Development of Large-aperture and High-emissivity Surface Blackbody Radiation Source
HU You-hua1,2,HAO Xiao-peng2,SIMA Rui-heng2,XIE Chen-yu2,SONG Jian2,LIU Yang2,WU Qiang2,YANG Yan-long1,2
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：As a primary standard, the black body radiation source plays an important role in the calibration of infrared measurement equipment. In order to response the needs for the radiometric calibration of large aperture infrared measurement equipment, a surface blackbody source whose area is 400mm×400mm has been designed. The temperature control of the blackbody is carried out through the multi-channel temperature control method and the method of connecting a fixed cold source. The appropriate heat transfer model has been determined by thermal simulation. Combining high emissivity coating process and structural design of the radiating surface makes the black body have high emissivity, the effective emissivity of the blackbodys radiating surface is 0.992. The temperature maximum uniformity deviation of blackbody radiation source measured by standard platinum resistance thermometers is 0.101K and the average stability is about 0.018K/10mins, it can satisfy the requirement of blackbody radiation sources for large aperture infrared measurement equipment.
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2021, Vol. 42 
