2009
DOI: 10.1108/03321640910958964
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Characterization of a 3D defect using the expected improvement algorithm

Abstract: PurposeThe purpose of this paper is to provide a new methodology for the characterization of a defect by eddy‐current testing (ECT). The defect is embedded in a conductive non‐magnetic plate and the measured data are the impedance variation of an air‐cored probe coil scanning above the top of the plate.Design/methodology/approachThe inverse problem of defect characterization is solved by an iterative global optimization process. The strategy of the iterations is the kriging‐based expected improvement (EI) glob… Show more

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Cited by 12 publications
(11 citation statements)
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“…The defect is characterized by its length (L) and depth (D, given in % of plate thickness) leading to a 2-dimensional input parameter vector x. The surface scan of the probe coil is centered on the crack and contains q = 841 measurement points and the corresponding q ΔZ complex values (5) are stored in the output parameter vector y.…”
Section: Illustrative Ect Problemmentioning
confidence: 99%
See 1 more Smart Citation
“…The defect is characterized by its length (L) and depth (D, given in % of plate thickness) leading to a 2-dimensional input parameter vector x. The surface scan of the probe coil is centered on the crack and contains q = 841 measurement points and the corresponding q ΔZ complex values (5) are stored in the output parameter vector y.…”
Section: Illustrative Ect Problemmentioning
confidence: 99%
“…Some applications in electromagnetics are presented for instance in [4]. Also the authors have applied kriging to solve ECT inverse problems in [5]. However, the approach of [5] focuses on the kriging prediction of a cost-function (to be minimized in an optimization loop) -now the present paper deals with the use of kriging directly on the output signal.…”
Section: Introductionmentioning
confidence: 99%
“…However, to date, little research has been carried out in applying Kriging models to crack identification in plates. Bilicz et al [23] provides a methodology for the characterization of a 3D defect embedded in a conductive nonmagnetic plate from the measurement of the impedance variations of an aircored pancake coil at eddy current frequencies based on Kriging interpolation using the Expected Improvement algorithm. However, the boundary of the defect model must be parallel or perpendicular to the plate, which somewhat diminishes its utility.…”
Section: Introductionmentioning
confidence: 99%
“…By now, this method has been implemented in commercial softwares, e.g. CIVA (2007), and has been successfully applied in inversion algorithms as well (Bilicz et al, 2009). The volume integral method has recently been revisited in Reboud et al (2008), where the EM field is expanded by means of locally defined splines.…”
Section: Introductionmentioning
confidence: 99%