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.%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.
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