publication . 0044 . 1994

Analytical methods in eddy-current non-destructive evaluation.

Harfield, Nicola.;
Open Access English
  • Published: 01 Jan 1994
Abstract
The two-dimensional problem of a long crack in a non-magnetic, half-space conductor lying perpendicular to the flow of eddy-currents induced by a one-dimensional external current sheet is studied in the context of eddy-current non-destructive evaluation. Impedance changes due to closed, surface-breaking cracks and deep, subsurface cracks are calculated. The Wiener-Hopf technique is used to obtain an approximate solution for the magnetic field scattered by a subsurface crack and hence the impedance change. The solution is accurate to within 5% for cracks whose edges lie more than one electromagnetic skin depth (delta) below the conductor surface. For the surface-...
Subjects
arxiv: Physics::GeophysicsPhysics::Classical Physics
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