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针对传统的辐射定标与校正方法存在的问题,研究提出了一种基于U形边框黑体视场光阑的红外成像辐射定标与校正技术。该技术可在不遮挡中心视场的情况下完成动态非均匀校正,因为边框黑体的温度是可控的,所以在非均匀校正的基础上可以进行红外成像系统的动态辐射定标,以修正热成像系统出厂辐射定标的漂移。算法执行时,将边框黑体视场光阑分别在高、低温下伸入视场,与原始辐射定标数据进行对比,计算出辐射定标的修正参数,修正补偿原始辐射定标查找表,减小动态辐射定标器的体积和质量,并避免辐射标定时对成像视场的遮挡。设计并搭建了基于U形边框黑体光阑的实验平台,该平台上的成像实验表明:校正效果明显,辐射定标修正后的测温误差小于0.5 K。
Aiming at the problems existing in traditional radiation calibration and calibration methods, a calibration and correction technique for infrared imaging radiation based on black-body field diaphragm with U-shaped frame is proposed. The technology can achieve dynamic non-uniform correction without blocking the central field of view. Because the temperature of the blackbody in the border is controllable, dynamic radiometric calibration of the infrared imaging system can be performed on the basis of non-uniform calibration to correct the heat Imaging system factory calibration radiation drift. When the algorithm is executed, the border blackbody aperture stops at the field of view at high and low temperatures respectively, and compared with the original radiation calibration data to calculate the correction parameters of the radiation calibration, and the compensation compensation original radiation calibration look-up table Small dynamic radiation scaler volume and quality, and to avoid the radiation calibration of the imaging field of view of the block. The experimental platform based on U-shaped border black-body diaphragm was designed and constructed. The imaging experiment on this platform showed that the calibration effect is obvious, and the temperature error corrected by radiation calibration is less than 0.5K.