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| Theoretical Model and Verification of Annealing Characteristic of the New Standard Platinum Resistance Thermometer |
| YU Fan1, SUN Jian-ping2, LI Ting2, ZHU Tian-meng3, WANG Cheng-ke3 |
1. School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. National Institute of Metrology, Beijing 100029, China
3.China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract According to the theory of recrystallization kinetics, two theoretical models were established for the change law of the triple point resistance of water with time during the first annealing of a new standard platinum resistance thermometer (SPRT), it was concluded that that the dimensionless resistance value change have the dimensionless resistance value change has the characteristics of an exponential function and the linear characteristic of the double logarithmic dimensionless resistance value change function. Based on the experimental data of 15 SPRTs annealed at 660 ℃, the range and average value of annealing parameters and annealing index were obtained. The calculated results of theoretical model showed that the stability of SPRTs could reach about 1mK after 1 000 hours. The annealing average stability curve of SPRT could reflect the change law of the annealing stability of the thermometer to a certain extent, and could provide a theoretical prediction and reference for the reasonable annealing process.
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Received: 17 February 2020
Published: 23 June 2021
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2021, Vol. 42 
