Inversion of Eddy Current Signals in a Nonuniform Probe Field

dc.contributor.author Muennemann, F.
dc.contributor.author Auld, B.
dc.contributor.author Fortunko, C.
dc.contributor.author Padget, S.
dc.date 2018-02-14T02:31:23.000
dc.date.accessioned 2020-06-30T06:29:05Z
dc.date.available 2020-06-30T06:29:05Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 1983
dc.date.issued 1983
dc.description.abstract <p>We present a simple analytical method for predicting the eddy current signal (ΔZ) produced by a surface flaw of known dimensions, when interrogated by a probe with spatially varying magnetic field. The model is easily parameterized, and we use it to construct inversion schemes which can extract overall flaw dimensions from multiposition, multifrequency measurements. Our method is a type of Born approximation, in which we assume that the probe’s magnetic field at the mouth of the flaw can be used as a boundary condition on the electromagnetic field solutions inside the flaw. To simplify the calculation we have chosen a “rectangular” 3-dimensional flaw geometry for our model. We describe experimental measurements made with a new broadband probe on a variety of flaws. This probe operates in a frequency range of 200 kHz to 20 MHz and was designed to make the multifrequency measurements necessary for inversion purposes. Since inversion requires knowledge of the probe’s magnetic field shape, we describe experimental methods which determine the interrogating field geometry for any eddy current probe.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/qnde/1983/allcontent/101/
dc.identifier.articleid 1100
dc.identifier.contextkey 5767205
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/1983/allcontent/101
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/58515
dc.language.iso en
dc.relation.ispartofseries Review of Progress in Quantitative Nondestructive Evaluation
dc.source.bitstream archive/lib.dr.iastate.edu/qnde/1983/allcontent/101/1983_Muennemann_InversionEddy.pdf|||Fri Jan 14 18:13:27 UTC 2022
dc.source.uri 10.1007/978-1-4613-3706-5_101
dc.subject.disciplines Electromagnetics and Photonics
dc.title Inversion of Eddy Current Signals in a Nonuniform Probe Field
dc.type event
dc.type.genre article
dspace.entity.type Publication
relation.isSeriesOfPublication 289a28b5-887e-4ddb-8c51-a88d07ebc3f3
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