Comparison of Scale Division Methods between Single-fixed-point Extrapolation and Multi-fixed-point Interpolation for 0.9μm Pyrometers
LIU Xiao-ying1,2,LIU Ju-fen2,WANG Jing-hui1,LU Xiao-feng1
1. Heat Division, National Institute of Metrology, Beijing 100029, China
2. School of Information and Communication Engineering, North University of China, Taiyuan, Shanxi 030051, China
Abstract：Scale division methods for single fixed-point extrapolation and multiple fixed-point interpolation are two commonly used calibration methods for standard photoelectric pyrometers. A comparative study of two methods was carried out for a newly developed 0.9μm photoelectric pyrometer. In the temperature measurement range of 500~1800℃, the high-temperature blackbody furnace was used as a comparison source to verify the value at the hundreds of temperature points against a standard photoelectric pyrometer. The results show that the consistency of the temperature values of the two methods is better than 0.2℃, and the maximum error away the standard value is not more than 0.6℃. The calibration uncertainty of the two methods is evaluated as 0.2~1.3℃ and 0.2~0.8℃, respectively, k=2. The single fixed point extrapolation method must measure the pyrometer spectral responsivity and non-linearity. The multiple fixed-point interpolation method is simple and easy to operate, and the uncertainty can be kept at a high level. The multi-fixed-point interpolation method can be universally used for most temperature calibration laboratories, whether it is for the manufacture or the periodic calibration.
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2021, Vol. 42 
