一种变焦红外成像测温方法  

Temperature measurement method based on zoom infrared imaging

作　　者：李科[1] 朱金华 邵先军 孙子林 姜凯华 LI Ke;ZHU Jin-hua;SHAO Xian-jun;SUN Zi-lin;JIANG Kai-hua(Tianjin Jinhang Institute of Technical Physics,Tianjin 300308;State Grid Zhejiang,Hangzhou 310014,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China)

机构地区：[1]天津津航技术物理研究所,天津300308 [2]国网浙江省电力有限公司,浙江杭州310014 [3]国网浙江省电力有限公司电力科学研究院,浙江杭州310014

出　　处：《激光与红外》2024年第8期1272-1276,共5页Laser & Infrared

基　　金：国家电网公司总部科技项目(No.5500-202119489A-0-5-ZN)资助。

摘　　要：以适合大风、高温等极端天气条件下使用的固定安装式变焦测温热像仪为背景,针对连续变焦热像仪的测温问题,提出了一种变焦红外成像测温方法,在文中给出的定焦热像仪工程测温方法基础上,扩展了焦距维度,构建了变焦热像仪测温的多项式模型,并通过最优化方法计算反演参数,从而得到不同焦距时的测温结果,进一步给出了变焦测温时的数据标定方法。基于高精度黑体对自主研发的变焦热像仪进行了数据标定,分析了不同焦距时的测温精度,并进行了实验室环境和户外环境的观测试验。试验结果表明,不同焦距都可获得高精度的测温结果,达到国标要求的±2℃精度。该项成果可以在各型变焦热像仪上推广应用,提高对高压线类远距离目标的测温精度。A zoom infrared imaging temperature measurement method is proposed in the context of a fixed-mounted zoom temperature measurement thermal imaging camera suitable for use in extreme weather conditions,such as high winds and high temperatures,in order to address the temperature measurement problems of a continuous zoom thermal imaging camera.Based on the engineering temperature measurement method of fixed focus thermal imagers provided in the article,the focal length dimension is expanded to construct a polynomial model for temperature measurement of zoom thermal imagers,and the inversion parameters are calculated through optimization methods to obtain temperature measurement results at different focal lengths.Furthermore,a data calibration method for zoom temperature measurement is provided.A self-developed zoom thermal imager is calibrated based on high-precision blackbody data,and the temperature measurement accuracy at different focal lengths is analyzed.Observation experiments are conducted in both laboratory and outdoor environments.The experimental results show that high-precision temperature measurement results can be obtained with different focal lengths,reaching the±2℃accuracy required by the national standard.This achievement can be promoted and applied to various types of zoom thermal imagers,improving the temperature measurement accuracy for long-distance targets such as high-voltage lines.

关 键 词：红外成像 连续变焦 数据标定 测温 

分 类 号：TN219[电子电信—物理电子学] TH74[机械工程—光学工程]