中文摘要：

军事和安全应用都需要利用红外探测技术来进行目标跟踪和搜索．由于红外或热成像系统探测的目标辐射能量低，因此需要光学系统具有强的集光能力；另外，用凝视方式可以获取大场景红外图像以去除传统的机械扫描装置，这要求红外光学系统：具有足够大的视场．该工作研究的光学系统视场大于60×3．5度，F数F／1-F／2．5．采用了离轴三反射镜光学系统，系统结构简单，成像质量达到衍射极限．

英文摘要：

Infrared optical systems are widely applied in military and public security fields. Since the radiation energy of infrared objects is lower, the corresponding optical system must have a large numerical aperture, in order to increase the system exploring sensitivity, and it also needs to provide a large field of view in order to remove the traditional scanning mechanism. This study described the optical design of an infrared system with a field of view of 60×3.5 degrees and an F-number of F/2.5-F/1. The design is based on a fast unobscured three-mirror anastigmatic （TMA） system. The final optical system is a three-mirror unobscured system. It has a simple structure and the quality of image arrives at the diffraction-limitation at infrared wavelengths.