TITLE

Pulsed eddy current: Finding corrosion independently of transducer lift-off

AUTHOR(S)
Gigue`re, Sylvain; Dubois, Ste´phane J. M.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p449
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The pulsed eddy current (PEC) technique holes the potential of becoming the primary means of detecting corrosion in multi-layer structures. However, it is still considered an experimental technique because there are stumbling blocks that must be overcome before it finds acceptance as a field application. In particular, it is necessary to be able to interpret the transient response and distinguish between transducer lift-off, defect locations, and defect size when these effects occur simultaneously. Thus far, most researchers in pulsed eddy currents have not considered lift-off variations in their studies. This parameter is kept constant as it complicates the analysis of pulsed eddy current transient responses. However, lift-off variations will be encountered during field inspections. This paper takes this issue into consideration. Specifically, the paper details an inspection technique which enables the positive identification of corrosion in a multi-layer structure. Moreover, the proposed technique provides a quantitative evaluation of material loss which is independent of lift-off variations. © 2000 American Institute of Physics.
ACCESSION #
6029098

 

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