Royal Observatory of Belgium Gravitational balance ...
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... Mehr ...
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Dokumenttyp: | Artikel |
Erscheinungsdatum: | 2014 |
Verlag/Hrsg.: |
arXiv
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Schlagwörter: | Instrumentation and Detectors physics.ins-det / FOS: Physical sciences |
Sprache: | unknown |
Permalink: | https://search.fid-benelux.de/Record/base-28967594 |
Datenquelle: | BASE; Originalkatalog |
Powered By: | BASE |
Link(s) : | https://dx.doi.org/10.48550/arxiv.1409.8016 |
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. ... : IAG symposium on terrestrial gravimetry: static and mobile measurements. 22-25 June, Saint Petersburg, Russia ...