Electromagnetic field analysis in remote field eddy current testing systems

A model and a general nondestructive testing (NDT) and nondestructive evaluation (NDE) package are presented for developing and optimizing electromagnetic sensors. The package has been applied to sensors for remote field control and provides much information for optimizing, for example, the distance between excitation and measurement coils. Some precautions must be taken to obtain high-quality results. The mesh must be the same in order to compare materials with and without a crack. Also, in the NDT technique the measurement coil is far from the excitation coil, so that the study domain, including air, is very large. The quality of the results can be increased by coupling the finite-element method on this domain to the boundary integral equation for the exterior domain