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《Chinese Journal of Geophysics》 1982-05
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MAGNETIZATION DISTRIBUTION OF 3-DIMENSIONAL BODIES OF HIGH SUSCEPTIBILITY

WU XUAN-ZHI LIU XIN-ZHu(Institute of Mineral Deposits, Chinese Academy of Geological Sciences)  
A magnetic body confined by non-quadric surfaces is magnetized inhomogeneously due to its demagnetization, even if it has constant susceptibility or lies in a homogeneous field. It is of interest to know how homogeneous the magnetization is and how to calculate its distribution. Solutions of these questions will benefit the direct problem in magnetic prospecting and the interpretation in well logging.In the present paper a numerical method is discussed which is used to calculate magnetization of an arbitrarily shaped body with high susceptibility in a stable field. Inhomogeneity caused by demagnetization is shown. With principal sections of cuboids as an example, the paper illustrates the characteristics of demagnetization distribution in detail.In practice, magnetic bodies are frequently of simple form whose magnetization variations are not, significant. Such bodies are designated as "relatively homogeneous" bodies. To define their magnetization distribution an approximate formula is deduced. When observed points are quite far from magnetic bodies in question, the bodies can be regarded as homogeneous. A new concept of "apparent demagnetization coefficient'' is proposed and its availability is discussed. In the end, a series of demagnetization coefficients of cuboids are given.
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【References】
Chinese Journal Full-text Database 2 Hits
1 Xu Baoci;THE PROBLEM OF HETEROGENEOUS MAGNETIZATION FORF HOMOGENEOUS:NON-QUADRATIC SURFACE MAGNETIC BODY[J];;1982-02
2 WANG SHU-HUI (Beijing Institute of Resource and Geology, China National Non-ferrous Metal Industry Corporation);FINITE ELEMENT-BOUNDARY ELEMENT METHOD USED TO SOLVE THE DIRECT PROBLEM OF MAGNETIC PROSPECTING UNDER COMPLICATED CONDITIONS[J];Chinese Journal of Geophysics;1985-06
【Citations】
Chinese Journal Full-text Database 1 Hits
1 Fang ttua-chu (Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences);CALCULATION OF A MAGNETIC ANOMALY BY THREE DIMENSIONAL BODIES OF HIGH SUSCEPTIBILITY WITH ARBITRARY SHAPES[J];Acta Geological Sinica;1978-01
【Co-citations】
Chinese Journal Full-text Database 1 Hits
1 LIU Da-ming, GUO Cheng-bao (College of Electrical and Information Eng., Naval Univ. of Engineering, Wuhan 430033, China);Prediction technique of space magnetic field of non-magnetic building[J];Journal of Naval University of Engineering;2005-01
China Proceedings of conference Full-text Database 1 Hits
1 Liu Xinzhu Wu Xuanzhi Dong Yingjun;THE NUMERICAL SOLUTION OF THE STATIC ELECTRIC FIELD AND ITS APPLICATIONS[A];[C];1981
【Co-references】
Chinese Journal Full-text Database 1 Hits
1 WANG SHU-HUI(Beijing Geological Institute, Ministry of Metallurgical Industry);THE DIRECT PROBLEM OF MAGNETIC PROSPECTING UNDER ANISOTROPIC CONDITION AND THE SOLUTION TO SOLVE IT[J];Chinese Journal of Geophysics;1983-01
【Secondary References】
Chinese Journal Full-text Database 2 Hits
1 WANG REN (Department of Mechanics,Peking University,Beijing 100871);APPLICATION AND DEVELOPMENT OF FINITE ELEMENT AND OTHER NUMERICAL SIMULATION METHODS IN EARTH SCIENCES IN CHINA[J];Chinese Journal of Geophysics;1994-S1
2 Shen Ninghua(Changchun College of Geology);SCIENTIFIC AND TECHNICAL ADVANCES IN MAGNETICPROSPECTING[J];Geophysical and Geochemical Exploration;1989-05
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