考虑积分时间变量的红外系统辐射响应定标  被引量:23

Integration time as variable for radiometric calibration of infrared system

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作  者:罗茂捷[1,2] 周金梅[1] 傅景能[1,2] 廖胜[1] 

机构地区:[1]中国科学院光电技术研究所,四川成都610209 [2]中国科学院大学,北京100049

出  处:《红外与激光工程》2013年第1期36-40,共5页Infrared and Laser Engineering

基  金:国防预研项目

摘  要:辐射定标是红外系统辐射特性测量的基础。文中采用间接扩展源法对红外系统进行定标,分析了红外焦平面阵列探测元的响应模型以及响应特性与目标黑体辐射、积分时间的关系。提出了采用最小二乘法拟合得到红外焦平面像元响应灰度值对辐射量和积分时间的响应函数的定标算法。通过分析不同环境温度下的响应函数,进一步验证了其有效性。该方法可简化定标过程,节省定标时间。定标方程不仅可用于定量分析辐射定标的影响因素,而且有利于动态范围较大时的辐射测量。Radiometric calibration is very important for radiation characteristic measurement of the infrared system. The indirect calibration system was adopted, which was equipped with the collimator collected with the area blackbody as the extended radiant source. Firstly response model of the infrared focal plane arrays and the response characteristics related with the blackbody radiation and integration time were analyzed. Then through the least square fit method, response function of pixel respon gray value versus target radiation and integration time was demonstrated. Finally, the response function at different ambient temperature was compared with the former function, which further verified the effectiveness of the equation. This method can simplify the calibration process and save time. Besides, the calibration equation can be used to conduct quantitative analysis on impact factors of the calibration, and measure radiance in a wide dynamic range.

关 键 词:辐射定标 积分时间 响应模型 红外辐射 

分 类 号:TN21[电子电信—物理电子学]

 

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