26 January 2016 Precision evaluation of calibration factor of a superconducting gravimeter using an absolute gravimeter
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Proceedings Volume 9903, Seventh International Symposium on Precision Mechanical Measurements; 99031O (2016) https://doi.org/10.1117/12.2214029
Event: Seventh International Symposium on Precision Mechanical Measurements, 2015, Xia'men, China
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%.
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Jin-yang Feng, Jin-yang Feng, Shu-qing Wu, Shu-qing Wu, Chun-jian Li, Chun-jian Li, Duo-wu Su, Duo-wu Su, Jin-yi Xu, Jin-yi Xu, Mei Yu, Mei Yu, "Precision evaluation of calibration factor of a superconducting gravimeter using an absolute gravimeter", Proc. SPIE 9903, Seventh International Symposium on Precision Mechanical Measurements, 99031O (26 January 2016); doi: 10.1117/12.2214029; https://doi.org/10.1117/12.2214029
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