HgCdTe红外焦平面阵列像素内灵敏度函数仿真  

The simulation of intra-pixel sensitivity for HgCdTe infrared focal plane array

作　　者：钟篱 苏晓锋[1] 胡伟达[1] 陈凡胜[1,2] ZHONG Li;SU Xiao-Feng;HU Wei-Da;CHEN Fan-Sheng(Key Laboratory of Intelligent Infrared Perception,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院智能红外感知重点实验室中国科学院上海技术物理研究所,上海200083 [2]国科大杭州高等研究院,浙江杭州310024 [3]中国科学院大学,北京100049

出　　处：《红外与毫米波学报》2021年第5期673-679,共7页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金项目(61975222)。

摘　　要：对于Fλ/d<2的欠采样成像红外搜索和追踪系统,点目标能量集中在单像素内。由于焦平面阵列像素内灵敏度(IPS:Intra-PixelSensitivity)存在空间非均匀性,会降低目标的能量和质心测量精度。传统的光点扫描实验测试和数值仿真方法可有效表征和分析IPS,但系统和模型复杂度高、效率低,且实验测试无法分析IPS空间非均匀性与探测器参数的关系。针对上述问题,提出基于蒙特卡洛方法的HgCdTe红外焦平面阵列IPS仿真模型,分析了IPS空间非均匀性的影响因素。结果表明,减小像素中心距或增大吸收层厚度,IPS的空间非均匀性减小;随波长增大,IPS的空间非均匀性增大。该仿真和分析对高能量集中点目标测量精度的提升具有重要参考意义。For the under-sampled imaging infrared search and tracking system which Fλ/d<2,the energy of point target was concentrated on a single pixel.Due to the spatial non-uniformity of intra-pixel sensitivity(IPS)for focal plane array,the calculation accuracy of energy and centroid for point target would be reduced.Light spot scanning test and numerical simulation could effectively characterize and analyze the IPS,but the system and model were highly complex and time-consuming,moreover,experimental tests couldn’t analyze the relationship between the spatial non-uniformity of the IPS and the parameters of photo-detector.Aimed at the above problem,Monte Carlo methods were used to simulate the IPS of HgCdTe infrared focal plane array,and the influencing factors of its spatial non-uniformity were analyzed.The results showed that the spatial non-uniformity of IPS can be reduced by reducing the pixel pitch or increasing the thickness of absorber.With the increase in wavelength,the spatial non-uniformity of IPS increased slightly.The results of simulation and analysis are of great significance for improving the measurement accuracy of high energy concentration point target.

关 键 词：像素内灵敏度 HGCDTE 红外焦平面阵列 非均匀性 蒙特卡洛方法 

分 类 号：TP732.2[自动化与计算机技术—检测技术与自动化装置]