中波红外光学系统被动无热化设计及测试  

Passive athermal design and measurement of MWIR optical system

作　　者：李华[1] 韩维强[1] 沈忙作[1] 

机构地区：[1]中国科学院光电技术研究所,四川成都610209

出　　处：《红外与激光工程》2009年第4期687-691,共5页Infrared and Laser Engineering

摘　　要：温度变化对红外光学系统的成像质量有很大影响。根据中波红外光学系统工作环境要求,分析了导致光学系统成像质量下降的主要因素,推导出同时消热差和消色差的材料组合公式,采用结构件为铝,光学材料为AMTIR-1和Ge组合消热差,设计了光学被动无热化中波红外光学系统,在-40～60℃温度范围内系统成像质量达到衍射极限,离焦量在一倍焦深以内。为实际考核集成了探测器后中波红外系统的无热效果,建立了无热化光学系统测试平台,对高温箱内的中波红外系统进行测试,采集探测器输出的数字图像,在3×3像素窗口内计算单像素的能量集中度,60℃时的单像素能量集中度下降到20℃的89.3%,测试结果表明:系统具有很好的成像质量和无热效果。The change of environment temperature will deeply influence image quality of middle wave infrared（MWIR） optical system. The main factors for declination of the image quality was theoretically analyzed, and the equation of athermal and achromatic simultaneity using different material combination was deduced. A passive athermal optical system was designed by using optical material AMTIR-1 and Ge with mechanical material （aluminium） in MWIR. Within- 40-60℃, the image quality could reach diffraction limit and defocus value was in one depth of focus. To evaluate athermal effect of optical system integrated with detector, a platform was established to test MWIR system, and the MWIR system in high temperature chamber was measured. The energy concentration degreeof single pixel in 3×3 pixel window was calculated after adopting the digital images output by the detectors. Energy concentration degreeat 60℃ will drop to 89.3% of the energy concentration degree at 20℃ .Measurement results show that the optical system has good image quality and athermal effect.

关 键 词：中波红外 光学设计 无热化设计 热测试 

分 类 号：TN21[电子电信—物理电子学]