空间遥感相机的空间分辨率、时间分辨率以及光谱分辨率不断提高，相机的观测谱段也得到了拓展，实现了多谱段观测。针对多谱段观测需求，通过计算以及光学设计软件设计研究了可见光与红外一体化光学系统。可见光部分系统焦距为6000 mm，F数为11.8，波段为400~900 nm。红外部分系统焦距为1280 mm，F数为2.5，波段为3000~5000 nm，两个系统视场均为1.4°×0.6°。可见光波段系统与红外波段系统共用前四片反射镜，五镜为二向分色镜，将可见光反射至五镜上方的时间延迟积分CCD中，红外波段透过五镜至后方校正镜组。整个系统无色差，结构较为紧凑，可见光与红外部分成像质量均达到要求。

The spatial resolution, time resolution and spectral resolution of the space remote sensing camera are improved gradually, the spectral band for observation of the camera is also extended and the multispectral observation is realized. The design of visible and infrared integrative optical system is studied based on the need of multispectral observation. The design is accomplished through calculation and an optical design software. In this design, the system focal length of the visible part is 6000 mm, F number is 11.8 and the wavelength band is 400~900 nm. The system focal length of the infrared part is 1280 mm, F number is 2.5 and the wavelength band is 3000~5000 nm. The field of view is 1.4°×0.6° for both of the systems. The visible band system and the infrared band system share the first four mirrors, the fifth is a dichroic mirror and reflects the visible light to the time delayed and integration CCD which is over the fifth mirror. The infrared light passes through the fifth mirror to the rear lens set for correction. The whole system has no color aberration, its structure is compact, and the image quality for visible and infrared is up to par.