基于CCD图像传感器的高温场测量仪设计与实现

Design and Implementation of High-Temperature Field Measuring Instrumentation Based on CCD Image Sensor

设计并实现了一种由彩色CCD、图像采集卡、计算机和测量软件组成的高温场测量仪。该测量仪利用比色测温原理计算并显示高温辐射体的表面温度场分布,通过自动调节进光量扩大CCD测温范围,利用黑体炉标定实验校正CCD光谱响应特性非理想带来的测温误差,构建辐射能衰减补偿器对受烟雾干扰的测温结果进行补偿校正。对工业现场进行测试,最大绝对误差为13.6 K,最大相对误差为1.42%,平均每幅辐射图像计算时间为0.127 s。测试结果表明,该测量仪具有较高的精确性和可靠度,符合工业生产对高温检测的要求。

This paper describes the design of a high-temperature field measuring instrumentation, which is composed of an optical lens, a color CCD camera, an image grabbing card, a computer and associated measuring software. Based on the two-color thermometry, the temperature distribution of the measured object can be calculated and then displayed on the screen. A method of automatically adjusting the amount of light is used to expand temperature measuring range of CCD, and blackbody furnace calibration experiments are adopted to calibrate the measurement errors caused by the non-ideal spectrum response character of CCD image sensor. Finally, an attenuation equalizer of radiation is built to compensate measuring temperature errors caused by smog interference. By testing on the industrial field, the maximum absolute error is 13.6K, the maximum relative error is 1.42%, and the average computing time of each piece of radiation image is about 0.127 seconds. The test indicates that the measuring instrumentation meets the high-temperature detecting requirements of industrial production due to its high accuracy and reliability.