Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Measurement of triple point of water temperature for improvement of the national standards and key comparison

국가표준향상과 핵심국제비교를 위한 물의 삼중점 온도 측정

  • Yang, Inseok (Division of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Lee, Young Hee (Division of Physical Metrology, Korea Research Institute of Standards and Science)
  • 양인석 (한국표준과학연구원 물리표준본부) ;
  • 이영희 (한국표준과학연구원 물리표준본부)
  • Received : 2021.08.31
  • Accepted : 2021.09.29
  • Published : 2021.09.30
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Abstract

The Korea Research Institute of Standards and Science (KRISS), a National Metrology Institute of Korea, participated in the second-round of the international key comparison CCT-K7.2021 of triple point of water (TPW) cells. For the key comparison, three TPW cells, one of which had been used in the old CCT-K7 comparison, were assigned as the national standard of the TPW. The temperature difference (ΔT) between the average of the new and old national standards and ΔT between the new national standard and the transfer standard were measured. The comparison between the new and old national standards indicated a temperature increase of 69.5 µK after both the standards were corrected for the isotopic composition. The uncertainty of the national standard of the TPW temperature was 28 µK, and the uncertainty of ΔT was 14 µK. Three aspects of improvements in the new comparison compared to the old one were noted: (1) inclusion of two quartz cells in the national standard strengthens its long-term stability; (2) the standard deviation associated with the measurement of ΔT was reduced from 21 µK to 9.6 µK; (3) and the measured immersion profile of the TPW cells was much closer to the theoretically predicted dependence.

Keywords

Acknowledgement

이 논문은 2021년도 한국표준과학연구원의 물리 측정표준기술 고도화 재원으로 지원을 받아 수행된 연구이다 (한국표준과학연구원 - 2021 - GP2021-0002).

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