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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.
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| Keywords:
04.80.Cc
68.37.Hk
87.57.Nk
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Received: 17 September 2008
Published: 24 December 2008
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| PACS: |
04.80.Cc
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(Experimental tests of gravitational theories)
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68.37.Hk
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(Scanning electron microscopy (SEM) (including EBIC))
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87.57.Nk
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