Numerical approach for ECT by using boundary element method with Laplace transform

This paper presents an inverse analysis by using BEM with Laplace transform. The method is applied to a simple problem in the eddy current testing (ECT). Some crack shapes in a conductive specimen are estimated from distributions of the transient eddy current on its sensing surface and magnetic flux density in the lift-off space. Because the transient behavior includes information on various frequency components, the method is applicable to the shape estimation of a comparatively small crack.