Browse > Article

Study on the Distortion of Detecting Signals with the Multi-Defects in Magnetic Flux Leakage System  

Seo, Kang (부산대학 전기공학과)
Kim, Dug-Gun (부산대학 전자전기공학과)
Han, Jea-Man (부산대학 전자전기공학과)
Park, Gwan-Soo (부산대학 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.56, no.5, 2007 , pp. 876-883 More about this Journal
Abstract
The magnetic flux leakage(MFL) type nondestructive testing(NDT) method is widely used to detect corrosion, defects and mechanical deformation of the underground gas pipelines. The object pipeline is magnetically saturated by the magnetic system with permanent magnet and yokes. Hall sensors detect the leakage fields in the region of the defect. The defects are sometimes occurred in group. The accuracy of the detecting signals in this defect cluster become lowered because of the complexity of the defect cluster. In this paper, the effects of the multi -defects are analyzed. The detecting signals are computed by 3-dimensional finite element method and compared with real measurement. The results say that, rather than the size of the defects, the effects of the relative position of the multi-defects are very important on the detecting signals.
Keywords
Nondestructive Testing(NDT); Magnetic Flux Leakage(MFL); Finite Element Method(F.E.M); Pipeline Inspection; Corrosion;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 0
연도 인용수 순위
1 S. Mandayam, L. Udpa, S. S. Udpa and W. Lord, 'Wavelet-based permeability compensation technique for characterizing magnetic flux leakage images' Data', NDT&E International, Vol. 30, No.5, pp. 297- 303, 1997   DOI
2 G.S.Park, P.W.Jang, Y.W.Rho, 'Optimum Design of a Non-Destructive Testing System to Maximize Magnetic Flux Leakage', Journal of Magnetics, vol.6, no. 1, pp. 31-35, March 2001   과학기술학회마을
3 Gwan Soo Park and Eun Sik Park, 'Improvement of the Sensor System in Magnetic Flux Leakage Type Nondestructive Testing(NDT)', IEEE Trans. Magn., Vol.38, No.2, pp. 1277-1280, March 2002   DOI   ScienceOn
4 H. Haines et aI., 'Advanced MFL signal analysis aids pipe corrosion detection', Pipeline & Gas Industry, pp. 49-63, March 1999
5 J. Bruce Nestleroth, Steven W. Rust, and David A. Burgoon, 'Determining Corrosion Defect Geometry from Magnetic Flux Leakage PIG Data', The NACE International Annual Conference and Exposition CORROSION 96, Paper No. 44, pp. 1-11, 1996