A calibration system for superconducting gravimeters |
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| Authors: | Vladimiro Achilli Paolo Baldi Giuseppe Casula Mario Errani Sergio Focardi Marco Guerzoni Federico Palmonari Giuseppe Raguní |
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| Affiliation: | (1) Istituto di Topografia, University of Bologna, Italy;(2) Dipartimento di Fisica-Settore Geofisica, University of Bologna, Viale Berti-Pichat n.8, I-40126 Bologna, Italy;(3) Istituto Nazionale di Geofisica, Roma, Italy;(4) Istituto Nazionale di Geofisica, Bologna, Italy |
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| Abstract: | A new method for the calibration of a superconducting gravity meter is described, in which a 273 Kg annular mass is placed around the meter and is moved up and down. The geometry of the apparatus is easy to model and the accuracy in the computation of the gravity variation induced by the mass, 6.7µgal, is limited only by the accuracy in the knowledge of value of the gravitational constant. Measurements done in  91 and 92 for the calibration of the instrument GWR-T015 are described. The calibration factor has been determined with a precision of about 0.3%. |
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