星载红外双谱段高光谱成像仪光学系统设计  

ptical system design of spaceborne dual-band infrared hyperspectral imager

作　　者：王保华[1,2] 姜会林 唐绍凡[1] 张绪国[1] 李阳[1] 封宇航 WANG Bao-hua;JIANG Hui-lin;TANG Shao-fan;ZHANG Xu-guo;LI Yang;FENG Yu-hang(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;School of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]长春理工大学光电工程学院,吉林长春130022

出　　处：《激光与红外》2023年第11期1750-1756,共7页Laser & Infrared

摘　　要：针对国内外星载红外高光谱成像数据空白和迫切应用需求,本文提出了星载红外双谱段高光谱成像技术方案,实现高空间分辨率、高光谱分辨率和高温度灵敏度成像。工作谱段覆盖中波红外(3~5μm)和长波红外(8~12.5μm),中波和长波红外谱段的光谱分辨率分别为50 nm和100 nm,空间分辨率为60 m,成像幅宽为60 km,噪声等效温差优于0.2 K。分析确定了红外高光谱成像仪的光学系统技术指标,设计了望远光学系统、光谱成像光学系统和高光谱成像仪整体光学系统。望远光学系统采用自由曲面离轴三反设计方案,实现了大相对孔径像方远心和低畸变设计,相对畸变小于0.135%;光谱成像光学系统采用Wynne-Offner结构形式,实现了高成像质量、轻小型化设计,不同波长的传函均接近衍射极限。设计结果表明,星载红外双谱段高光谱成像仪的光学系统成像质量优良,结构布局紧凑合理,具有较强的工程应用价值。Aiming at the blank and urgent application needsof infrared hyperspectral imaging data,aspacebornedual-band infrared hyperspectral imaging scheme is proposed to obtain images with high spatial resolution,high spectral resolution and high temperature sensitivity.The working spectrum covers 3~5μm(MWIR)and 8~12.5μm(LWIR).The spectral resolution of MWIR and LWIR is 50 nm and 100 nm,respectively.The spatial resolution is 60 m,the imaging width is 60km,and the noise equivalent temperature differencesis less than 0.2 K.In this paper,the optical system specifications of the spaceborne dual-band infraredhyperspectral imagerare analyzed and determined.Moreover,the telescope optical system,the spectral imaging optical system and the overall optical system are designed.The off-axis three-mirror design schemewithfree-form surface is adopted in the telescope optical system to realize the design of low distortion and high telecentricity under large relative aperture.The relative distortion of the telescope optical systemis less than 0.135%.The Wynne-Offner structure is used in the spectral imaging optical system to achieve the design of high imaging quality,low smile and keystone.The MTF of the spectral imaging optical system is close to the diffraction limit under different wavelengths.The design results show that the optical system of thespacebornedual-band infraredhyperspectral imager has excellent imaging quality and reasonable structural layout that has strong engineering application value.

关 键 词：光学遥感 高光谱成像 红外双谱段 光学系统设计 

分 类 号：O439[机械工程—光学工程] TH743[理学—光学]