环境对中波红外探测器测温精度的影响

为了分析环境辐射和大气吸收对红外辐射特性测量精度的影响,对基于中波红外探测器的红外测温进行了研究。首先,介绍了影响中波红外探测器测温精度的几种辐射能,根据测温模型得出了红外探测器像元灰度值和辐射照度之间的关系公式,并进一步推导出辐射测温的修正公式。以高精度面黑体为目标进行了测温实验,对红外探测器像元的灰度值进行修正并计算测温误差。结果显示,修正前、后测温误差的均方根分别为3.56℃和0.27℃,测温精度得到了显著的提高,表明该修正公式可准确地修正环境和大气吸收对中波红外探测器测温精度的影响。

Influence of environment on temperature measurement precision based on middle-wave IRFPA

In order to analysis the influences of environment radiation and atmosphere absorbing on the measurement precision, the infrared temperature measurement by using a middle-wavelength infrared detector is studied. Firstly, several environment radiations which influence the measurement precision of a middle-wave Infrared Focal Plane Array(IRFPA) are introduced, and the relation between the gray and the absorbed radiation of the infrared detector is deduced. Then the amending formulae of environment radiations are achieved. Using the blackbody as the measurement target, the measurement error are 3.56 ℃ and 0.27 ℃ before and after amendings, respectively, and the measurement precision is improved evidently. The results show that the amending formulae could modify the influences of environment radiation and atmosphere absorbing correctly.