双波段比色测温技术及实验测试

Dual waveband colorimetric temperature measurement technology and experiment

温度是自然界最重要的物理量之一,在不知道被测目标发射率的情况下,为了精确测量中低温(50～400℃)物体的真实温度,建立了双波段比色测温的实验系统。首先,根据双波段比色测温法的实验原理选择合适的实验器件,并对实验器件进行校准,用工程软件进行离散数据的曲线拟合,即对实验器件进行标定。然后,在实验器件被标定的基础上进行实验测量,即用设定温度的面源黑体(50～400℃)作为被测目标来采集数据。最后,将实验数据的计算结果(即被测物的实验真温)与设定温度进行比较,找出误差存在的原因和提出改进方法。实验结果表明:此实验系统是完全可行的,且当实验系统的标定置信度为0.95时,物体的真实温精度误差为5℃。搭建的双波段实验系统能较为精确地测量中低温物体的真实温度。

The temperature is one of the most important physical properties in nature. In order to realize accurate measurement of the temperature of low-middle temperature objects （ 50 -400 ℃） , a system of dual waveband colorimetric temperature measurement is established with which the emissivity of the measured target is not needed to be accurately known. Firstly, based on the dual waveband colorimetric thermometry, this system needs to choose the devices, and then the collected data are used to fit curve or experimental devices are calibrated by RE-SOFT. After the devices are calibrated, the blackbody with given temperature＇s （50 -400 ℃ ）is measured as a reference. By comparing the set temperature with the measured data, the cause of errors is studied and analyzed. Experimental results indicate that this experiment system is feasible and the accuracy is 5 ℃ when calibrated confidence is 0.95. It can satisfy the accurate measurement requirement for low-middle temperature＇s objects.