三视场红外搜索光学系统的设计

 设计一款实际工程应用的红外三视场光学系统，其中大中视场利用透镜组切换变倍，小视场和大视场利用反射镜切换变倍。设计中采用二次成像的方式，3个视场共用二次成像透镜组,保证100％冷屏效率，减小第1片透镜的过口径。同时，采用非球面技术校正系统的球差和彗差，通过光学设计软件CODE V仿真，得出最大的点列斑为11 μm左右，并且MTF接近衍射极限，成像质量完全满足使用要求。最后，该系统利用反射镜折叠光路实现了系统结构紧凑、体积小的特点。

Infrared searching optical system with three-field of view

A kind of optical system with three-field of view for practical application was designed. The switch between wide and middle FOV was realized by using lenses group, and the switch between narrow and wide field was actualized by using mirrors. Three-field of view shared secondary imaging lens group, and the secondary imaging technique was used in the system design in order to endure 100% cold shield efficiency and reduce the diameter of the first lens. The technology for aspheric lenses was introduced to improve the imaging quality by correcting spherical aberration and coma. Then the performance of optical system was analyzed by CODE V software. The max spot was less than 11 μm and MTF approached to diffraction limit. The results show that the image quality of optical system reaches application requirements. In addition, compact structure and light weight are the features of the system.