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Eddy-current evaluation of 3-D defects in a metal plate: a first analysis of a contrast-source gradient method

Abstract : Retrieval of voluminous defects in a non-magnetic metal plate from maps of time-harmonic anomalous magnetic fields in air due to a source nearby is performed by a contrast-source, gradient-type technique which uses the binary aspect of the sought conductivity distributions. The functional analysis within a vector inte-gral formulation of the diffusive fields is sketched and the efficiency of the approach is discussed in the light of preliminary inversion results obtained with synthetic data.
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Daniel dos Reis, Marc Lambert, Dominique Lesselier. Eddy-current evaluation of 3-D defects in a metal plate: a first analysis of a contrast-source gradient method. F. Kojima; T. Takagi; S. S. Udpa; J. Pavo. Electromagnetic Non--Destructive Evaluation, 23, IOS Press, pp.52-59, 2002, Studies in Applied Electromagnetics and Mechanics, 978-1-58603-245-6. ⟨hal-01103880⟩

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