作者：廖艳1, 赵晶1, 孙建平2, 冯锦1, 余明礼1, 汤晓1, 王晟程1
作者单位：1. 中国测试技术研究院，四川 成都 610021;
2. 中国计量科学研究院，北京 100013
关键词：铟凝固点;比对;ITS-90;固定点;副基准;基准;温坪
摘要：
铟凝固点是90国际温标（ITS-90）重要的定义固定点之一，为验证中国测试技术研究院建立保存的国家温度副基准装置复现铟凝固点热力学温度的技术水平，于2018年与中国计量科学研究院的国家温度基准装置开展铟凝固点的比对。此次比对采用标准铂电阻温度计作为传递标准。传递标准分别在副基准装置和基准装置的铟凝固点中至少3个不同温坪上进行测量，并根据ITS-90规定对测量数据进行修正，计算电阻比$W$，将多次测量的平均值$\overline W$作为实验结果。通过归一化偏差En值对测量结果的一致性进行评判，比对结果表明铟凝固点副基准与基准在0.1 mK内相一致。
Comments on interlaboratory comparison between national secondary standard and primary standard for temperature on indium freezing point
LIAO Yan1, ZHAO Jing1, SUN Jianping2, FENG Jin1, YU Mingli1, TANG Xiao1, WANG Shengcheng1
1. National Institute of Measurement and Testing Technology, Chengdu 610021, China;
2. National Institute of Metrology,China, Beijing 100013, China
Abstract: Indium freezing point is one of the important fixed points in ITS-90 international temperature scale. In 2018, the interlaboratory comparison was carried out between National Institute of Metrology (NIM) and National Institute of Measurement and Testing Technology (NIMTT) on the indium freezing point (In FP) to verify the technical level of secondary standard. The SPRTs are as the artifacts by reference to the international comparison. Traveling SPRT was calibrated at least 3 plateau at the freezing point of indium of the primary standard and the secondary standard. According to the ITS-90, calibration data was corrected and the value of W was calculated. Calibration results supplied in $\overline W$, where $\overline W$ is the mean resistance ratio from calibrations at In. The consistency of measurement results is evaluated by normalized deviation En. The comparison results show that indium freezing point secondary standard is consistent with the primary standard within 0.1 mK.
Keywords: indium freezing point;interlaboratory comparison;ITS-90;fixed point;secondary standard;primary standard;plateau
2020, 46(8):22-27 收稿日期: 2019-07-15;收到修改稿日期: 2019-08-08
基金项目:
作者简介: 廖艳（1982-），女，四川内江市人，工程师，硕士，主要从事温度计量与测试研究
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