Calibration of the superconducting gravimeter based on a cold atom absolute gravimeter at NIM

Calibration of the superconducting gravimeter based on a cold atom absolute gravimeter at NIM

Qiyu Wang;Jinyang Feng;Shaokai Wang;Wei Zhuang;Yang Zhao;Lishuang Mou;Shuqing Wu

【期刊名称】《中国物理：英文版》 【年(卷),期】2024(027)012

【摘要】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·s?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·s?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. 【总页数】7页(286-292) 【关键词】

【作者】Qiyu Wang;Jinyang Feng;Shaokai Wang;Wei Zhuang;Yang Zhao;Lishuang Mou;Shuqing Wu

【作者单位】National Institute of Metrology, Beijing 100029, China;National Institute of Metrology, Beijing 100029, China;National Institute of Metrology, Beijing 100029, China;National Institute of Metrology, Beijing 100029, China;National Institute of Metrology, Beijing 100029, China;China Jiliang University, Hangzhou 310018, China;National Institute of Metrology, Beijing 100029, China 【正文语种】英文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_chinese-physics-b_thesis/0201270230770.html 【相关文献】

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