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Book: Studies in Applied Electromagnetics and Mechanics 8, Nondestructive Testing of Materials, Editors: R.Collins, W.D. Dover, J.R.Bowler and K. Miya, IOS Press, Amsterdam (1995), ISSN: 1383-7281, pp.211-222

Calculation of the Interaction of Fluxset Type ECT Probe and Crack Located in Metallic Plate

József Pávó(a), Imre Sebestyén(a), Gábor Vértesy(b), Csaba S. Daróczi(b) and Kenzo Miya(c)

(a) Dept. Electromagnetic Theory, Technical University of Budapest, H-1521 Budapest, Egry J. u. 18., Hungary
(b) Hung. Acad. Sci., Research Institute for Materials Science ATKI, H-1525 Budapest, P.O. Box 49, Hungary
(c) Nuclear Engineering Research Laboratory, The University of Tokyo, Tokai, Ibaraki, 319-11, Japan

In this paper a method used for the calculation of the signal picked up by a fluxset type eddy current testing (ECT) probe is discussed. The fluxset type ECT probe is made of a pancake type exciting coil and a fluxset sensor. The effect of the presence of the ferromagnetic core of the fluxset sensor on the eddy current field is studied by using two-dimensional finite element calculations. On the basis of this study it is concluded that the crack-probe interaction can be calculated by neglecting the presence of the ferromagnetic core. After the numerical solution of a boundary integral equation, the spatial Fourier transform of the magnetic field perturbation caused by the presence of a crack in the otherwise homogeneous conducting plate specimen is evaluated analytically. Based on this analytical expression, a fast method is used for the calculation of the signal picked up by the fluxset probe. The calculated results are compared with experimental ones.

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