Eddy Current Level II

Eddy current testing is a non-contact electromagnetic testing technique making use of electromagnetic induction to detect and characterize surface and sub-surface flaws in conductive materials.

An alternating magnetic field is created by an alternating current which is passed through a coil and thus inducing a localised current (eddy current) into the material under test.

If discontinuities such as fatigue cracks are present they will interrupt the flow of eddy currents and alter the terminal impedance of the test coil. The severity and exact location of any discontinuities can be found by the received signal. 

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