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A Study on Direct Current Measurement Using Magneto-Optical LMF Method  

Lee, Jin-Yi (Department of Information, Control & Instrumentation Engineering, Chosun University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.24, no.6, 2004 , pp. 566-572 More about this Journal
Abstract
It is necessary to measure the direct current with a non-contact methodology for the liquid or gas phase, as welt as the conducting metals. This paper described a theoretical consideration and experimental verification for a non-contact quantitative direct current measurement system using the Faraday effect and magnetic flux leakage. The leakage of magnetic flux occurs around a gap when a ferromagnetic core including the discontinuous gap is magnetized. Two large anisotropic domains in a magneto-optical film are occurred by the vertical component of leaked magnetic flux and the domain walls are paralleled to the center of the gap. Here, the symmetrical arrangement of domains are deflected when a vertical magnetic field is applied to the magneto-optical film. The domain wall of the magneto-optical film are relocated when a measuring current passes through the ferromagnetic core. Therefore, a direct current passing through the core can be determined quantitatively by the measurement of moving distance of the domain wall.
Keywords
direct current; non-contact; current measurement; Faraday effect; magneto-optic; leakage magnetic flux;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 N. Itoh, et. al., 'Photomagnetic field sensor and photocurrent sensor using the same,' Japanese patents, P2000-230968A, (2000)
2 M. Kaneko, T. Okamoto, H. Tamada and T. Yamada, 'Optical operation of a magnetic bubble,' IEEE Transactions of Magnetics, Vol. MAG-22, No.1, pp. 2-10, (1986)   DOI
3 R. J. Gambino and T. R. McGuire, 'Enhanced magneto-optic properties of light rare-earth-transition metal amorphous alloys,' Journal of Magnetism and Magnetic Materials, Vol. 54-57, pp. 1365-1370, (1986)
4 J. Lee, T. Shoji and D. Seo, 'Theoretical Consideration of Nondestructive Testing by use of Vertical Magnetization and Magneto-Optical Sensor,' KSME International Journal, Vol. 18, No.4, pp. 640-648, (2004)   과학기술학회마을   DOI
5 O. Kamada, H. Minemoto and N. Itoh, 'Magneto-optical properties of (BiGdY)3Fe5O12 for optical magnetic field sensors,' Journal of Applied Physics, Vol. 75, No. 10, pp. 6801-6803, (1994)   DOI   ScienceOn
6 M. Ishihara, T. Sakamoto, K. Haruna, N. Nakamura, K. Machida and Y Asahara, 'Advanced Magnetic Flux Leakage Testing System Using Magneto-optical Film,' JSNDT, Vol. 45, No.4, pp. 283-289, (1996)
7 G. L. Fitzpatrick, D. K. Thome, R. L. Skaugset, E. Y. C. Shih and W. C. L. Shih, 'Magneto-Optic/Eddy Current Imaging of Aging Aircraft,' Material Evaluation, Vol. 51, No. 12, pp. 1402-1407, (1993)
8 M. Kawakami and S. Yamaguchi, '직류전류센서', 대한민국특허, 특1994-0005959, (1994)
9 M. Kawakami, '직류전류센서', 대한민국특허, 특1995-0020819, (1995)
10 E. Sawatzky and E. Kay, 'Some Magnetic and Structural Properties of Epitaxial Garnet Films Prepared by rf Sputtiering,' Journal of Applied Physics, Vol. 40, No.3, pp. 1460-1462, (1969)   DOI
11 F. Schmidt, W. Rave and A. Hubert, 'Enhancement of Magneto-Optical Domain Observation by Digital Image Processing,' Vol. MAG-21, No.5, pp. 1596-1598, (1985)
12 J. Lee, S. Lyu and Y. Nam, 'An algorithm for the characterization of surface crack by use of dipole model and magneto-optical non-destructive inspection system,' KSME International Journal, Vol. 14, No. 10, pp. 1072-1080, (2000)
13 M. Kawakami and S. Yamaguchi, '직류전류센서', 대한민국특허, 특1995-0012078, (1995)
14 J. Lee, T. Shoji, D. Minkov and M. Ishihara, 'Novel NDI by use of magneto-optical film,' Transactions of the Japan Society of Mechanical Engineers, Vol. 64, No. 619, pp. 825-830, (1998)
15 김수길, 이용욱, 이병호, 송민호, 임용훈, 'Faraday 효과를 이용한 클램프형 광-전류 변류기의 특성 및 분석', 한국광학회지, Vol. 14, No.4, pp. 399-405, (2003)