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| Measurement of the True Temperature at the Bottom of a Blackbody Cavity Based on Active Laser Radiation Thermometry |
| WANG Xinyu1,AN Baolin2,ZHANG Xinda2,DONG Wei2,YAN Quanying1,ZHAO Yunlong2,ZHAI Huixing1 |
1.School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
2. National Institute of Metrology, Beijing, 100029, China |
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Abstract The true temperature and uniformity of the blackbody cavity bottom are the key factors affecting the evaluation of the cavity emissivity, but the existing studies for the temperature uniformity characterization are mostly based on the brightness temperature. An active laser radiation thermometry technique, which is capable of emissivity-free temperature measurement, is applied to carry out a study on the real surface temperature and uniformity measurement of the cavity bottom of a blackbody radiation source in 973K. Meanwhile, based on the measured temperature field data, the Monte-Carlo method was used to numerically simulate the effective emissivity distribution of the cavity, obtaining the simulation results at typical positions and combining with the bright temperature data to obtain the true temperature field at the bottom of the cavity. And compared with the direct measurement results of the surface real temperature by active laser radiation thermometry, the results show that for the nine selected measurement points, the relative deviations of the two are between 0.04% and 0.77%. The good agreement verifies the feasibility of the active laser radiometric thermometry technique for true temperature measurements at the bottom of the cavity of a blackbody radiation source.
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Received: 21 November 2023
Published: 03 April 2024
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2024, Vol. 45 
