1. College of Metrology and Measurement Engineering, China Jiliang University, Zhejiang,Hangzhou 310018, China
2. National Institute of Metrology, Beijing 100029, China
Abstract：The high-precision realization and accurate measurement of triple point of water (TPW) are the keys to ensure the implementation of the International Temperature Scale of 1990 (ITS-90). The isotopic compositions of the high purity water in the TPW cells affect the temperature of TPW. In order to improve the TPW realization and reduce the influence of hydrogen and oxygen isotopes, quartz and borosilicate glass high-accuracy TPW cells with hydrogen and oxygen isotopic analyses were developed. In order to evaluate the performance of the cells, comparisons between the borosilicate glass cells and the quartz cells were carried out. The experimental results show that, before the isotopic corrections, the temperature differences between the quartz and borosilicate glass high-accuracy TPW cells are within 0.058mK. After application of the corrections, the temperature differences are within 0.017mK. The expanded uncertainty of the realization of TPW using high-accuracy TPW cells is 0.066mK (k=2).
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2023, Vol. 44 
