Research on the Influence of Cavity Effect on Integrated Blackbody High-temperature Emissivity Measurement
SUN Luge1,AN Baolin2,ZHAO Yunlong2,WANG Bingkai3,ZHAI Huixing1, DONG Wei2,WANG Ruixiang1
1. Beijing Engineering Research Center of Sustainable Energy and Buildings,Beijing University of Civil Engineering and Architecture,Beijing 100044, China
2. National Institute of Metrology, Beijing 100029, China
3. Changchun University of Science and Technology, Changchun, Jilin 130022, China
Abstract：Theoretical models for correction factors of non-isothermal boundary cavity effects in integrated blackbody method are proposed. Based on the finite element method, theoretical calculations of correction factors for non-isothermal boundary cavity effects are carried out under different emissivity samples and specific temperature fields. These calculations are compared with correction factors obtained based on the Monte Carlo ray tracing method, showing good agreement with a maximum deviation of no more than 2.5%. The results indicate that with longer wavelengths and lower sample emissivity, the cavity effect has a greater impact on emissivity measurement results. Emissivity measurements of platinum material samples are conducted at 1000°C temperature and within the wavelength range of 12~14μm. These measurements are compared with results obtained using the discrete blackbody method. After correction, the consistency between the integrated blackbody method and the discrete blackbody method is improved from 0.08 to 0.03. This result verifies the feasibility of introducing correction factors for non-isothermal boundary cavity effects in the theoretical model and improves the accuracy of emissivity measurement using this method.
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2024, Vol. 45 
