Measurement of Newton's Constant Using a Torsion Balance in Angular Acceleration Feedback

Details Measurement of Newton's Constant Using a Torsion Balance in Angular Acceleration Feedback Measurement of Newton's Constant Using a Torsion Balance in Angular Acceleration Feedback

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.1783g&link_type=abstract

"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R

Physics

Scientific paper

We measured Newton's constant G using a new torsion balance method. Our technique greatly reduced several sources of uncertainty compared to previous measurements. An acceleration feedback leaves the torsion fiber untwisted, so that torsion fiber properties are unimportant. A thin and flat vertical plate was used as the pendulum to severly reduce uncertainties due to the pendulum density distribution. The attractor masses were rotated continously to reduce 1/f-noise and to separate the signal from lab-fixed gravitational sources. We obtained G = (6.674215 ± 0.000092) × 10-11 m3 kg-1 s-2.

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