Title :
A Perturbation Approach for the Modeling of Eddy Current Nondestructive Testing Problems With Differential Probes
Author :
Sabariego, Ruth V. ; Dular, Patrick
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Liege Univ.
fDate :
4/1/2007 12:00:00 AM
Abstract :
A perturbation technique applied to the finite element modeling of eddy current nondestructive testing (ECNDT) problems is developed for taking into account differential probes. It concerns a h-conform formulation. The source term of the formulation is directly determined by the projection of the unperturbed field in a relatively small region around the defect. The voltage change due to the presence of the flaw is calculated by performing an integral over the defect and a layer of elements in the exterior domain that touch its boundary. The considered test case involves a shielded differential probe scanning the surface of a metal specimen for the detection of flaws
Keywords :
eddy current testing; finite element analysis; magnetic fields; perturbation techniques; differential probe scanning shielding; differential probes; eddy current nondestructive testing problems; finite element model; h-conform formulation; metal specimen surface; perturbation approach; Eddy currents; Finite element methods; Impedance; Magnetic domains; Magnetic materials; Magnetic shielding; Nondestructive testing; Perturbation methods; Probes; Voltage; Eddy currents; finite element method; nondestructive testing; perturbation method;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.892398
