Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

Eddy current methods are a widely used technique in the nondestructive inspection of aircraft structures and parts. The method consists of inducing eddy-currents in the material being tested using a probe coil. The magnetic field produced by these eddy-currents opposes that of the probe coils (Lenz’s law) and the net effect is a reduced magnetic flux linking the coil. The presence of defects in the material under test disturbs the distribution of eddy-currents which in turn disturbs the net field. This change in the field is detected as a change in the impedance of the coil. The changes in coil impedance measured as the probe scans the specimen contitutes an eddy current defect signal

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16A

Chapter

Chapter 1: Standard Techniques

Section

Eddy Currents

Pages

201-208

DOI

10.1007/978-1-4615-5947-4_26

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Finite Element Modeling of Eddy Current Probes for Edge Effect Reduction

Brunswick, ME

Eddy current methods are a widely used technique in the nondestructive inspection of aircraft structures and parts. The method consists of inducing eddy-currents in the material being tested using a probe coil. The magnetic field produced by these eddy-currents opposes that of the probe coils (Lenz’s law) and the net effect is a reduced magnetic flux linking the coil. The presence of defects in the material under test disturbs the distribution of eddy-currents which in turn disturbs the net field. This change in the field is detected as a change in the impedance of the coil. The changes in coil impedance measured as the probe scans the specimen contitutes an eddy current defect signal