Development of Vacuum Gallium Fixed-point Blackbody
SONG Jian1,HAO Xiao-peng1,HU Chao-yun1,ZHOU Jing-jing1,2,YANG Yan-long1,3,LIU Yang1,XIE Chen-yu1
1. National Institute of Metrology, Beijing 100029, China
2. School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
3. College of Nuclear Technology and Automation Engineering,Chengdu University of Technology, Chengdu, Sichuan 610059 , China
Abstract：The vacuum gallium fixed-point blackbody radiation source is developed to meet the requirements of radiometric calibration on the infrared remote sensing payload and achieve effective traceability of radiation values to ITS-90. The diameter of the blackbody cavity opening is 25mm, the depth of the cavity is 220mm. The cavity is coated with high emissivity coating. The emissivity of the blackbody is calculated to be 0.9999. The repeatability of the gallium fixed-point phase change plateau is measured under vacuum, the result is 4.4 mK. The stability of the plateau is better than 2 mK. The radiance temperature of the blackbody is measured, and the average radiance temperature in the wavelength range of 8~16 μm is 302.905 K. the influence of the circulating fluid temperature on the plateau and the radiance temperature of blackbody is studied. The combined standard uncertainty of the gallium fixed-point blackbody is analyzed, the result is 0.014K.
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2022, Vol. 43 
