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Proceedings Paper

Precision evaluation of calibration factor of a superconducting gravimeter using an absolute gravimeter
Author(s): Jin-yang Feng; Shu-qing Wu; Chun-jian Li; Duo-wu Su; Jin-yi Xu; Mei Yu
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Paper Abstract

The precision of the calibration factor of a superconducting gravimeter (SG) using an absolute gravimeter (AG) is analyzed based on linear least square fitting and error propagation theory and factors affecting the accuracy are discussed. It can improve the accuracy to choose the observation period of solid tide as a significant change or increase the calibration time. Simulation is carried out based on synthetic gravity tides calculated with T-soft at observed site from Aug. 14th to Sept. 2nd in 2014. The result indicates that the highest precision using half a day’s observation data is below 0.28% and the precision exponentially increases with the increase of peak-to-peak gravity change. The comparison of results obtained from the same observation time indicated that using properly selected observation data has more beneficial on the improvement of precision. Finally, the calibration experiment of the SG iGrav-012 is introduced and the calibration factor is determined for the first time using AG FG5X-249. With 2.5 days’ data properly selected from solid tide period with large tidal amplitude, the determined calibration factor of iGrav-012 is (-92.54423±0.13616) μGal/V (1μGal=10-8m/s2), with the relative accuracy of about 0.15%.

Paper Details

Date Published: 26 January 2016
PDF: 7 pages
Proc. SPIE 9903, Seventh International Symposium on Precision Mechanical Measurements, 99031O (26 January 2016); doi: 10.1117/12.2214029
Show Author Affiliations
Jin-yang Feng, National Institute of Metrology (China)
Shu-qing Wu, National Institute of Metrology (China)
Chun-jian Li, National Institute of Metrology (China)
Duo-wu Su, National Institute of Metrology (China)
Jin-yi Xu, National Institute of Metrology (China)
Mei Yu, National Institute of Metrology (China)

Published in SPIE Proceedings Vol. 9903:
Seventh International Symposium on Precision Mechanical Measurements
Liandong Yu, Editor(s)

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