Royal Observatory of Belgium Gravitational balance

Le résumé fourni par la source

An astatized symmetrical vertical pendulum is monitoring torque Γ(M) resulting of gravitational attractions exerted by two external masses M moving up down. Local gravity field g produce the main pendulum restoring torque combined with a very weak variable torque Γ(c) induced by rotation of watch needles fixed to the pendulum. Transfer of fundamental units to calibrate the Γ(c) torques is obtained by a reference torque Γ(μ) resulting of precise displacements of a well known mass μ. We permanently monitored ratio between the gravitational effect Γ(M) and calibrated Γ(c) to determine G. Position of the pendulum is measured with a capacitive bridge. Bias voltages sent to two electrodes set-up at the bottom of the pendulum allows to feedback pendulum with a controlled electrostatic torque. We discuss potential interest of our prototype to design a multi pendulum system to check systematic effects for different geometries and various kinds of materials.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.