基于镓熔点新内插方法可行性探索

陈松奎, 李婷, 孙建平, 王光耀, 胡靖, 毋愚, 李嘉豪, 陶雨佳

计量学报 ›› 2026, Vol. 47 ›› Issue (2) : 159-165.

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计量学报 ›› 2026, Vol. 47 ›› Issue (2) : 159-165. DOI: 10.3969/j.issn.1000-1158.2026.02.01
热学计量

基于镓熔点新内插方法可行性探索

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Feasibility Study of a Novel Interpolation Method Based on Gallium Melting Point

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摘要

在不改变90国际温标(ITS-90)的内插方程和参考函数的前提下,探索将镓熔点代替水三相点作为ITS-90电阻比参考点的可行性。针对广泛使用的273.16 ~ 933.473 K和83.808 3 ~ 273.16 K两大温区,分别选取37支和27支标准铂电阻温度计的校准数据,采用镓熔点作为电阻比参考点建立新内插方程,并与基于水三相点原ITS-90内插方程进行比较。结果表明:在273.16 ~ 933.473 K温区内将电阻比参考点由水三相点替换为镓熔点后,与原内插方程结果的偏差仅为11 μK,在83.808 3 ~ 273.16 K范围内,偏差不超过0.5 mK;通过不确定度传播分析,新旧两个方程偏差分别在0.4 mK范围内。这一方法可为ITS-90的应用提供了新的视角和实用性。

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

引用本文

导出引用
陈松奎, 李婷, 孙建平, . 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 https://doi.org/10.3969/j.issn.1000-1158.2026.02.01
CHEN Songkui, LI Ting, SUN Jianping, et al. Feasibility Study of a Novel Interpolation Method Based on Gallium Melting Point[J]. Acta Metrologica Sinica. 2026, 47(2): 159-165 https://doi.org/10.3969/j.issn.1000-1158.2026.02.01
中图分类号: TB942   

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基金

国家自然科学青年科学基金(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)

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