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Communication dans un congrès

Accurate Gravimetry at the BIPM Watt Balance Site

Abstract : Associated with the 8th International Comparison of Absolute Gravimeters (ICAG) at the Bureau International des Poids et Mesures (BIPM) in 2009, accurate gravity measurements were made to support the BIPM watt balance (WB) project, aiming at determining the Planck constant h for the future realization of a new definition of the kilogram based on the Planck constant and the accurate g values. The ICAG 2009 was organized as a metrological Key Comparison (KC) as defined by the Committee International des Poids et Mesures (CIPM) Mutual Recognition Arrangement (MRA). Its results will thus constitute a precise and consistent gravity reference in SI units which then can be used as the global basis for geodetic, geophysical and metrological observations of gravity. Four absolute and six relative gravimeters took part in the WB gravity campaign. Their results can therefore be converted to the international reference of the KC results, i.e., they are SI-traceable. The WB network is a 3-D grid over the site in the WB laboratory. In order to monitor the stability of the sites, repeated precise leveling has being carried out. In addition, a set of accurate Earth tide parameters were determined based on six months of gravimetric tidal observations. They will enable the tidal prediction, which is needed in order to use gravity values to produce the momentary values of the acceleration of free fall that are required by the WB experiment. We present in this paper the organization, the measurements, the data processing and the preliminary results.
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https://hal-brgm.archives-ouvertes.fr/hal-00599194
Contributeur : Philippe Jousset <>
Soumis le : mercredi 8 juin 2011 - 17:49:21
Dernière modification le : mercredi 23 septembre 2020 - 04:36:39

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  • HAL Id : hal-00599194, version 1

Citation

Z. Jiang, V. Palinkas, O. Francis, H. Baumann, M. Becker, et al.. Accurate Gravimetry at the BIPM Watt Balance Site. 2011 International Union of Geodesy and Geophysics (IUGG) General Assembly, Jun 2011, Melbourne, Australia. ⟨hal-00599194⟩

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