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자료유형
학술저널
저자정보
양인석 (한국표준과학연구원) 이영희 (한국표준과학연구원 물리표준본부)
저널정보
한국센서학회 센서학회지 센서학회지 제30권 제5호
발행연도
2021.9
수록면
349 - 356 (8page)

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초록· 키워드

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The Korea Research Institute of Standards and Science (KRISS), a National Metrology Institute of Korea, participated in the secondround 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.

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