根据比尔定律,物体向周围空间的热辐射量分布与辐射方向成余弦关系。 由于被测目标与探测器的相对位置关系,导致探测器接收到的红外辐射量存在差异,对红外辐射测温带来误差。为解决这个问题,计算目标空间位置 与探测器角系数之间的定量关系;建立红外辐射量的理论修正模型,通过建立的修正模型对目标辐射到探测器的辐射量进行定量补偿; 利用红外像探测器对均匀光源辐射量进行采集实验来验证上述方法。实验结果表明,随着探测器与均匀光源相对角度的增加,探测器 在不同θ角下对均匀光源进行测量的灰度值明显降低。对探测器测量值进行补偿后,相对误差小于4%。此方法提高了红外辐射 测温的精度,提高了测试技术的稳定性,对红外辐射测温的误差修正具有一定的指导价值。

According to Beer’s principle, the distribution of heat radiation of an object to the surrounding space is cosine to its radiation direction. Consequently, obvious differences among the received infrared radiation is ubiquitous and even results in the error of infrared radiation temperature measurement, owing to the relative position relationship between the measured target and detector. To address the issue, the relation of target position to the angle coefficient of detector is firstly characterized quantitatively. A modified model of the amount of infrared radiation is subsequently proposed. Through the modified model, a quantitative compensation scheme for the amount of detector radiation is implemented from target radiation. Moreover, to test the reliability of the proposed method, an experimental measurement to derive the amount of radiation from uniform light is carried out by using the infrared detector. The results show that as the relative angle between the detector and uniform light increases, the gray values from the measurement of detector to uniform light under different θ-angles remarkably decreases. The relative error is lower than 0.04 after the quantitative compensation for the measurement of detector. The proposed method does improve the accuracy of infrared radiation temperature measurement and enhance the stability of test technology. It can provide a guidance for the error correction of infrared radiation temperature measurement.