A marine gravimeter based on electromagnetic damping and its tests in the South China Sea

Pengfei WU; Lin WU; Lifeng BAO; Long WANG; Bo WANG; Danling TANG

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A marine gravimeter based on electromagnetic damping and its tests in the South China Sea

Marine Scientific Instruments | Updated：2024-10-12

- A marine gravimeter based on electromagnetic damping and its tests in the South China Sea
- A marine gravimeter based on electromagnetic damping and its tests in the South China Sea
- 海洋湖沼学报(英文) 2023年41卷第2期页码：792-803
- Affiliations：
  
  1.State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China
  2.University of the Chinese Academy of Sciences, Beijing 100049, China
  3.Guangdong Remote Sensing Center for Marine Ecology and Environment (GDRS), Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
  4.School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China
- Author bio：
  
  linwu@apm.ac.cn
  baolifeng@apm.ac.cn
- Funds：
  
  the National Natural Science Foundation of China(42192535;41876136);the Guangdong Special Support Key Team Program(2019BT02H594)
- DOI：
  中图分类号：
- 收稿：2022-03-23，
  
  纸质出版：2023-03-01
- Accepted：
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A marine gravimeter based on electromagnetic damping and its tests in the South China Sea[J]. 海洋湖沼学报(英文), 2023,41(2):792-803.

WU Pengfei,WU Lin,BAO Lifeng,et al.A marine gravimeter based on electromagnetic damping and its tests in the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):792-803.
A marine gravimeter based on electromagnetic damping and its tests in the South China Sea[J]. 海洋湖沼学报(英文), 2023,41(2):792-803. DOI：

WU Pengfei,WU Lin,BAO Lifeng,et al.A marine gravimeter based on electromagnetic damping and its tests in the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):792-803. DOI：

摘要

Abstract

A new gravity sensor based on electromagnetic damping for the JMGrav marine gravimeter is presented. The new gravity sensor considered the advanced construction methods of the electromagnetic damping system of the gravimeter. The design features of the new system are discussed and the research survey data in the South China Sea are shown. Numerical simulations are applied to model the magnetic and mechanical characteristics of the system using finite element analysis and to evaluate the force distribution and the resulting damping effects. The performance characteristics of the system were tested on a motion simulator in laboratory

and the gravimeter was subjected to vertical accelerations of up to 100 Gal in 1–1 000 s. It was found that the amplitude reduction of vertical accelerations in 3–15 s is 30–45 dB

with a time lag of 2–5 s

while the effect on gravity in period greater than 600 s is less than 0.5 dB

with a time lag of less than 100 s. The accelerations cause discrepancies of approximately only 1 mGal between the static value and the mean dynamic value. The sea tests were conducted in September 2020. Gravity measurements were taken

with a JMGrav marine gravimeter onboard the R/V

Dongfanghong

and the effective survey line exceeded 2 000 km. Completely irregular accelerations with peaks up to 100 Gal yielded a reduction of approximately 40 dB in amplitude. The survey data were evaluated using ocean gravity field models and grid line tests. The results show that the accuracy of the gravity measurements is better than 2 mGal.

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references

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