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Détermination absolue de g dans le cadre de l'expérience de la balance du watt

Abstract : The watt balance project aims to link the kilogram denition to the Planck constant h. The weighting of the mass involved requires a determination of the acceleration g with an uncertainty better than 10-8. This work aims to determine g with an atomic gravimeter and a dedicated gravimetric site. With a characterized relative gravimeter, a gravity mapping of the two pillars of the LNE experiment has been done and a model of the gravity variations has been performed. It gives an access to the gravity difference between two points in a 50 m3 volume above the pillars with an uncertainty lower than 3 µGal (3*10-8 m:.s-2). The gravity difference between the two centre points is lower than the µGal. The absolute determination of g is realized with a 87Rb matter wave gravimeter. Its conception is based on a work started on 2002 with the realization of a prototype which capabilities have been identied. The different elements of this new gravimeter are detailed in this work. The first signals were obtained in 2009. The device was the first atomic gravimeter to participate to an international comparison: ICAG'09 at BIPM. The characterization of the device has then been continued on the gravimetric pillar at LNE where the sensitivity reach a floor at 0.4 µGal in 100 min. The accuracy budget is 5.4 µGal, it was tested during a bilateral comparison with an FG5: the difference is (4.3 +- 6.2) µGal (k=1).
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Contributor : Sébastien Merlet <>
Submitted on : Monday, September 13, 2010 - 3:43:25 PM
Last modification on : Monday, December 14, 2020 - 9:52:54 AM
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  • HAL Id : tel-00517127, version 1


Sébastien Merlet. Détermination absolue de g dans le cadre de l'expérience de la balance du watt. Physique Atomique [physics.atom-ph]. Observatoire de Paris, 2010. Français. ⟨tel-00517127⟩



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