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Modeling and analysis of magnetic dipoles in
weak magnetic field |
| WANG Zhaoxia1, ZHANG Weimin2, LIU Hongguang3 |
| 1.Beijing Dwell Petroleum & Gas Development Company Ltd; 2.School of Mechanical and Vehicular Engineering, Beijing Institute of Technology; 3.School of Material Science and Technology, Beijing Forestry University |
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Abstract The magnetic leakage field distribution resulting from linear defects of a tube sample in the geomagnetic field is modeled according to the magnetic dipole theory. The formula to compute the normal component of the weak magnetic field is deduced based on the spatial distribution of the magnetic dipole. The shape and characteristics of the zero line (an important criterion for magnetic memory testing) of the normal field is analyzed under different longitudinal magnetizations. Results show that the characteristics of the zero line should be considered when the metal magnetic memory testing method is used to find and locate the defect.
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Issue Date: 05 June 2008
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