折反射中波红外探测无热化成像系统设计分析

系统研究分析了红外光学系统中各个光学参数随温度变化的影响情况,根据红外硫系光学材料折射率温度系数较小的特点,并结合折反射结构良好的消热差特性,应用Code-v光学设计软件设计了一种折反式中波红外探测无热化成像系统,系统工作波段为3.7～4.8 m,焦距为109.7 mm,全视场角为6.4,F/#为2.0,满足100%冷光阑效率,采用锗、硫化锌和硫系玻璃AMTIR1三种红外材料,设计结果表明,该系统在低温-40 ℃、高温60 ℃时的成像质量和常温20 ℃的成像质量变化不大,取得了良好的成像性能,可匹配像元尺寸为30 m,像元数320256的凝视型焦平面阵列中波红外探测器。

Design and analyse on catadioptric MWIR athermal imaging system

The temperature influence of each parameter in infrared detection imaging system was analyzed in the paper.Benefitting from infrared chalcogenide glasses less index temperature coefficient and catadioptric configuration excellent thermalization performance, a catadioptric MWIR detection thermalization imaging system by Code-v optical design software was presented.The working wavelength is 3.7-4.8 um,effective focal length is 109.7 mm,field of view was 6.4,F/# is 2.0 and cold shield efficiency was 100%.The design results indicate that the image quality in-40 ℃and 60 ℃have little changed, which compared with in 20 ℃.The system is compatible with staring focal plane array MWIR detector which has a format of 320256 and the pixel pitch of 30 um.