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Calibration of the superconducting gravimeter based on a cold atom absolute gravimeter at NIM |
| Qiyu Wang(王启宇)1, Jinyang Feng(冯金扬)1, Shaokai Wang(王少凯)1, Wei Zhuang(庄伟)1, Yang Zhao(赵阳)1, Lishuang Mou(牟丽爽)2, Shuqing Wu(吴书清)1 |
1 National Institute of Metrology, Beijing 100029, China;
2 China Jiliang University, Hangzhou 310018, China |
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Abstract The scale factor of a superconducting gravimeter (SG) is usually calibrated by using simultaneous and co-located gravity measurements with the FG5-type absolute gravimeter (AG). In this paper, another new kind of absolute gravimeter-cold atom gravimeter (CAG) is first reported to calibrate the SG. Five-day side-by-side gravity measurements have been carried out by using our CAG (NIM-AGRb-1) to calibrate the SG (iGrav-012) located at Changping Campus of the National Institute of Metrology (NIM) of China. A weighted least-squares method is applied to determine the scale factor and the result is given as (-928.01±0.73) nm·-2·V-1 with a precision of 0.79‰. We have demonstrated that a calibration precision of 1‰ level can be achieved after 3 days of parallel observations at spring tide. The obtained calibration results are then compared with the previous calibration by FG5X-249, which shows that the calibration precision obtained by using NIM-AGRb-1 was slightly higher than FG5X-249 with the same time interval. The factors affecting the calibration precision are analyzed in the calibrations by means of different AGs. Finally, several calibration experiments for SG iGrav-012 are discussed. The final scale factor is estimated as (-927.58±0.36) nm·-2·V-1 with an accuracy of 0.39‰. Our main results demonstrate that the CAGs can be used for high-precision calibrations of SGs.
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Received: 08 June 2018
Revised: 25 September 2018
Accepted manuscript online:
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PACS:
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37.25.+k
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(Atom interferometry techniques)
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91.10.Pp
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(Geodetic techniques; gravimetric measurements and instruments)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFF0200103 and 2016YFF0200200) and the Fundamental Research Funds for National Institute of Metrology, China (Grant No. 22-AKY1608). |
Corresponding Authors:
Shuqing Wu
E-mail: wushq@nim.ac.cn
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Cite this article:
Qiyu Wang(王启宇), Jinyang Feng(冯金扬), Shaokai Wang(王少凯), Wei Zhuang(庄伟), Yang Zhao(赵阳), Lishuang Mou(牟丽爽), Shuqing Wu(吴书清) Calibration of the superconducting gravimeter based on a cold atom absolute gravimeter at NIM 2018 Chin. Phys. B 27 123701
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