制冷型被动式消热差红外光学系统设计  

Passive athermalization design of a cooled infrared optical system

作　　者：李康 周峰[2] 王保华[1] 宫辉[1] 郑国宪[1] LI Kang;ZHOU Feng;WANG Bao-hua;GONG Hui;ZHENG Guo-xian(Beijing Institute of Space Mechanics and Electricity,Beijing 100076,China;Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京空间机电研究所,北京100076 [2]北京邮电大学,北京100876

出　　处：《中国光学（中英文）》2023年第4期853-860,共8页Chinese Optics

基　　金：高分辨率对地观测系统重大专项(民用部分)。

摘　　要：在大温差条件下,由于温度剧烈变化导致红外光学系统成像质量变差。用于机载林火监测的大视场中波红外相机工作环境变化剧烈,对杂散辐射要求较高。为保证光学系统在要求的大视场和大温差条件下具有稳定的性能和良好的成像质量,通过基于消热差的设计方法和基于噪声等效温差的杂散辐射综合评价方法,设计了一套制冷型中波红外光学系统。该光学系统由6片透镜和1片滤光片组成,工作波段为3.7~4.8μm,F数为2.5,焦距为62.5 mm,视场为14.36°×10.87°,探测器采用640×512阵列中波制冷型探测器,通过采用硅、锗材料组合,合理分配光焦度,实现了消色差和消热差设计,通过冷反射优化和冷光阑匹配设计,较好地抑制了系统的杂散辐射噪声,通过引入少量非球面优化,在满足指标要求的情况下,对高阶像差进行了校正。结果表明,光学系统在−55~+70℃温度范围内,成像质量稳定良好。Under conditions with large temperature differences,the imaging quality of an infrared optical system will deteriorate due to severe temperature changes.Large field-of-view medium-wave infrared cameras for airborne forest fire monitoring work in drastically changing environments,so the optical system has high requirements for stray radiation.In order to ensure that the optical system performs stably and with good imaging quality in the large field-of-view and the required large temperature range,a cooled medium-wave infrared optical system is designed based on athermalization and the comprehensive evaluation method of stray radiation based on noise equivalent temperature difference.The optical system consists of 6 lenses and 1 filter with working wavelength of 3.7−4.8μm,F-number 2.5,focal length 62.5 mm,and field of view 14.36°×10.87°,respectively.The pixel resolution of the medium-wave cooled detector is 640×512.By using a combination of silicon and germanium materials and reasonably distributing the optical power,achromatic aberration and athermalization designs are realized.Through cold reflection optimization and cold aperture matching,stray radiation noise in the system is well-suppressed.By a bit of aspheric optimization,higher-order aberrations are corrected based on the requirements.The results show that the imaging quality of the optical system is stable and good in the temperature range of−55~+70℃.

关 键 词：中波红外 制冷型探测器 消热差 冷反射 

分 类 号：TN216[电子电信—物理电子学]