介绍了一种高分辨率红外双视场光学系统设计，该光学系统采用二次成像的光学结构形式和切换式的视场变倍方式，该系统工作波长为3～5 μm，F数为2，变倍比为4倍，采用了像元尺寸15 μm的制冷式640×512高分辨率红外探测器。设计结果表明，双视场模式下均可获得较好的光学性能，最后给出了系统的了冷反射和公差分析结果。

A high resolution, dual field-of-view optical system is introduced. The optical system chooses re-imaging optics configuration and rotate-in mode, the operating waveband of the system is 3～5 μm, F/# is 2, and the zoom ratio is 4×. A 640×512 staring cooled infrared detector with 15 μm pitch is used in this system. The design results proved that this system has high image quality in both field-of-view, and the analysis of narcissus and tolerance are listed in the end.