光学 精密工程, 2019, 27 (3): 533, 网络出版: 2019-05-30   

大视场快焦比施密特系统在星载光谱仪中的应用

Application of Schmidt optical system with wide-field of view and fast focal ratio to aerospace imaging spectrometer
作者单位
中国科学院 上海技术物理研究所 空间主动光电技术重点实验室, 上海 200083
摘要
根据大视场和快焦比空间遥感高光谱成像仪的研究目标, 采用折叠三反施密特望远镜和自由曲面Offner凸面光栅光谱仪结构, 设计了一个视场为5°, 焦比为2, 工作谱段在400~1 000 nm, 光谱分辨率为5 nm的星载高光谱成像仪光学系统。推导了非对称非球面施密特主镜的理论计算方法, 介绍了镜面的制造方法。利用Zemax光学设计软件进行了光线追迹和优化设计, 结果显示光谱畸变<0.88%, 光谱弯曲<1/3探测器像元, 所有谱段的光学传递函数均大于0.8, 满足星载高光谱成像仪的技术要求。施密特系统结构简单, 仅含有一个非球面, 在大视场工作时具有像质优良和畸变小的特点, 且中心遮拦比小、体积紧凑, 适合未来大视场快焦比的大口径星载遥感应用。
Abstract
To meet the application demands of a wide field of view and fast focal ratio for an aerospace imaging spectrometer, a three-mirror folded Schmidt telescope using a freeform Offner convex grating spectrometer was designed to obtain a field of view 5°, focal ratio of 2, spectral range of 400-1 000 nm, and spectral resolution of 5 nm for a space hyperspectral imager. The expression of an axisymmetric anamorphic asphere Schmidt surface was given and calculated, and a manufacturing method was introduced. The optical system for a Schmidt spectrometer was designed and optimized using software Zemax. Results show that spectral distortion is less than 0.88%, the spectral smile is smaller than 1/3 pixel size, and the optical module transfer function is greater than 0.8. These imaging characteristics can meet the requirements of a space imager. The Schmidt system shows a simple configuration and uses only a single aspherical mirror. Because it possesses excellent imaging specifications, small distortion, small central obscuration, and a compact size, Schmidt is the best candidate for a space instrument with a large aperture, large field of view, and fast focal ratio.

王欣, 刘强, 舒嵘. 大视场快焦比施密特系统在星载光谱仪中的应用[J]. 光学 精密工程, 2019, 27(3): 533. WANG Xin, LIU Qiang, SHU Rong. Application of Schmidt optical system with wide-field of view and fast focal ratio to aerospace imaging spectrometer[J]. Optics and Precision Engineering, 2019, 27(3): 533.

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