Calculations of the Flaw Signal Generated by a Differential Eddy-Current Probe

Date
1990
Authors
Jenkins, S.
Bowler, J.R.
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Altmetrics
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Abstract

Differential eddy-current probes are attractive because of their insensitivity to lift-off effects. By using two similar coils wound in opposition we have a sensor that detects variations in the magnetic field along a line joining their centers. The impedance plane response of a differential probe to a flaw is rather more complicated than the signal from a single winding probe, but this is a price one must be prepared to pay for nullifying the lift-off signal.

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