被测表面失焦对红外测温的影响研究

Research on Effect of the Infrared Temperature with Surface Defocus

由于探测位置安装的限制,被测表面会部分或者全部失焦,这将对红外测温产生影响,利用反向蒙特卡洛法对物平面的平行离焦和旋转失焦两种情况进行了模拟,并且分析了相机分辨率和壁温分布对测温的影响,得出当物平面平行离焦时,随着离焦距离的增大,红外测温的误差也越大,当物平面旋转失焦时,随着旋转角度的增大,红外测温的误差也越大,随着CCD相机分辨率的增加,离焦对红外测温的影响越来越小,但分辨率提高到一定程度后,分辨率的影响几乎可以忽略,此外温度分布也对红外测温也有影响,温度变化越剧烈,离焦时测温误差越大。

Due to the limit of the installation measurement surface will lose focus. This will position detection, some or all parts of the affect the infrared temperature measurement. In this paper, backward Monte-Carlo method is used to simulate the parallel and rotation defocus. At the same time, the effect of the camera resolution and the wall temperature distribution on infrared temperature measurement is analyzed. It concludes that the measurement errors are greater when defocus distance and rotation angle increase. With increasing resolution of the CCD camera, the infrared temperature measurement get smaller and smaller, but when the resolution reaches to a certain extent, the effect of the camera resolution is almost negligible. In addition, the temperature distribution also affects the infrared temperature measurement. The more dramatic change in temperature, the greater the measurement error is.