In order to ensure the safe operation of wire ropes, non-destructive testing methods are being applied to inspect wire ropes. Any geometrical discontinuity in magnetic permeability in the magnetized wire rope will impact the magnetic field conveyed by the rope, under a proper excitation. In this work, the electromagnetic device known as "parametric transformer" has is proposed for the non-destructive testing of ferromagnetic bodies having cylindrical symmetry, as tubes and ropes. The principle of its functioning is described by means of an equivalent magnetic network and a more rigorous approach using the Partial Element Equivalent Circuit (PEEC) method. Then, the proposed principle has been tested experimentally through the realization of a model which has confirmed the expected results.
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