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Research on Extrapolation of PPRTs Deviation Equation to -189.3442~156.5985℃ |
WANG Bo-yang1,ZENG Fan-chao2,HUANG An-yi1,SUN Jian-ping3,FU Cheng-yu2 |
1. Wuhan University of Technology, Wuhan, Hubei 430070, China
2. Hubei Instiute of Measurement and Testing, Wuhan, Hubei 430223, China
3. National Institute of Metrology, Beijing 100029, China |
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Abstract The traceability of precision platinum resistance thermometers (PPRTs) can be improved by using the fixed-points method defined by the International Temperature Scale of 1990 (ITS-90). Due to the small number of fixed-points and the large temperature interval in ITS-90, the extrapolation based on deviation equation is an effective method to solve the problem of thermometer calibration beyond the temperature range. In the experiment, 16 PPRTs were calibrated in the temperature range of -189.3442~156.5985℃ to verify the extrapolation feasibility of the fixed-points method deviation equation and comparison method deviation equation.The experimental results showed that the average maximum difference using the new deviation equation from -38.8344~0.01℃ was 5.2mK when extrapolating to -189.3442℃; the average maximum difference using the deviation equation from 0~29.7646℃ was 2.0mK when extrapolating to 156.5985℃; and the average difference using comparison method deviation equation was less than 3.3mK.All the three equations improved the extrapolation accuracy of PPRTs out of the fixed-points temperature range and provided supporting data for the traceability of spaceborne blackbody radiation source.
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Received: 07 April 2021
Published: 18 July 2022
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Fund:Technology of Space radiation reference load in Infrared Emission Spectrum |
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