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| Study on the Feasibility of Interpolation Method of SF6 and CO2 Triple Point Replacement of Mercury Triple Point |
| YANG Jin-nan1,PAN Jiang1,SUN Jian-ping2,LI Ting2,WANG Hong-jun2,YU Jiao3,RUAN Yi-ming1,Wang Guang-yao2 |
1. China Jiliang University, Zhejiang, Hangzhou 310018, China;
2. National Institute of Metrology,Beijing 100029, China
3. Xi‘an Polytechnic University, Shaanxi, Xi'an 710048, China |
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Abstract For the temperature range from 83.8058K to 273.16K, the replacement of the mercury triple point by SF6 or CO;2 triple point were theoretically analyzed. Without changing the form of interpolation equation of ITS-90, the changes of the temperature deviation and the propagation uncertainty before and after replacement were discussed. The results show that the equations defined by ITS-90 still have the applicability in the temperature range even when SF6 triple point and CO2 triple point replace Hg triple point. Under the same level of the realization uncertainties of the three fixed points, the propagation uncertainty of Hg, SF6 and CO2 triple points decreases in turn over the whole temperature range. It is predicted that the corresponding temperature primary standard level of NIM has no change when the realization uncertainty of SF6 and CO2 triple points is less than 0.25mK (k=1) and 0.27mK (k=1), respectively.
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Received: 16 November 2021
Published: 23 February 2022
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2022, Vol. 43 
