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.