Research of 100~400 K Vacuum Infrared Radiance Temperature Standard Blackbody Source
SHU Xin1,2,HAO Xiao-peng2,SONG Jian2,YUAN Zun-dong2,XUE Sheng-Hu1,HU Chao-yun2,3
1. College of Metrology & Measurement Engineering, China Jiliang University, Zhejiang, Hangzhou 310018, China
2. National Institute of Metrology, Beijing 100029, China
3. College of Applied Nuclear Technology andAutomation Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract：The working principles, structure, performance-testing methods and the testing results of the vacuum infrared radiance temperature standard blackbody source is described. By applying liquid nitrogen cooling and 3-temperature-zones controlling, the temperature of this blackbody radiation source can be controlled at the range from 100K to 400K. The axial temperature uniformity, temperature stability of the cavity bottom of the blackbody within 100 ~ 400K are tested in a vacuum environment. Testing results are shown that the uniformity is better than 0.120K, and the stability of the temperature is controlled below 0.020K/20 min, respectively. In the atmospheric environment at room temperature, the emissivity of the blackbody is 0.9998 measured by the method based on controlling surroundings radiation. Based on the Monte Carlo blackbody emissivity simulation method, the influence of the temperature uniformity of the cavity emissivity is analyzed. The source of uncertainty of this blackbody radiation source is analyzed, and the combined standard uncertainty is less than 0.030K when the wavelength is between 8 μm to 16 μm.
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2019, Vol. 40 
