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557 views Technical Discussions wave wave 08:08 May-31-2006 ask Whoever can explain "Edge effect" in eddy current inspection for me?    Reply  Translate  Close   Jeff Medford NDT Inspector Nucor Steel, USA, Joined Apr 2005, 6 Jeff Medford NDT Inspector Nucor Steel, USA, Joined Apr 2005 6 08:32 Jun-06-2006 Re: ask It very basic!!! As you get closer to the edge of a test material you eddy current field is compressed in turn increasing your resisitance. In turn that effects your impedence point. Simple. I have performed numerous inspection while having some sort of edge effect. It is no where written that is a follow practice but it is done. As long as you know the effects playing on your inspection. Your good. Just kidding stick to the proceedures and you can go wrong ----------- Start Original Message ----------- : Whoever can explain "Edge effect" in eddy current inspection for me? ------------ End Original Message ------------    Reply  Translate  Close   Thomas Murphy NDT Inspector USA, Joined Jul 2000, 16 Thomas Murphy NDT Inspector USA, Joined Jul 2000 16 05:23 Jun-08-2006 Re: ask Is this really true? I would think that the inductive reactance would increase, increasing the impedance. Maybe someone could tell me why I am wrong. The coil parameters are presumed not to have changed. Any help would be appreciated. Tom ----------- Start Original Message ----------- : It very basic!!! As you get closer to the edge of a test material you eddy current field is compressed in turn increasing your resisitance. In turn that effects your impedence point. Simple. I have performed numerous inspection while having some sort of edge effect. It is no where written that is a follow practice but it is done. As long as you know the effects playing on your inspection. Your good. Just kidding stick to the proceedures and you can go wrong : : Whoever can explain "Edge effect" in eddy current inspection for me? ------------ End Original Message ------------    Reply  Translate  Close

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