红外焦平面区域选取对辐射定标的影响分析

Analysis of the Influence of Infrared Focal Plane Region Selection on Radiometric Calibration

红外辐射定标是获取目标红外辐射特性的基础技术之一。辐射定标精度对后续目标的辐射特性测量具有重要的影响。针对中波红外辐射定标时探测靶面像元大小的选取,研究了其对辐射定标中系统线性度的影响。基于640×520元中波红外焦平面阵列,选取中心像元、中心100×100区域、中心200×200区域以及全靶面区域进行了研究。在高温段,中心20×20区域的随机误差为5.27%,中心100×100区域的最小误差为0.01%。在低温段,中心20×20区域的随机误差为1.78%,中心100×100区域的最小误差为0.45%。在一定靶面区域内,随着所选靶面的增大,误差逐渐减小。研究结果对红外探测器辐射定标靶面的选取具有一定的工程应用价值。

Infrared radiometric calibration is one of the basic technologies to obtain the infrared radiation characteristics of the target.The accuracy of radiation calibration has an important influence on the subsequent target's radiation characteristic measurement.Aiming at the selection of the pixel size of the detection target during the mid-wave infrared radiation calibration,the influence on the linearity of the system during the radiation calibration is studied.Based on 640×520 mid-wave focal plane array,the central pixel,100×100 central area,200×200 central area and the whole target area are selected for research.In the high temperature section,the random error in the 20×20 area is 5.27%,and the minimum error in the center pixel 100×100 area is 0.01%.In the low temperature section,the random error of the 20×20 area is 1.78%,and the minimum error in the center pixel 100×100 area is 0.45%.In a certain target area,as the selected target surface increases,the error gradually decreases.The research results have certain engineering application value for the selection of infrared detector radiation calibration target surface.