本文设计了一种可以兼顾远近距离的紧凑型武警用红外热像仪光学系统，给出了一个设计实例，系统工作波段为 8～12 .m，中心波长为 10 .m，长焦距为 150 mm，短焦距为 50 mm，F数为 1.1，可匹配像元数为 384×288、像元大小为 17 .m×17 .m的非制冷红外焦平面探测器。系统通过变倍组的轴向移动实现变焦，通过引入二元光学面和非球面减小成像系统体积，减轻重量，提高成像质量，设计结果表明，该热成像系统取得了良好的成像，可用于火灾消防救援、森林防火、夜间侦查、边防监控等工作。

A compact thermal imaging system, operating over both near and far distances, for armed police is introduced. A design example is proposed. The working band is 8–12 .m, the center wavelength is 10 .m, the long focal length is 150 mm, the short focal length is 50 mm, and the F number is 1.1. The system can match the performance of an uncooled focal plane infrared detector with a pixel number of 384.288 and a pixel size of 17 .m.17 .m. The system realizes zooming by the axial movement of the zoom group. By using binary optical surface and aspheric surface, the volume and mass of the imaging system are reduced, and the image quality is improved. The design results show that the thermal imaging system has appropriate image quality, which is suitable for fire rescue, fire prevention, night detection, and border monitoring.