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Eddy current method (amplitude sensitive)

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The amplitude sensitive eddy current method for measuring coating thickness  according to ISO 2360 is similar to the magnetic induction method.


This procedure is used to measure the coating thickness of electrically non-​conductive and non-​magnetic coatings on a non-​ferro-magnetic, electrically charged base material (NF metal). How does the amplitude sensitive eddy current method work? An exciter current is first used to generate a high frequency magnetic field. This results in conductive, non-​magnetic base material eddy currents. The strength of these eddy currents is dependent on the distance or coating thickness. between the measuring probe and the base material. The measurement signal created by the eddy current is then transformed into the precise coating thickness value.



Illustration of the principle of the amplitude sensitive eddy current method.