Theoretical analysis for the design of the French watt balance experiment force comparator

This paper presents a preliminary analysis for designing a force comparator to be used in the French watt balance experiment. The first stage of this experiment consists in a static equilibrium, by means of a mechanical beam balance, between a gravitational force (a weight of an artefact having a kn...

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Published inReview of scientific instruments Vol. 78; no. 9; p. 095108
Main Authors Pinot, Patrick, Genevès, Gerard, Haddad, Darine, David, Jean, Juncar, Patrick, Lecollinet, Michel, Macé, Stéphane, Villar, François
Format Journal Article
LanguageEnglish
Published United States 01.09.2007
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Abstract This paper presents a preliminary analysis for designing a force comparator to be used in the French watt balance experiment. The first stage of this experiment consists in a static equilibrium, by means of a mechanical beam balance, between a gravitational force (a weight of an artefact having a known mass submitted to the acceleration due to the gravity) and a vertical electromagnetic force acting on a coil driven by a current subject to the magnetic induction field provided by a permanent magnet. The principle of the force comparison in the French experiment is explained. The general design configuration of the force balance using flexure strips as pivots is discussed and theoretical calculation results based on realistic assumptions of the static and dynamic behaviors of the balance are presented.
AbstractList This paper presents a preliminary analysis for designing a force comparator to be used in the French watt balance experiment. The first stage of this experiment consists in a static equilibrium, by means of a mechanical beam balance, between a gravitational force (a weight of an artefact having a known mass submitted to the acceleration due to the gravity) and a vertical electromagnetic force acting on a coil driven by a current subject to the magnetic induction field provided by a permanent magnet. The principle of the force comparison in the French experiment is explained. The general design configuration of the force balance using flexure strips as pivots is discussed and theoretical calculation results based on realistic assumptions of the static and dynamic behaviors of the balance are presented.
Author Villar, François
Juncar, Patrick
Genevès, Gerard
David, Jean
Haddad, Darine
Macé, Stéphane
Lecollinet, Michel
Pinot, Patrick
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  fullname: Villar, François
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