Chin. Phys. Lett.  2009, Vol. 26 Issue (1): 010403    DOI: 10.1088/0256-307X/26/1/010403
GENERAL |
Measurement of Density Inhomogeneity for Source Masses in Time-of-Swing Method of Measuring
LIU Lin-Xia, SHAO Cheng-Gang, TU Liang-Cheng, LUO Jun
Department of Physics, Huazhong University of Science and Technology, Wuhan 430074
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LIU Lin-Xia, SHAO Cheng-Gang, TU Liang-Cheng et al  2009 Chin. Phys. Lett. 26 010403
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Abstract

A method with scanning electron microscopy (SEM) is presented to measure the density inhomogeneity of the stainless steel (SS316) sphere prepared for measuring G using time-of-swing method. The experimental result shows that the relative density inhomogeneity of the sphere is better than 5.9×10-4 over the volume of 0.272×0.234×0.005mm3. If we assume that the density inhomogeneity of the spheres used in our G measurement is the same as that of the sphere destroyed in testing, it will contribute to G value with an uncertainty of less than 0.034ppm in our G measurement. Furthermore, the mass centre offset from the geometric centre of the sphere will be less than 4.3×10-4,μm due to this inhomogeneity.

Keywords: 04.80.Cc      68.37.Hk      87.57.Nk     
Received: 17 September 2008      Published: 24 December 2008
PACS:  04.80.Cc (Experimental tests of gravitational theories)  
  68.37.Hk (Scanning electron microscopy (SEM) (including EBIC))  
  87.57.Nk  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/1/010403       OR      https://cpl.iphy.ac.cn/Y2009/V26/I1/010403
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LIU Lin-Xia
SHAO Cheng-Gang
TU Liang-Cheng
LUO Jun
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