Location

Brunswick, ME

Start Date

1-1-1990 12:00 AM

Description

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.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

9A

Chapter

Chapter 4: Probes, Sensors, and Inspectability

Section

Inductive Probes

Pages

829-835

DOI

10.1007/978-1-4684-5772-8_105

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

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

Brunswick, ME

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.