介绍了一种长波红外双视场扫描型光学系统。描述了扫描型双视场光学系统的设计模型, 利用摆镜扫描实现视场扩展, 采用光路中径向切入镜组实现变倍比为2.5倍的双视场设计, 其F数为1.67, 摆镜扫描角度为±6.5°。光学系统采用Ge 、ZnS两种红外材料, 使用非球面技术很好地校正了系统像差, 传函接近衍射极限, 在-40～+60 ℃环境温度范围内系统具有良好的成像质量, 可用于机载或车载光电系统。

A long-wave infrared (LWIR) dual-field scanning optical system is introduced.The design model of dual-field scanning optical system is depicted.Through the oscillating mirror scanning the field of view (FOV) is enlarged.By inserting vertically a set of lens in the system the dual-FOV design for 2.5 zoom ratio is realized.The F number is 1.67 and the scanning angle of the oscillating mirror is ±6.5°.The optical system is designed by using two common optical materials Ge and ZnS.The aberration can be well corrected by use of non-spherical technology.The MTF approaches the diffractive limit and the system has fine image quality in the temperature range from -40 ℃ to 60 ℃.It can be used in the electro-optical system onboard the aircrafts and ground vehicles.