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Eddy Current Testing

is based on the principle of electromagnetic induction.

The interaction of the magnetic field produced by an alternating current through a coil with conducting materials in its' vicinity produces a current in these materials which tends to oppose the incident magnetic field. The net effect can be measured as an impedance  change in the coil through which the alternating current is passed.

Component material properties such as conductivity and permeability as well as  geometry  spatial relationships between the coil and the conductor will all affect the extent of production of eddy currents and hence the observed impedance change in the coil. The NDE method of eddy current testing technique can be used for applications such as flaw detection, conductivity measurements, coating thickness, & metal film thickness.

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