Bobbin coil signal variation due to an axisymmetric circumferential groove in a tube

dc.contributor.author Theodoulidis, Theodoros
dc.contributor.author Bowler, John
dc.contributor.department Center for Nondestructive Evaluation
dc.date 2018-02-13T06:14:36.000
dc.date.accessioned 2020-06-30T01:25:52Z
dc.date.available 2020-06-30T01:25:52Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.embargo 2013-02-13
dc.date.issued 2008-07-01
dc.description.abstract <p>We have developed a general method for finding new solutions in eddy current nondestructive evaluation by introducing truncation boundaries in configurations that are otherwise unbounded. Here we consider an application of the method to the case of a tube containing a co‐axial bobbin coil near a circumferential groove of rectangular cross section. The groove can be on the internal or external wall of the tube. The problem is axially symmetric and easily solved using numerical methods however, we seek an accurate semi‐analytical solution. Take the axis of the system to be perpendicular to two truncation planes with the groove bisected by a mid plane halfway between them. Boundary conditions are applied on the truncation planes where we suppose that the tangential electric field is zero. In order to ensure that the predicted field is close to that expected in the corresponding unbounded domain problem, the truncation planes are far apart, well away from the coil and the groove. The solution is expressed as series expansions for different regions that are matched across cylindrical boundaries using the continuity properties of the electromagnetic field. This process gives the expansion coefficients in the series in terms of the expansion coefficients that represent the field of the source coil. From the solutions, the coil signal due to the groove can be deduced. The accuracy of the calculation is easily controlled by adjusting the distance between the truncation planes and∕or the number of terms in the series expansions.</p>
dc.description.comments <p>Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.</p> <p>This article appeared in <em>AIP Conference Proceedings</em>, 1096 (2009): 1922–1929 and may be found at: <a href="http://link.aip.org/link/doi/10.1063/1.3114194">http://dx.doi.org/10.1063/1.3114194</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/cnde_conf/77/
dc.identifier.articleid 1094
dc.identifier.contextkey 3696200
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath cnde_conf/77
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/15699
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/cnde_conf/77/2008_Theodoulidis_BobbinCoilSignal.pdf|||Sat Jan 15 01:52:14 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Structures and Materials
dc.subject.keywords eddy currents
dc.subject.keywords nondestructive testing
dc.subject.keywords magnetostatics
dc.subject.keywords QNDE
dc.title Bobbin coil signal variation due to an axisymmetric circumferential groove in a tube
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication 8f84ecb5-0dfb-4ba9-b2c8-1309847c130a
relation.isOrgUnitOfPublication f2b877c3-5654-4c6a-9e64-6c944f9f02b6
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