Generalization of the Ideal Crack Model for an Arrayed Eddy Current Sensor

Zaoui, Abdelhalim; Menana, Hocine; Féliachi, Mouloud; Abdellah, Marwan

doi:10.1109/tmag.2007.914846

Cited by 15 publications

(12 citation statements)

References 8 publications

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“…Even if the coil is replaced by an arrayed system, the computation time of the incident field will not increase considerably. The rapid computation of the incident electric field is in great contrast to other approaches that unnecessarily utilize time consuming 3D-FEM approaches for such a simple geometry [12]. In addition, computation of the reflection part of the Green's function and the incident field is two orders of magnitude faster than computation with automatic integration routines for the relevant integral expressions.…”

Section: Results and Experimentsmentioning

confidence: 99%

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Rapid computation of eddy current signals from narrow cracks

Theodoulidis¹,

Poulakis²,

Dragogias³

2010

NDT & E International

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Section: Results and Experimentsmentioning

confidence: 99%

“…In addition, the case of an ideal crack in a finite depth plate was studied in [11] and the case of an arrayed eddy current sensor in [12]. In principle, the narrow crack problem could be modeled with the volume integral method [13].…”

Section: Article In Pressmentioning

confidence: 99%

Rapid computation of eddy current signals from narrow cracks

Theodoulidis¹,

Poulakis²,

Dragogias³

2010

NDT & E International

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“…Some extensions of this model for, e.g. the case of an arrayed eddy current sensor or the tilted ideal crack have been proposed by Zaoui et al (2008) and Beltrame and Burais (2004), respectively.…”

Section: Compel 313mentioning

confidence: 99%

Space mapping methodology for defect recognition in eddy current testing – type NDT

Putek

Crevecoeur

Slodička

et al. 2012

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to solve an inverse problem of structure recognition arising in eddy current testing (ECT) -type NDT. For this purpose, the space mapping (SM) technique with an extraction based on the Gauss-Newton algorithm with Tikhonov regularization is applied. Design/methodology/approach -The aim is to have a computationally fast recognition procedure of defects since the monitoring results in a large amount of data points that need to be analyzed by 3D eddy current model. According to the SM optimization, the finite element method (FEM) is used as a fine model, while the model based on an integral method such as the volume integral method (VIM) serves as a coarse model. This approach, being an example of a two-level optimization method, allows shifting the optimization load from a time consuming and accurate model to the less precise but faster coarse surrogate. Findings -The application of this method enables shortening of the evaluation time that is required to provide the proper parameter estimation of surface defects. Research limitations/implications -In this work only the specific kinds of surface defects were considered. Therefore, the reconstruction of arbitrary shapes of defects when using real measurement data from ECT system can be treated in further research. Originality/value -The paper investigated the eddy current inverse problem. According to aggressive space mapping method, a suitable coarse model is needed. In this case, for the purpose of 3D defect reconstruction, the reduced VIM approach was applied. From a practical view point, the authors demonstrated that the two-level inversion procedures allow saving of up to 50 percent CPU time in comparison with the optimization by means of regularized Gauss-Newton algorithm in the same FE model.

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“…These impedance changes are easily measurable. One of the main advantages of eddy current inspection is the speed at which tests can be done [7].…”

Section: Eddy Current Testingmentioning

confidence: 99%

“…A low-cost and simple operation, eddy current testing has been used broadly: for detecting defects and making material thickness measurements [9], for inspecting printed circuit boards [10], for assuring quality and inspecting cracks in conductive materials [7,[11][12][13] and for alloy sorting and monitoring of metallurgical conditions such as hardness and heat treatment in conductive objects [14][15][16].…”

Section: Eddy Current Testingmentioning

confidence: 99%

An eddy-current-based sensor for preventing knots in metallic wire drawing processes

Esteban¹,

Riba²,

Baquero³

et al. 2011

Nondestructive Testing and Evaluation

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During metallic wire drawing processes, the presence of knots and the failure to detect them can lead to long production interruptions, significant economic losses and a lower quality of final product. Consequently, there is a pressing need to develop methods for real-time detection and prevention of this fault.In this paper a sensor to prevent the formation of knots during the metallic wire drawing process is presented and evaluated by means of experimental data. This fast, inexpensive, non-contact sensor is based on electromagnetic principles such as eddy current induction, magnetic reluctance variations and magnetic coupling. The proposed sensor can detect knots in a target metallic wire without direct contact by measuring the impedance variations of a calibrated sensing coil caused either by a knot or an unwound loop rising from a wire rod. The incorporation of this type of sensor into a wire drawing machine can avoid the tightening of the knot, thereby reducing downtime and increasing the security and reliability of the process.Experiments were conducted using a scale model of the above proposed system. This allowed to highlight the sensor's potential by carrying out an automatic, real-time knot detection during steel wire drawing.

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Generalization of the Ideal Crack Model for an Arrayed Eddy Current Sensor

Cited by 15 publications

References 8 publications

Rapid computation of eddy current signals from narrow cracks

Rapid computation of eddy current signals from narrow cracks

Space mapping methodology for defect recognition in eddy current testing – type NDT

An eddy-current-based sensor for preventing knots in metallic wire drawing processes

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