TITLE

Remote field eddy current inspection for groove sizing—choice of a direct model structure

AUTHOR(S)
Fleury, G.; Davoust, M.-E.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p541
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The remote field eddy current (RFEC) technique is used to inspect conductive pipes from the inside. This technique is known to be sensitive to internal and external flaws. The RFEC mechanism is now well understood and is particularly convenient for ferromagnetic material testing. Many classical methods may be used to characterize defects by eddy current measurement, such as Lissajous’ curve examinations of impedance plane viewing. Those methods are not suitable for quantitative evaluation because the relation between the measured quantities (coil impedance, induced voltage) and crack dimensions is generally unknown. In that context, a number of parametric inversion methods have been previously developed. Those methods need the knowledge of the relationship between the physical quantities (here, length and depth of grooves) and the observed data. In our case, the output of a finite-element code stands for the observed data. Taking account of the symmetry property and limit variations of the data, several algebraic functions may be considered. For each model structure, several parameterizations are feasible. Some criteria are developed to obtain the best parameterization, regarding an identification purpose. Once the best model is chosen, an estimation of the groove dimensions is eventually proposed. © 2000 American Institute of Physics.
ACCESSION #
6029084

 

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