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

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 approache...

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Published inChinese physics B Vol. 24; no. 1; pp. 95 - 108
Main Author 李世松 张钟华 赵伟 李正坤 黄松岭
Format Journal Article
LanguageEnglish
Published 2015
Subjects
Balancing
Constants
Counting
Metrology
Physical properties
Plancks constant
Quantum theory
原子
基本物理常数
平衡
普朗克常数
瓦特
精确测量
计数
量子物理学
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Summary: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.
Bibliography:Planck constant; watt balance; silicon sphere; Avogadro constant
Li Shi-Song,Zhang Zhong-Hua,Zhao Wei,Li Zheng-Kun,Huang Song-Ling（ 1. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China ;2. National Institute of Metrology, Beijing 100029, China）
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.
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/1/010601