一种基于控温黑体的红外实时校正技术  

Infrared real-time calibration technology based on temperature control blackbody

作　　者：朱辉[1] 张勇[1] 陈志学[1] 董期林[1] 刘万刚[1] 罗蓓蓓[1] 

机构地区：[1]西安应用光学研究所,陕西西安710065

出　　处：《应用光学》2014年第5期884-889,共6页Journal of Applied Optics

基　　金：国防预研支撑项目

摘　　要：二代扫描型热像仪的非均匀性校正(NUC)通常采用定点两点温度校正法或定点多点温度校正法,采用定点校正无法适应时间或环境的变化对探测器带来的影响,造成校正偏离,空间噪声增大。通过在成像光路中设置2个可控温的黑体完成探测器的实时校正,保证在不同时刻以及不同应用环境下,黑体的温度始终实时地跟随场景温度,校正系数实时更新,使非均匀性校正的输出误差有效降低。通过实际多个场景对比试验,采用传统定点校正,非均匀性噪声约为4.0,而该方法的噪声不大于2,有效降低50%。Non-uniformity correction(NUC)of 2nd generation scanning thermal imager usually utilizes the fixed two-point temperature calibration method or the fixed multi-point temperature calibration method.However,the fixed-point correction cannot adapt to the changes of the detectors caused by the environment or time,hence the calibration parameter is deviated and the space errors increase.We put forward a kind of real-time correction method by setting two controllable temperature blackbodies in the light path,and the temperature of the blackbody always followed that of the scene in real time.So the correction parameter was updated in real time to effectively reduce the output error.With some contrast tests of the different scenes,results show that for the traditional fixed point correction,the size of the nonuniformity noise is about 4.0,while adopting the method of this paper,the size of the noise is not greater than2,effectively reduces 50%.

关 键 词：红外热成像 非均匀性校正 实时校正 控温黑体 

分 类 号：TN219[电子电信—物理电子学]