Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Previous research [1–4] has demonstrated that transient eddy-current (EC) techniques have significant advantages for the nondestructive evaluation (NDE) of hidden corrosion in multilayer aircraft structures when compared with conventional EC NDE. By sampling the time-domain response to a step or pulsed excitation using a high-speed digitiser, the probe response is effectively captured over a wide range of frequencies within a single measurement of only a few milliseconds duration, giving a very significant performance advantage over swept-frequency methods. In addition, direct measurement of the transient magnetic field (eg. using a Hall effect device), rather than the voltage induced in a pickup coil, allows transient EC NDE to probe more deeply into a multilayer structure compared to conventional EC techniques, giving improved sensitivity to deeply buried defects including hidden corrosion [1, 2, 5].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18B

Chapter

Chapter 5: Engineered Materials

Section

Composites

Pages

1401-1408

DOI

10.1007/978-1-4615-4791-4_180

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Characterization of Hidden Corrosion In Multilayer Aircraft Structures Using Transient Eddy-Current NDE

Snowbird, UT, USA

Previous research [1–4] has demonstrated that transient eddy-current (EC) techniques have significant advantages for the nondestructive evaluation (NDE) of hidden corrosion in multilayer aircraft structures when compared with conventional EC NDE. By sampling the time-domain response to a step or pulsed excitation using a high-speed digitiser, the probe response is effectively captured over a wide range of frequencies within a single measurement of only a few milliseconds duration, giving a very significant performance advantage over swept-frequency methods. In addition, direct measurement of the transient magnetic field (eg. using a Hall effect device), rather than the voltage induced in a pickup coil, allows transient EC NDE to probe more deeply into a multilayer structure compared to conventional EC techniques, giving improved sensitivity to deeply buried defects including hidden corrosion [1, 2, 5].