红外焦平面探测器辐射非均匀性校正方法  

Non-uniformity rectification methods of IRFPA detector radiation

作　　者：段东[1] 沙晟春[1] 张双垒[1] 黄思婕[1] 陈凡胜[1] 

机构地区：[1]中国科学院上海技术物理研究所,上海200083

出　　处：《红外与激光工程》2012年第10期2621-2624,共4页Infrared and Laser Engineering

摘　　要：大面阵红外焦平面探测器的应用日趋广泛,而面阵的不断增大会导致很多不可避免的成像误差,对最终成像效果有较大影响,有必要对其进行校正。在红外焦平面探测器输出信号参数的测试中,针对圆形冷屏限制的红外焦平面分析比较了两种辐射非均匀性校正方法,一种方法为建立光敏元立体角的数学模型,用SolidWorks和MATLAB等软件求出这些立体角从而得到校正因子;另一种方法为从光敏元的视场角ω′出发,按辐射光照度以cos4ω′衰减的规律进行校正。以320×320红外焦平面探测器为例,从面阵中选取均匀性较好的若干行作为样本,对其测试数据进行校正。分析表明,两种方法校正后的曲线较为平直,但第二种方法的校正效果比较理想,可见视场角校正法对数据的非均匀性有较大改善。因此,为了真实地反映探测器的非均匀性,需要对像元辐射通量进行校正。Because more and more IRFPA detectors are used, the increase of the pixel area size results in many inevitable imaging errors, which affects the image, it＇s necessary to rectify the imaging errors. In the test of IRFPA detector output parameters, two ways were analyzed and compared to rectify the radiation uniformity for infrared FPA under limitation of circular cold shield. One way was to build the mathematical model of pixels＇ solid angle, the rectification factor could be gotten by computing solid angle using Solidworks and MATLAB. Another way was considering the angle of pixels＇ field, the light intensity step down according to MATLAB. Data of some rows＇ pixels of the 320 ×320 IRFPA were rectified and analyzed. The curves of data become smooth and straight after correction, and the second rectification result is better. The second rectification method can significantly improve the non-uniformity of data. So rectifying radiation flux is necessary in order to describe the non-uniformity accurately.

关 键 词：非均匀性校正 红外焦平面 立体角 视场角 

分 类 号：TN21[电子电信—物理电子学]