Measurement of Density Inhomogeneity for Glass Pendulum

作     者：刘琳霞 刘祺 邵成刚 张雅婷 罗俊 Vadim Milyukov 

作者机构：Department of Physics Huazhong University of Science and Technology Wuhan 430074 Sternberg Astronomical Institute Moscow State University Moscow 119992 Russia 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2008年第25卷第12期

页      面：4203-4206页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Supported by the National Basic Research Programme of China under Grant No 2003CB716300  the National Natural Science Foundation of China under Grant No 10121503  and Russian Foundation for Basic Research (No 05-02-39014) 

主　　题：field emission molybdenum dioxide enhancement factor 

摘      要：The density inhomogeneity of a glass pendulum is determined by an optical interference method. The relative variations of the densities over a volume with sizes of 5 × 5×5 mm^3 are （0.64 ± 0.97） × 10^-5 and （0.99 ± 0.92） × 10^-5 for the K9 glass and silica glass pendulum, respectively. These variations of densities contributing to the relative uncertainties of the Newtonian gravitational constant G are 0.20 ppm and 0.21 ppm in our experiment on measurement of G.