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Development and Evaluation of Alternatives to the Triple Point of Mercury in the ITS-90 for a Mercury-Free Practical Temperature Scale

Research Project

Project/Area Number 21K14543
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29030:Applied condensed matter physics-related
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Kawamura Yasuki  国立研究開発法人産業技術総合研究所, 計量標準総合センター, 主任研究員 (80803858)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords温度標準 / ITS-90 / 三重点 / 精密温度計測 / 水銀 / キセノン / 熱力学温度 / 水銀の代替 / 温度定点 / 熱力学温度測定
Outline of Research at the Start

本研究では、熱力学温度の最良近似となる実用温度目盛を水銀フリーで実現することを目的として、水銀フリー実用温度目盛の新規温度定点候補であるキセノンの三重点の高精度実現を行うとともに、その三重点の熱力学温度を音響気体温度計によって明らかにする。また、申請者がこれまでに開発してきた新規温度定点候補である二酸化炭素、六フッ化硫黄の三重点の熱力学温度も明らかにすることで、水銀フリーな次世代の温度標準の構築へと繋げる。

Outline of Final Research Achievements

The purpose of this study is to develop and to evaluate the alternatives for the triple point of mercury used in the ITS-90 for proposing a mercury-free practical temperature scale as the best approximate of the thermodynamic temperature. As alternatives to the triple point of mercury, which is essential for realizing the ITS-90 in low-temperature, we focused on the triple point of carbon dioxide, sulfur hexafluoride, and xenon. In this study, these alternatives have successfully been realized with uncertainties equivalent to those of the triple point of mercury. A mercury-free temperature scale has also been constructed using these alternative fixed points and compared with the ITS-90, demonstrating equivalence in uncertainty. Furthermore, to provide the thermodynamic temperature of the alternative fixed points, a low-temperature AGT has been developed using which highly accurate thermodynamic temperature at the triple point of mercury has been measured.

Academic Significance and Societal Importance of the Research Achievements

水銀の生産、輸送、使用に関する国際的な規制が年々強まる中、水銀の使用が必要不可欠である国際温度目盛の水銀フリー化は大きな課題であり、国際単位等に関して課題を具体的に検討する国際度量衡委員会の測温諮問委員会においても問題視されている。本研究の成果は、水銀の代替として二酸化炭素、六フッ化硫黄、キセノンを利用することで既存の国際温度目盛と同等の温度目盛を実現可能であることを示しており、将来的な水銀利用の低減に貢献することが期待できる。本成果は測温諮問委員会においても情報が共有されており、国際的な温度標準の持続、すなわち温度計測の信頼性を確保し続けるための重要な結果となり得る。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results) Presentation (4 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Investigation to replace the triple point of Hg in the ITS-902024

    • Author(s)
      Yasuki Kawamura, Nobuhiro Matsumoto and Tohru Nakano
    • Journal Title

      AIP Conference Proceedings (Temperature: Its Measurement and Control in Science and Industry)

      Volume: 9

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Non-uniqueness and propagating uncertainties of the temperature scale realized using the triple point of sulfur hexafluoride2022

    • Author(s)
      Kawamura Yasuki、Nakano Tohru
    • Journal Title

      Measurement: Sensors

      Volume: 24 Pages: 100464-100464

    • DOI

      10.1016/j.measen.2022.100464

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Evaluation of the temperature scale of SPRT calibrated at the triple point of sulfur hexafluoride2021

    • Author(s)
      Kawamura Yasuki、Nakano Tohru
    • Journal Title

      Measurement: Sensors

      Volume: 18 Pages: 100211-100211

    • DOI

      10.1016/j.measen.2021.100211

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Evaluation of the triple point of xenon and temperature scales of SPRTs calibrated at the tripe point of xenon, carbon dioxide and sulfur hexafluoride2023

    • Author(s)
      Yasuki Kawamura, Nobuhiro Matsumoto and Tohru Nakano
    • Organizer
      10th International Temperature Symposium
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Impurity effect on the triple point temperature of xenon2023

    • Author(s)
      Yasuki Kawamura and Tohru Nakano
    • Organizer
      EUROPEAN CONFERENCE ON THERMOPHYSICAL PROPERTIES 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水銀フリー温度目盛におけるノンユニークネスの評価2022

    • Author(s)
      河村泰樹、中野享
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Evaluation of the temperature scale of SPRT calibrated at the triple point of sulfur hexafluoride2021

    • Author(s)
      Yasuki Kawamura and Tohru Nakano
    • Organizer
      IMEKO XXIII World Congress (IMEKO2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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