a New Determination of G with Time-Of Method

Details a New Determination of G with Time-Of Method a New Determination of G with Time-Of Method

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010gras.conf...16y&link_type=abstract

GRAVITATION AND ASTROPHYSICS. Proceedings of the Ninth Asia-Pacific International Conference. Held 29 June-2 July 2009 in Wuhan,

Astronomy and Astrophysics

Astrophysics

G, Gravitational Constant, Torsion Pendulum, Time-Of-Swing Method, Precision Measurement

Scientific paper

A new determination of Newtonian gravitational constant G is presented by using a torsion pendulum with time-of-swing method. Features of the design include: (1) two SS316 stainless steel spheres with more homogeneous density were used as the source masses; (2) a rectangular glass block was used as the main body of the pendulum; (3) both the pendulum and source masses were set in a vacuum chamber to reduce the error of measuring the relative positions conveniently; (4) exchanging of the configurations between "near" and "far" positions was remotely operated by using a stepper motor; (5) the anelastic effect of the torsion fiber was first measured directly by using two disk pendulums with the help of a high-Q factor quartz fiber. We repeated the G measurements twice independently, and two G values have only a difference of 9 ppm. The combined final value of G was found to be (6.67349±0.00018) × 10-11 m3kg-1s-2 with a relative uncertainty of 26.33 ppm.

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