针对长波制冷式384×288焦平面探测器, 设计了一款大变倍比长波红外连续变焦距光学系统。整个系统由8片透镜及两个反射镜构成, 工作波长范围为7.7～9.3 μm, F数为3, 满足100%冷光阑效率, 变倍比为25:1。采用CODE V光学设计软件进行优化设计, 设计结果表明, 该系统具有结构简单、变倍比大、体积小、像质好等优点。

An LWIR continuous zooming system based on long-wave cooled 384×288 focal plane array (FPA) detector with large zooming range is described in this paper.. The system consists of eight lenses and two reflectors, the operating wavelength is 7.7-9.3 μm, F number is 3, and the zoom ratio is 25:1, which satisfies 100% cold shield efficiency. The system is optimized by using the CODE V optical design software. The design results proved that the system has the advantages of simple structure, large zooming ratio, small size and excellent image quality.