Fu Tairan, Liu Jiangfan, Duan Minghao, Zong Anzhou
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Rev Sci Instrum. 2014 Apr;85(4):044901. doi: 10.1063/1.4870252.
Temperature measurements are important for thermal-structural experiments in the thermal radiation heating environments such as used for thermal-structural stress analyses. This paper describes the use of multicolor pyrometry for the measurements of diffuse surfaces in thermal radiation environments that eliminates the effects of background radiation reflections and unknown emissivities based on a least-squares algorithm. The near-infrared multicolor pyrometer had a spectral range of 1100-2400 nm, spectrum resolution of 6 nm, maximum sampling frequency of 2 kHz, working distance of 0.6 m to infinity, temperature range of 700-1700 K. The pyrometer wavelength response, nonlinear intensity response, and spectral response were all calibrated. The temperature of a graphite sample irradiated by quartz lamps was then measured during heating and cooling using the least-squares algorithm based on the calibrated irradiation data. The experiments show that higher temperatures and longer wavelengths are more suitable for the thermal measurements in the quartz lamp radiation heating system. This analysis provides a valuable method for temperature measurements of diffuse surfaces in thermal radiation environments.
在热辐射加热环境（如用于热结构应力分析的环境）中进行热结构实验时，温度测量非常重要。本文介绍了在热辐射环境中使用多色高温计测量漫反射表面的方法，该方法基于最小二乘法算法消除了背景辐射反射和未知发射率的影响。近红外多色高温计的光谱范围为1100 - 2400 nm，光谱分辨率为6 nm，最大采样频率为2 kHz，工作距离为0.6 m至无穷远，温度范围为700 - 1700 K。对高温计的波长响应、非线性强度响应和光谱响应都进行了校准。然后，根据校准后的辐照数据，使用最小二乘法算法在加热和冷却过程中测量了石英灯辐照下石墨样品的温度。实验表明，较高的温度和较长的波长更适合在石英灯辐射加热系统中进行热测量。该分析为热辐射环境中漫反射表面的温度测量提供了一种有价值的方法。
