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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
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。
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.
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
thermometer / ITS-90 / gallium melting point / triple point of water / interpolation equation / uncertainty propagation
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