双色测温法的分色曝光算法改进及验证  

Improvement and verification of two-color pyrometry by setting exposure time respectively

作　　者：邵力成[1] 周志军[1] 吉伟 郭隆真 陈立平[1] 刘奔 陶玉洁 SHAO Licheng;ZHOU Zhijun;JI Wei;GUO Longzhen;CHEN Liping;LIU Ben;TAO Yujie(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;SUMEC Complete Equipment&Engineering Co.,Ltd.,Nanjing 210018,China;Air Liquide(China)R&D Co.,Ltd.,Shanghai 200233,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]江苏苏美达成套设备工程有限公司,江苏南京210018 [3]液化空气(中国)研发有限公司,上海200233

出　　处：《热力发电》2018年第4期30-36,共7页Thermal Power Generation

基　　金：国家科技支撑计划项目(2015BAA04B03)~~

摘　　要：基于CCD相机的图像法测温技术有其独特优势,但存在标定过程繁琐、高温测量时测温范围窄等问题。为此本文结合3CCD相机R、G、B通道的曝光时间可各自设定的特点,基于双色测温法,提出了分色曝光双色测温法,建立了3CCD相机各通道信号值和曝光时间的关系,可换算得到任意曝光时间下的信号值。在黑体炉上的测温标定及验证结果表明:按分色曝光双色测温法处理的曝光时间组合,其有效测温范围拓宽了约140%;该方法在黑体炉上1 450~2 200℃的测温效果良好,相对误差均在±1.00%以内;在现场测温时可自由选择曝光时间,而不必重复黑体炉标定K值的过程,提高了CCD相机测温技术的实用性。The CCD camera-based image temperature measurement technology has its unique advantages,but it also has problems such as tedious calibration procedure and narrow measuring range for high temperatures.To solve these problems,this paper proposed an improved method called individual exposure two-color pyrometry based on the 3CCD camera,which can set appropriate exposure time of R,G and B channels respectively.The relationship between the signal value and the exposure time of each channel of the 3CCD camera was established,and the signal value of R,G and B channel at any exposure time can be derived.The calibration and test conducted in the black-body furnace showed that,the available temperature range was 140%wider than before and this method had a reasonable measuring accuracy within 1 450~2 200℃,with relative error of no more than±1.00%.Therefore,suitable exposure time can be chosen in practice without the calibration burden in black-body furnace repeatedly,thus the practicability of the CCD camera pyrometry was significantly improved.

关 键 词：双色测温法 3CCD相机 分色曝光 黑体炉标定 高温测量 曝光时间 

分 类 号：TK311[动力工程及工程热物理—热能工程]