中国物理B ›› 2015, Vol. 24 ›› Issue (1): 10601-010601.doi: 10.1088/1674-1056/24/1/010601

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Progress on accurate measurement of the Planck constant: Watt balance and counting atoms

李世松a b, 张钟华b, 赵伟a, 李正坤b, 黄松岭a   

  1. a Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;
    b National Institute of Metrology, Beijing 100029, China
  • 收稿日期:2014-08-03 修回日期:2014-09-05 出版日期:2015-01-05 发布日期:2015-01-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 51477160), the National Department Public Benefit Research Foundation of China (Grant No. 201010010), and the National Key Technology R&D Program of China (Grant No. 2006BAF06B01).

Progress on accurate measurement of the Planck constant: Watt balance and counting atoms

Li Shi-Song (李世松)a b, Zhang Zhong-Hua (张钟华)b, Zhao Wei (赵伟)a, Li Zheng-Kun (李正坤)b, Huang Song-Ling (黄松岭)a   

  1. a Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;
    b National Institute of Metrology, Beijing 100029, China
  • Received:2014-08-03 Revised:2014-09-05 Online:2015-01-05 Published:2015-01-05
  • Contact: Li Shi-Song, Zhang Zhong-Hua E-mail:leeshisong@sina.com;zzh@nim.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 51477160), the National Department Public Benefit Research Foundation of China (Grant No. 201010010), and the National Key Technology R&D Program of China (Grant No. 2006BAF06B01).

摘要:

The Planck constant h is one of the most significant constants in quantum physics. Recently, the precision measurement of the value of h has been a hot issue due to its important role for the establishment of both a new SI and a revised fundamental physical constant system. Up to date, two approaches, the watt balance and counting atoms, have been employed to determine the Planck constant at a level of several parts in 108. In this paper, the principle and progress on precision measurement of the Planck constant using watt balance and counting atoms at national metrology institutes are reviewed. Further improvement in determining the Planck constant and possible developments of a revised physical constant system in future are discussed.

关键词: Planck constant, watt balance, silicon sphere, Avogadro constant

Abstract:

The Planck constant h is one of the most significant constants in quantum physics. Recently, the precision measurement of the value of h has been a hot issue due to its important role for the establishment of both a new SI and a revised fundamental physical constant system. Up to date, two approaches, the watt balance and counting atoms, have been employed to determine the Planck constant at a level of several parts in 108. In this paper, the principle and progress on precision measurement of the Planck constant using watt balance and counting atoms at national metrology institutes are reviewed. Further improvement in determining the Planck constant and possible developments of a revised physical constant system in future are discussed.

Key words: Planck constant, watt balance, silicon sphere, Avogadro constant

中图分类号:  (Metrology)

  • 06.20.-f
06.20.Jr (Determination of fundamental constants) 07.05.Fb (Design of experiments) 07.10.Pz (Instruments for strain, force, and torque)