FINITE-ELEMENT CALCULATIONS FOR EDDY-CURRENT INTERACTIONS WITH COLLINEAR SLOTS

The results of finite element calculations detailing the interactions of eddy currents with fine collinear slots in nonferromagnetic and ferromagnetic conductors are presented. These are applicable to both remote field eddy current inspection tools and conventional reflected impedance eddy current probes. The calculations show that, while fine slots have little interaction with collinear induced currents in nonferromagnetic conductors, there are much larger effects in ferromagnetic conductors. This is due to magnetic field interactions. The term ''eddy current inspection'' is therefore somewhat restrictive and the much broader term ''electromagnetic inspection'' is proposed.