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

作     者：Pengfei WU Lin WU Lifeng BAO Long WANG Bo WANG Danling TANG Pengfei WU;Lin WU;Lifeng BAO;Long WANG;Bo WANG;Danling TANG

作者机构：State Key Laboratory of Geodesy and Earth’s DynamicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China University of the Chinese Academy of SciencesBeijing 100049China Guangdong Remote Sensing Center for Marine Ecology and Environment(GDRS)Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2023年第41卷第2期

页      面：792-803页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.42192535,41876136) the Guangdong Special Support Program(No.2019BT02H594) 

主　　题：electromagnetic damping JMGrav marine gravimeter marine gravity survey 

摘      要：A new gravity sensor based on electromagnetic damping for the JMGrav marine gravimeter is *** new gravity sensor considered the advanced construction methods of the electromagnetic damping system of the *** design features of the new system are discussed and the research survey data in the South China Sea are *** 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 *** 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 1-1000 *** 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 *** accelerations cause discrepancies of approximately only 1 mGal between the static value and the mean dynamic *** sea tests were conducted in September *** measurements were taken with a JMGrav marine gravimeter onboard the R/V Dongfanghong 3,and the effective survey line exceeded 2000 *** irregular accelerations with peaks up to 100 Gal yielded a reduction of approximately 40 dB in *** survey data were evaluated using ocean gravity field models and grid line *** results show that the accuracy of the gravity measurements is better than 2 mGal.