大相对孔径长波红外光学系统无热化设计

Athermalization of long-wave infrared optical system with large relative aperture

针对目前许多军工仪器红外成像系统的结构简单、体积小、质量轻的无热化设计要求,采用光学被动式方法对8μm～12μm波段、相对孔径为1的红外光学系统进行了无热化设计。具体光学系统参数:F=1,f=60mm,2ω=11.4°。设计结果:在-40℃～60℃工作范围内,该系统的调制传递函数(MTF)接近衍射极限,空间分辨率在20lp/mm处,中心视场传函接近0.7,边缘视场传函大于0.6。其设计结果满足系统的无热化设计要求。

Aiming at the athermal design requirements of infrared imaging systems for defense application such as simple structure,small size and light weight,this paper proposed an infrared optical system（8 μm～12 μm） with passive optical athermalization design.The parameters of the optical system was F=1,f=60 mm and 2ω=11.4°.The analysis of results showed that the modulation transfer function（MTF） approached to the diffraction limit,the MTF was up to 0.7 in the central field of view（FOV） and better than 0.6 in the marginal FOV at the spatial frequency of 20 lp/mm in the temperature range of-40℃to ＋60℃.The results meet the athermalization requirements of the system.