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
3. School of Science, Xi′an Polytechnic University, Xi′an, Shaanxi 710048, China
Abstract：The structure and operating principle of the 190～340K vacuum standard blackbody source for vacuum radiance temperature national standard facility (VRTSF) is detaily described. The major technical parameters are tested, including the axial temperature uniformity of the blackbody cavity, temperature stability and so on. The emissivity of the blackbody cavity is calculated, influence of which is analyzed from the uniformity of temperature field. The experiments results show that the axial temperature uniformity of the blackbody cavity is 0.028K and the temperature stability is 0.008K at the temperature of 300K. The emissivity of the blackbody cavity is better than 0.999 9. The uncertainty for the standard blackbody is analyzed, and the combined standard uncertainty is less than 0.030K when the wavelength is between 4 to 14 μm.
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2015, Vol. 36 
