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

作     者：李世松 张钟华 赵伟 李正坤 黄松岭 

作者机构：Department of Electrical Engineering Tsinghua University National Institute of Metrology 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2015年第24卷第1期

页      面：95-108页

核心收录：

学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 07[理学] 08[工学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：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) the National Key Technology R&D Program of China(Grant No.2006BAF06B01) 

主　　题：Planck constant watt balance silicon sphere Avogadro constant 

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.