计量学报2026，Vol.47Issue(2)：159-165,7.DOI:10.3969/j.issn.1000-1158.2026.02.01
基于镓熔点新内插方法可行性探索
Feasibility Study of a Novel Interpolation Method Based on Gallium Melting Point
摘要
Abstract
To investigate the feasibility of substituting the triple point of water with the gallium melting point as the resistance ratio reference point for the International Temperature Scale of 1990(ITS-90),the interpolation equations and reference functions defined by ITS-90 were preserved unchanged.Calibration data were obtained from 37 standard platinum resistance thermometers for the temperature range of 273.16 K to 933.473 K and from 27 thermometers for the range of 83.808 3 K to 273.16 K.A novel interpolation equation was developed using the gallium melting point as the reference point and subsequently compared with the original ITS-90 equation based on the triple point of water.Results revealed that in 273.16～933.473 K,the deviation from the original equation after substitution was merely 11 μK,while in 83.808 3～273.16 K,the deviation did not exceed 0.5 mK.Uncertainty propagation analysis indicated that deviations of both equations were within 0.4 mK.The approach provides a novel perspective and enhanced feasibility for the application of the ITS-90.关键词
温度计量/90国际温标/镓熔点/水三相点/内插方程/不确定度传播Key words
thermometer/ITS-90/gallium melting point/triple point of water/interpolation equation/uncertainty propagation分类
通用工业技术引用本文复制引用
陈松奎,李婷,孙建平,王光耀,胡靖,毋愚,李嘉豪,陶雨佳..基于镓熔点新内插方法可行性探索[J].计量学报,2026,47(2):159-165,7.基金项目
国家自然科学青年科学基金(52306121) （52306121）
中国计量科学研究院基本科研业务费重点领域项目(AKYZD2301-1) （AKYZD2301-1）
