大气与环境影响分析的红外比色测温方法

传统的比色测温法通常利用可见光和近红外波段,对距离较近的高温目标具有较高的测量精度,而对距离较远的中低温目标无法精确测量。针对传统比色方法适用局限性,提出考虑大气和环境影响的红外比色测温方法,建立基于中波红外相机的比色测温实验系统。首先使用标准黑体进行中波红外相机和比色系统单波段定标;然后推导加入环境辐射参数的比色测量模型,进而建立新的目标辐射亮度比值与目标温度间的函数关系;最后,进行了实验室内自制灰体目标温度测量实验,验证了提出方法的可行性。实验表明:在实验温度范围内,温度绝对误差和相对误差分别小于4 ℃和6.7%,目标辐射亮度测量精度高于10%,考虑大气与环境影响的比色测温方法可实现中低温目标温度精确测量。

Middle infrared colorimetric temperature measurement method considered influence of atmosphere and ambient

Traditional colorimetric temperature measurement method commonly used in visible and near infrared band, can only get high precisions when measuring near high temperature target, and can't get high precisions when measuring far low-middle temperature target. Aimed at the limitations of traditional method, infrared colorimetric temperature measurement method was put forward considering atmosphere and ambient radiance, an colorimetric temperature measurement system based on middle infrared camera was established. First, standard blackbody was used for calibration of middle infrared camera and single-band of colorimetric system; then colorimetric temperature measurement model with ambient radiance parameter was deduced, a new function between ratio of two radiances and temperature of target was established; finally, measurement temperature of home-made gray-body in the laboratory was made, the feasibility of proposed method was verified. Experiments show that: in the experimental temperature range, absolute error of temperature measurement is less than 4 ℃, the temperature relative error is less than 6.7%, the measurement accuracy of radiation intensity is higher than 10%. The colorimetric temperature measurement method considering atmosphere and ambient is greatly superior to traditional method.