Acta Metrologica Sinica  2022, Vol. 43 Issue (10): 1279-1284    DOI: 10.3969/j.issn.1000-1158.2022.10.06
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The Investigation on the Temperature Field Uniformity of a High-precision Vacuum Blackbody
WU Qiang1,HAO Xiao-peng1,SONG Jian1,LI Guo-zhan2
1. National Institute of Metrology, Beijing 100029, China
2. China Jiliang University, Hangzhou, Zhejiang 310018, China
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Abstract  In order to further improve the temperature control accuracy of vacuum black body, the temperature distribution of vacuum black body is studied by means of theoretical analysis, numerical simulation and experiment, the heat transfer formula between black body and environment is derived, and the temperature distribution characteristics of vacuum black body are analyzed.For the specific black body structure, the corresponding temperature field control equation is further simplified, the three-dimensional model is simplified to a one-dimensional model without loss of precision, the calculation complexity is reduced, the simulation time is shortened, and the numerical stability in the process of solving is improved.The numerical results are in good agreement with the experimental data, but the global maximum temperature difference of vacuum black matter obtained by numerical simulation is about 3 times the temperature difference between measuring points, which indicates that the actual temperature control accuracy of black body is much lower than that of experiment results.
Key wordsmetrology      vacuum blackbody      temperature field uniformity      radiant heat transfer     
Received: 03 November 2021      Published: 14 October 2022
PACS:  TB942  
Fund:National Key R&D Program of China;National Natural Science Foundation of China
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WU Qiang
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WU Qiang,HAO Xiao-peng,SONG Jian, et al. The Investigation on the Temperature Field Uniformity of a High-precision Vacuum Blackbody[J]. Acta Metrologica Sinica, 2022, 43(10): 1279-1284.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.10.06     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I10/1279
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