标准铂铑10-铂热电偶热电势约束公式探讨

doi:10.3969/j.issn.1000-1158.2020.02.08

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摘要铂铑10-铂热电偶可以通过3个固定点的热电势与温度之间的关系反映其特性。在ITPS-68温标中,铂铑10-铂热电偶作为温标内插仪器,其3个固定点热电势必须满足一定的约束公式。介绍了从其约束公式推导出现行检定规程使用的3个不同的温度固定点的新约束公式,以规范标准铂铑10-铂热电偶的热电特性;通过对大量源于中国计量科学研究院热电偶校准实验室的标准热电偶的实际数据的计算,验证了新约束公式的有效性。新公式在锌固定点的不合格检出率从0% 提升到3%左右。

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	郑玮
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关键词 ：计量学;铂铑10-铂热电偶;热电特性, 约束公式, ITPS-68温标

Abstract：The characteristics of Pt-10% Rh/Pt thermocouple on temperature versus EMFs were described with the calibration results on three fixed point temperatures. In ITPS-68 temperature scale, Pt-10% Rh/Pt thermocouple was selected as interpolation equipment, and its three fixed point EMFs should be restrained to meet the certain formulas. The new constraint formulas on three different fixed point temperatures were derivable from traditional requirement in IPTS-68 to regulate the standard Pt-10% Rh/Pt thermocouple characteristics, and were verified to be efficient by the original data of the great amount of thermocouples from the calibration service laboratory of National Institute of Metrology. The rejection ratio of standard thermocouple at Zn fixed point was slightly raised from 0% to about 3% when the new constraint formulas were applied.

Key words： metrology;Pt-10% Rh/Pt thermocouple thermoelectric characteristics constraint formula ITPS-68 temperature scale

收稿日期: 2018-08-30 发布日期: 2020-02-17

PACS:

TB942

基金资助:国家质量基础的共性研究与应用项目(2017YFF0205903)

通讯作者: 汤磊(1983-),北京人,中国计量科学研究院工程师,主要从事热电偶计量检定和量值传递研究工作。 Email: tangl@nim.ac.cn E-mail: zhengw@nim.ac.cn

作者简介: 郑玮(1965-), 北京人, 中国计量科学研究院副研究员, 主要从事热电偶计量装置和方法及新型热电偶温度计性能研究。 Email: zhengw@nim.ac.cn

引用本文:

郑玮,汤磊. 标准铂铑10-铂热电偶热电势约束公式探讨[J]. 计量学报, 2020, 41(2): 175-178.
ZHENG Wei,TANG Lei. The Research on the Constraint Formulas of EMFs as a Standard Pt-10% Rh/Pt Thermocouple. Acta Metrologica Sinica, 2020, 41(2): 175-178.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2020.02.08 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2020/V41/I2/175