红外窗口对封装黑体辐射理想度的影响及修正方法  

Influence of Infrared Window on the Radiation Ideality of Package Blackbody and Correction Method

作　　者：张镜洋 孟令琪 牟新竹 沈萍 绪升 ZHANG Jingyang;MENG Lingqi;MOU Xinzhu;SHEN Ping;XU Sheng(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]南京航空航天大学航天学院,南京211106

出　　处：《光子学报》2024年第7期153-165,共13页Acta Photonica Sinica

基　　金：国家自然科学基金(No.52206091);江苏省自然科学基金(No.52206091);航空动力创新工作站基金(No.HKCX2022-01-001)。

摘　　要：针对宽温域黑体有封装红外窗口介入而影响黑体理想度的问题,建立了面源黑体靶面热光耦合仿真模型,利用Monte-Carlo光线追迹法分析了窗口对黑体7.5μm~13μm波段表观辐射通量的影响规律及内因,提出并验证了符合实际表观辐射通量的定标温度修正方法。结果表明:定标温度为−50℃~+50℃时,定标温度越低于环境温度,定标温度与实际表观辐射通量对应的表观温度间正误差越大,反之则负误差越大,最大可达−4℃~+13℃,这是因为窗口存在增强杂散辐射与衰减靶面发射辐射正逆博弈影响表观辐射通量的效应。提出了关联环境温度与定标温度的定标温度修正方法,实验实测下该方法可使修正后的定标温度最大误差缩减50%以上,提升了基于封装黑体的红外定标精度。The blackbody is an ideal calibration target source for correcting the photoelectric conversion characteristics of infrared detectors.According to the theoretical radiation flux provided by the blackbody target surface,the detector can correct the quantitative relationship between the gray value of the output temperature field and the radiation flux,thus obtaining an accurate response gain coefficient.In order to meet the demand for real-time and accurate detection of targets with large temperature variations in fast-changing environments such as airborne,missile-borne,and space-borne scenarios,the wide-temperature-range blackbodies are typically vacuum-packaged by infrared windows to solve the problems of non-uniformity and low temperature dew and frost caused by large temperature differences in the environment.However,during calibration,the blackbody is affected by the attenuated target surface radiation and stray radiation from the window,there will be an error between the apparent temperature corresponding to the actual apparent radiation flux of the blackbody and the calibration temperature given by the measurement of blackbody surface.If the infrared detector still gives the calibration temperature according to the measured target surface temperature,it will affect the ideality of the blackbody and the calibration accuracy of the infrared detector.Most researchers consider the infrared window as a graybody and analyze the impact of environmental stray radiation reflected by the window on the infrared detector under high-temperature conditions,without systematically considering the influence of the spectral transmissivity,emissivity and reflectivity of the window on blackbody calibration technology.Therefore,in this paper,starting from the window spectral characteristics,aiming at the problem that wide-temperature blackbody packaged with infrared window affects the blackbody ideality,the influence law and internal causes of Ge and BaF2 typical windows on the error between the calibration temperature and the

关 键 词：光学窗口 黑体辐射 红外探测器定标 MONTE-CARLO方法 温度修正 

分 类 号：TK124[动力工程及工程热物理—工程热物理]