为了实现对空间暗弱目标的探测, 设计了大孔径可见光探测相机的光学系统。该系统焦距为350 mm, 相对孔径为1/1.6, 全视场角为3.2°, 波段范围为450～950 nm。介绍了可见光探测相机的构成, 确定光学系统的结构形式为马克苏托夫两反射系统, 主次镜均采用球面镜。采用CODE-V光学设计软件对系统进行了优化设计。给出了像质评价及热分析结果。设计结果表明, 该可见光探测相机光学系统各视场点列图基本是圆形, 全视场内80%能量的弥散斑直径均小于26 μm, 最大畸变小于0.05％, 倍率色差小于5 μm, 满足探测要求。

In order to realize the detection of dark and weak target in space, the optical system of visible light detection camera with a large aperture is designed. Its effective focal length is 350 mm, F-number is 1/1.6, field of view is 3.2°, and working wavelength ranges from 450 to 950 nm. The structure of the visible light detection camera is described, and the structure form is determined to be Maksutov′s two reflection system whose primary and secondary mirrors are spherical. CODE-V optical design software was used to iptimize the optical system. The image quality evaluation and thermal analysis result are presented. The result shows that each field spot diagram is nearly circular, 80% energy encircled is within the spot diameter of 26 μm, maximum distortion is less than 0.05% and lateral color is less than 5 μm, which meet the requirement of detection.