to 10-3.Based on the observation mode,the signal source and stray light source of the on-orbit imaging spectrometer are analyzed.In addition,based on the PST stimulation results,the stray light irradiance at the focal plane is studied and the signal-to-stray ratio is calculated.It shows that the signal-to-stray ratio of the visible and near-infrared optical system is 0.1%and that of the shortwave infrared optical system is 0.6%.The results indicate that the proposed stray light suppression method is effective and can meet the requirement of the space-borne imaging spectrometer.

关 键 词：散射 杂散光分析 点源透过率 信杂比 干涉光谱成像仪 

分 类 号：TH744[机械工程—光学工程]