A new type of compact gravimeter for long-term absolute gravity monitoring. (8th February 2019)

• Record Type: Journal Article
• Authors: Fu, Zhijie; Wu, Bin; Cheng, Bing; Zhou, Yin; Weng, Kanxing; Zhu, Dong; Wang, Zhaoying; Lin, Qiang
• Is Part Of: Metrologia. Volume 56:Number 2(2019:Apr.)
• Publication Date: 2019-02-08
• Subjects: compact gravimeter -- atom interferometry -- long-term absolute gravity monitoring; Weights and measures -- Periodicals; Weights and Measures -- Periodicals; 530.805
• DOI: 10.1088/1681-7575/aafcc7
• Languages: English
• ISSNs: 0026-1394

Abstract

Abstract: Long-term absolute gravity monitoring has a wide range of applications in the field of geodesy, geophysics, seismology, volcanology, hydrology, etc. The traditional method of long-term absolute gravity monitoring is realized by the combination of absolute gravimeter and relative gravimeter. Here we report on a new type of compact gravimeter based on atom interferometry used for long-term absolute gravity measurements. The long-term absolute gravity monitoring could be carried out with only a single instrument. Over the course of a month we took long-term absolute gravity measurements in a seismic station. With an interrogation time of 120 ms and a repetition rate of 2 Hz, the sensitivity of our cold atom gravimeter reaches 300 without any vibration isolation system, and the gravity residual fluctuations are within ±60 µGal.