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On-line rail defect diagnosis with differential eddy current probes and specificdetection processing*

Published online by Cambridge University Press:  15 September 2003

M. Bentoumi ,
P. Aknin  and
G. Bloch
M. Bentoumi
Affiliation:
INRETS, 2 avenue Malleret-Joinville, 94114 Arcueil Cedex, France CRAN (UMR CNRS 7039), ESSTIN, rue Jean Lamour, 54519 Vandœuvre-les-Nancy Cedex, France
P. Aknin*
Affiliation:
INRETS, 2 avenue Malleret-Joinville, 94114 Arcueil Cedex, France
G. Bloch
Affiliation:
CRAN (UMR CNRS 7039), ESSTIN, rue Jean Lamour, 54519 Vandœuvre-les-Nancy Cedex, France
*
aknin@inrets.fr
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Abstract

This paper presents a non destructive evaluation system for rail inspection with a device embedded in a subway train. The difficult operating conditions lead to the design of a specific double-coils and double-frequencies sensor that delivers 8 complementary signals. After the presentation of the technological solution, the paper deals with the detection of minor defects and presents three approaches: the first one is a time heuristic approach, the second one is based on wavelet basis projections, and the last one implements an inverse filtering which allows the transformation of the differential probe outputs into estimated absolute ones. The methods are validated statistically on a labeled defect data set with the help of ROC curves.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 23 , Issue 3 , September 2003 , pp. 227 - 233
Copyright
© EDP Sciences, 2003

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Footnotes

*

This paper has been first presented orally at the C2I colloquium in February 2001

References

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