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| Optimum Design of a Non-Destructive Testing System to Maximize Magnetic Flux Leakage |
| Journal of Magnetics, Volume 6, Number 1, 31 Mar 2001, Pages 31-35 |
| G. S. Park(Dept. Electrical Engineering, Korea Maritime Univ.), P. W. Jang(Dept. Physcs, Chongju Univ.), Y. W. Rho(KOGAS R&D center) |
| Abstract |
| This paper describes the design method of a magnetic system to maximize the magnetic flux leakage (MFL) in a non-destructive testing (NDT) system. The defect signals in a MFL type NDT system mainly depend on the change of the magnetic leakage flux in the region of a defect. The characteristics of the B-H curves are analysed and a design method to define the operating point on B-H curves for maximum leakage is performed. The computed MFL signal by a nonlinear finite element method is verified by measurement using Hall sensors mounted on the 6 legs PIG, the traveling detector unit in gas pipe, in an 8 inch test tube with defects. The rhombic defects could be successfully identified from the defect signals. |
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| Full Text: PDF |
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