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Groove dimensioning using remote field eddy current inspection*

Published online by Cambridge University Press:  15 September 2000

M.-E. Davoust  and
G. Fleury
M.-E. Davoust*
Affiliation:
Measurement Department, École Supérieure d'Électricité, Plateau du Moulon, 91192 Gif-sur-Yvette, France
G. Fleury
Affiliation:
Measurement Department, École Supérieure d'Électricité, Plateau du Moulon, 91192 Gif-sur-Yvette, France
*
[email protected]
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Abstract

The remote field eddy current technique is used fordimensioning the grooves that may occur in the ferromagnetic pipes. Wepropose a method to estimate the depth and the length of corrosiongrooves from measurement of a pick-up coil signal phase atdifferent positions close to the defect. Groove dimensioningrequiresthe knowledge of the physical relation between measurements anddefect dimensions; therefore finite-element calculations areperformed to design parametric algebraic functions for modeling thephysical phenomena. Different models are possible; the choiceof this algebraic function is discussed from identification criteria. By means of new measurement formalism and twopreviously defined measurement relations, estimates of groovesizes may be given. In the first approach, algebraic function parameters andgroove dimensions are linked through a polynomial function; this approach is proved to bebetter than a second one which tries to take advantage of more physical considerations.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 11 , Issue 3 , September 2000 , pp. 205 - 213
Copyright
© EDP Sciences, 2000

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Footnotes

*

This work has been presented at NUMELEC 2000.

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