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 

机构地区：[1]Department of Electrical Engineering, Tsinghua University [2]National Institute of Metrology

出　　处：《Chinese Physics B》2015年第1期95-108,共14页中国物理B（英文版）

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)

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.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 

分 类 号：O413[理学—理论物理] TM935.2[理学—物理]