EDDY CURRENT NON-DESTRUCTIVE TESTING OF MAGNETIC TUBES

Ladislav Janoušek – Tomáš Marek – Daniela Gombárska – Klára Čápová

   The paper focuses on eddy current non-destructive testing of magnetic tubes. Remote field eddy current testing is concerned here. Basic principle of the method is explained and standard configurations of probes are listed. A new probe dedicated for the remote field inspection of a magnetic tube from its outer surface is designed. Simple arrangement composed from two outer encircling coils is chosen. Both the coils, ie the exciting coil and the pick-up one, are shielded with a magnetic material to gain the remote field effect in the considered configuration. The finite element method is used for numerical investigations. Presented results prove the effectiveness of the probe in the remote field inspection of the magnetic tube performed from its outer circumference.

Keywords: eddy currents, remote field, non-destructive testing, magnetic materials, probe, shield

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