高分辨率超大幅宽星载成像光谱仪光学系统设计  

Optical System Design of a Spaceborne Imaging Spectrometer with High Resolution and Super Swatch

作　　者：王保华[1] 李可[1] 唐绍凡[1] 张秀茜 王媛媛[1] WANG Baohua;LI Ke;TANG Shaofan;ZHANG Xiuqian;WANG Yuanyuan(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2021年第1期92-99,共8页Spacecraft Recovery & Remote Sensing

基　　金：科技部国家重点研发计划项目(2016YFB0500501)。

摘　　要：针对高空间分辨率、高光谱分辨率和大幅宽成像的遥感应用需求,提出了高分辨率超大幅宽星载成像光谱仪技术方案,分析确定了成像光谱仪光学系统指标,设计了空间成像光学系统和光谱成像光学系统。空间成像光学系统采用自由曲面离轴三反设计方案,实现了大视场、大相对孔径像方远心设计,系统相对畸变小于0.02%;光谱成像光学系统的狭缝长度超过90mm,采用新型离轴透镜补偿型Offner设计方案,实现了长狭缝高保真光谱成像设计,谱线弯曲和色畸变均小于1/10像元尺寸。设计结果表明,高分辨率超大幅宽星载成像光谱仪光学系统简单紧凑,成像品质接近系统衍射极限,满足星载高光谱对地成像的数据应用要求。In order to meet the requirements of remote sensing applications with high spatial resolution,hyperspectral resolution and super swatch,a new scheme of the space imaging spectrometer with high resolution and super swatch is put forward.The spatial resolution and swatch are 50m and 150km respectively,and the hyperspectral resolution can be better than 5nm between 0.4μm and 1.0μm.The comprehensive performance has reached the international advanced level.The index parameters are optimized based on SNR and the modulation transfer function.Then the space imaging optical system and the spectrum imaging optical system are designed according to the optical desigh parameters.The free-form surface is adopted for the off-axis mirror to realize telecentric design of wide field of view and large relative aperture.The relative distortion is lower than 0.02%.The slit length is over 90mm in the spectrum imaging optical system.And the new oftener configuration with off-axis correction lens is put forward to realize high fidelity design.The keystone and smile can be both controlled within 1/10 pixel.The optical system of the space imaging spectrometer with high resolution and super-swatch has so favorable imaging quality and compact volume,which can satisfy the demand of remote sensing application.

关 键 词：成像光谱仪 光学系统设计 自由曲面 凸面光栅 航天遥感 

分 类 号：O439[机械工程—光学工程]