静止轨道中波红外成像光谱仪分光成像系统  

Spectroscopic Imaging System in Mid-Wave Infrared Imaging Spectrometer on Geostationary Orbit

作　　者：朱嘉诚 陆伟奇 赵知诚 陈新华[1,2] 沈为民 Zhu Jiacheng;Lu Weiqi;Zhao Zhicheng;Chen Xinhua;Shen Weimin(School of Optoelectronic Science and Engineering,Soochow University,Suzhou,Jiangsu 215006,China;Key Laboratory of Modern Optical Technology,Ministry of Education,Suzhou,Jiangsu 215006,China)

机构地区：[1]苏州大学光电科学与工程学院,江苏苏州215006 [2]教育部现代光学技术重点实验室,江苏苏州215006

出　　处：《光学学报》2021年第11期170-177,共8页Acta Optica Sinica

基　　金：国家重点研发计划(2016YFB0500501);中国博士后科学基金(2020M681700)。

摘　　要：设计和研制了用于静止轨道高光谱遥感卫星的中波红外成像光谱仪分光成像系统。根据静止轨道特点分析光学系统指标参数,指出分光成像系统具有狭缝长、相对孔径小和体积紧凑的特点。设计了波长为3~5μm,狭缝拼接长度为49 mm,光谱采样间隔为50 nm,系统F数为5.4的双狭缝Offner型分光成像系统。采用整机制冷提高系统灵敏度,分析结果表明,工作温度低于160 K时,系统噪声等效温差(NETD)可降低至0.2 K,并根据制冷温度进行消热差设计。根据光学设计结果,研制材料为全铝合金的分光成像系统原理样机,自研的凸面闪耀衍射光栅的峰值效率高达86.4%。利用可见光和近红外光的高级衍射谱测试常温下样机性能,结果表明,研制的样机光谱成像质量优、光谱畸变小,各项指标均满足设计要求。The spectroscopic imaging system in a mid-wave infrared imaging spectrometer was designed and developed for hyperspectral remote sensing satellites on geostationary orbit.According to the characteristics of geostationary orbit,index parameters of the optical system were analyzed.It was pointed that such spectroscopic imaging system features long slit,small relative aperture,and compact size.A double-slit Offner spectroscopic imaging system was designed with a spectral range of 3-5μm,splicing slit length of 49 mm,spectral sampling distance of 50 nm,and F-number of 5.4.The whole machine refrigeration was adopted to improve optical system sensitivity.The analysis results showed that when the working temperature was lower than 160 K,the noise equivalent temperature difference(NETD)reduced to 0.2 K,and an athermal design was performed on the basis of the cooling temperature.Based on the results of optical design,the whole aluminum alloy imaging system prototype was developed.The peak efficiency of a self-developed convex blazed diffraction grating reached 86.4%.The performance of the prototype at room temperature was tested using high order diffraction spectrum of visible and near-infrared light.The test results showed high imaging quality of the imaging spectrometer with slight smile and keystone distortions;in addition,all specifications met the design requirements.

关 键 词：光学设计 成像光谱仪 中波红外 凸面闪耀光栅 

分 类 号：TH744[机械工程—光学工程]