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I heard it was possible to detect a flaws in conductive materials using two coils carrying the same current in opposite directions.

More precisely, I read it was possible to do so by moving a conductive material at a constant speed on the axis of the two coils, and by measuring the voltage on a third smaller coil (also placed on the same axis).

I understand that the first two coils create a magnetic field, and that moving the material will therefore cause eddy currents. I also get that the presence of flaws will change those currents.

But concretely, how will we be able to know whether the conductive material does or does not have flaws ?

Thank you for your help.

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    $\begingroup$ Eddy current testing $\endgroup$ – Farcher Jun 5 at 8:34
  • $\begingroup$ Thank you, I have already read this. But still, I am not sure I understand what is supposed to be seen on the voltmeter as the conductive material is moving. $\endgroup$ – JackEight Jun 5 at 8:38
  • $\begingroup$ There are many more detail webpage and videos and here is an example. $\endgroup$ – Farcher Jun 5 at 13:17

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