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.