Development of Vacuum Standard Blackbody Radiation Source in Middle Temperature Zone
YANG Yan-long1,2,HAO Xiao-peng2,SONG Jian2,LIU Yang2,HU You-hua1,2,XIE Chen-yu2,LIU Yan2,XIE Lin-lin2
1. College of Applied Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2. National Institute of Metrology, Beijing 100029, China
Abstract：The structure design, working principle, test results and uncertainty evaluation of the medium temperature vacuum standard blackbody radiation source developed by National Institution of Metrology in China are introduced. The black body radiation source has a working temperature range of 320～500K, the black body cavity aperture diameter is 50mm, the cavity depth is 260mm, the surface is sprayed with high temperature paint, and the cavity emissivity is better than 0.999. The blackbodys axial temperature uniformity, temperature stability and blackbody radiation source brightness temperature were tested in vacuum, and the blackbody temperature uniformity is better than 0.15K, and the temperature stability within 40min is better than 0.03K. The uncertainty sources of black body radiation source are analyzed, and the combined standard uncertainty of the black body radiation source is better than 0.04K.
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2021, Vol. 42 
