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红外焦平面探测器阵列由于探测器工艺、环境冲击和长时间工作等因素将引起探测器响应的漂移,很大程度影响了热成像系统的成像质量。对于红外测温热像仪来说,会大大降低其出厂定标的准确性。针对红外辐射定标,考虑到探测器响应的非线性,在前期搭建的基于U形边框黑体视场光阑的红外成像系统基础上,研究了基于U形边框黑体光阑的三点定标修正方法,并与两点辐射定标方法进行了比较。实际定标测试实验结果表明:在25~65℃范围内,三点定标修正后的最大绝对误差和平均误差分别为0.126 6 K和-0.048 8 K,较原始定标的结果有明显的精度提升,说明三点定标修正方法算法有效,但三点定标修正与两点定标修正的结果相差不大。因此,一般情况下两点辐射定标修正方法足以适应辐射定标应用。
Infrared focal plane detector array due to the detector technology, environmental impact and prolonged work and other factors will cause the detector response drift, largely affected the thermal imaging system imaging quality. For infrared thermal imaging cameras, it will greatly reduce the accuracy of its factory calibration. Considering the non-linearity of the detector’s response to the infrared radiation calibration, a three-point calibration correction based on the U-shaped border blackbody aperture was studied based on the infrared imaging system based on the U-shaped border blackbody field diaphragm. Method, and compared with the two-point radiation calibration method. The experimental results of actual calibration test show that the maximum absolute error and the average error after three-point calibration are 0.126 6 K and -0.048 8 K respectively in the range of 25-65 ° C., which is obviously higher than the original calibration result Ascension, illustrate the three-point calibration method is effective, but the calibration of three-point calibration and the calibration of two-point calibration is not much difference. Therefore, in general, two points of radiation calibration calibration method is sufficient to adapt to radiation calibration applications.