红外系统无热化检测仪的光学系统设计

为了检验红外导引头光学系统无热化设计的效果,采用光学检测的方法对被测系统在一定的温度范围内焦点位置的偏移进行评估.详细介绍了长波红外无热化检测仪的原理,对检测仪光学系统中的各个组成部分,包括高低温箱窗口玻璃、平行光管和红外显微物镜,进行了深入的讨论.用CODEV重点设计了一个工作在8～12μm波段,数值孔径为0.25,放大倍率为2倍,焦距80mm,全视场为12mm的红外显微物镜.最后对设计结果进行了分析,给出了系统的调制传递函数曲线和场曲畸变图,表明光学系统的像质满足使用要求.

The optical system design for evaluating equipment of IR athermal optical system

In order to test the effect of athermal design for the infrared seeker of optical system,the method of optical inspection was used for the offset assessment of an detected optical system’s focal shift in the measured temperature range. Firstly,the theoretical basis of long-wave infrared athermalizing detector was described, and each component in its optical system such as the window glass of the high and low gimbals,collimator and IR microscopic objective was discussed. Then an infrared microscopic objective was designed,which can work at 8 ～ 12 μm waveband with numeric aperture of 0. 25,image magnification of 2,focal length of 80 mm and full field of view of 12 mm. Finally,the results of the design were analyzed. MTF and field curvature/distortion of the optical system show the better performance of the optical system.