Pulsed eddy current method development for hidden corrosion in aircraft structures

It has been demonstrated that PEC has very high potential for applications in corrosion detection and characterization. Its most powerful advantage over conventional eddy current is the ability to capture broadband frequency information within a single transient signal. Consequently, when analyzed p...

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Bibliographic Details
Published in:E-journal of Nondestructive Testing 1999-01, Vol.4 (1), p.17-17
Main Authors: Lepine, B A, Wallace, B P, syth, D S, Wyglinski, A
Format: Article
Language:English
Online Access:Get full text
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Summary:It has been demonstrated that PEC has very high potential for applications in corrosion detection and characterization. Its most powerful advantage over conventional eddy current is the ability to capture broadband frequency information within a single transient signal. Consequently, when analyzed properly, PEC scans contain valuable depth information essential for characterizing corrosion in aircraft structures. The time-based signals are more intuitive and can be displayed in various formats presently used in ultrasonic NDT. The A-, B- and C-scans function well as complimentary methods for presenting data when simple variations in test parameters occur; these displays can become very complex and confusing, however, when combinations of such variations occur simultaneously. The PEC system demonstrated a sensitivity of at least 5% total metal loss, or 0.05 mm thinning, in the second layer. Smaller levels of corrosion and deeper penetration may be achieved with optimized probe designs and test parameters, such as excitation current shape and frequencies.
ISSN:1435-4934
1435-4934