Multi-modal defect detection of residual oxide scale on a cold stainless steel strip

Martín, David; García-Alegre, María C.; Villanueva, Eliseo P.; Guinea, Domingo

doi:10.1007/s00138-010-0260-5

Cited by 26 publications

(17 citation statements)

References 20 publications

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“…In force of these considerations, the actual research on ECT is considering excitation signals containing wideband spectrums instead of the sinusoidal ones. To this aim some emerging techniques based on the use of multi-frequency, pulsed, chirp, and pseudo-noise signals, to cite a few, are proposed in literature as alternatives to traditional ECT signals in order to, primarily, improve the sensitivity of defect detection in some particular application field, and especially for small cracks, embedded deep in layered components [2][3][4][5][6][7][8][9][10][11][12][13]. Each one of these considered excitation signals present advantages and disadvantages that prevent the election of an absolute best excitation signal.…”

Section: Abstract Eddy Current Testing (Ect) Is a Nonmentioning

confidence: 99%

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An experimental comparison of complex excitation sequences for eddy current testing

et al. 2015

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Eddy Current Testing (ECT) is a Non Destructive technique widely used in many industrial application fields in which it is very important to detect the presence of thin defects (generally called cracks) in conductive materials. Features of this technique are the cost-effective implementation and the kind of retrieved measured data that make possible to estimate the geometrical characteristics of a crack as position, length, width and depth. The analysis of these characteristics allows the user to accept or discard realized components then improving the production chain. To accomplish for this task some aspects have to be taken into account during the measurement process. They mainly concern the realization of suitable measurement setup and post processing stages. As far as the measurement setup is concerned, crucial aspects are the choice of measurement and excitation devices. The choice of optimized excitation devices and strategies is of interest for research on Non Destructive ECT (ND-ECT): together with common aspects as the amplitude and the frequency of the exciting signal, the attention has been paid to issues as the type of signal to be adopted. In particular it has been found as the use of complex excitation signals, meant as signals different from the sinusoidal ones and with wide frequency content, might raise eddy current responses trying to support the measurement, detection and characterization stages when "difficult cases" are explored (i.e. very small and/or annealed cracks). In this paper the authors propose an experimental comparison of different excitation signals designed to improve the quality of experimental data when difficult cases are experienced and, consequently, to obtain a more reliable extraction of defects geometrical features.

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Section: Abstract Eddy Current Testing (Ect) Is a Nonmentioning

confidence: 99%

“…For each frequency α {f ,αÎ [1,10]} a 2D image that visualizes for each point {(x,y):xÎ [1,41],yÎ [1,31]} the amplitude of the "normalized" transfer function ˆα α α…”

Section: Post Processing For the Multi-frequency Signalsmentioning

confidence: 99%

An experimental comparison of complex excitation sequences for eddy current testing

et al. 2015

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“…[1][2][3][4] These methods are especially effective for surface defect images with local intensity variations. Since surface properties of the raw steel affect the quality of the final products, various automatic methods for detecting surface defects have been developed recently.…”

Section: Introductionmentioning

confidence: 99%

Development of an inspection system for planar steel surface using multispectral photometric stereo

2013

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We address the methodology and hardware design for detecting defects on a steel surface. The goal of this work is to develop a surface inspection system for defects with three-dimensional (3-D) characteristics on planar steel surface using multispectral photometric stereo technique. First, the reflections of multispectral illuminations from a steel surface are captured by a multi-channel camera system. Then, a 3-D reconstructed surface profile is extracted from estimated gradient fields. The developed system is applied to real steel specimens and the experimental results show that it can reliably detect tiny defects on the surface. © 2013 Society of Photo-Optical Instrumentation Engineers (SPIE) Fig. 3 Side view of the reconstructed surfaces using various algorithms: (a) top view of the surface defect, (b) the presented method, (c) Frankot-Chellappa, 14 (d) shapelet, 15 (e) affine transformation, 16 and (f) least-squares. 17 Optical Engineering 039701-3 March 2013/Vol. 52(3) Kang, Jang, and Won: Development of an inspection system for planar steel surface. . . Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/16/2015 Terms of Use: http://spiedl.org/terms Fig. 7 Reconstruction result of the steel surface. Optical Engineering 039701-6 March 2013/Vol. 52(3) Kang, Jang, and Won: Development of an inspection system for planar steel surface. . . Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/16/2015 Terms of Use: http://spiedl.org/terms

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“…The detection of defects is tackled with visual inspection systems based on standard cameras, lighting, and optical components, but they are developed to operate only in highly structured environments (Batchelor & Whelan, 1997; Pham & Alcock, 2003; Cognex, 2010; Parsytec, 2010). In the industries related to laminated materials, the machine vision wizards assist to manually select the surface inspection type and to create the image processing applications (NeuroCheck, 2010), and most only use visual systems to inspect both rough and bright laminated material surfaces (Guinea et al ., 2000; Montúfar‐Chaveznava et al ., 2001; Preciado et al . 2001; Spínola et al ., 2008; Martin et al ., 2010).…”

Section: Introductionmentioning

confidence: 99%

ARDIS: knowledge‐based architecture for visual system configuration in dynamic surface inspection

et al. 2011

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This work presents an approach to dynamic surface inspection in laminated materials based on the configuration of a visual system to obtain good quality control of the manufacturing surface. It aims to overcome some of the limitations of the single-use visual inspection systems by integrating and differentiating knowledge. The configuration task for surface inspection is solved as a Configuration-Design task according with the CommonKADS methodology. This task is analysed at the knowledge level and is decomposed into simple subtasks to reach the inference level. The generic domain knowledge involved in the configuration and revision tasks is differentiated in six types: initial, global, environment, real-time, image quality and computer vision techniques. The main goal of the proposed architecture is to reuse this partitioned knowledge for the configuration and revision of different visual surface inspection systems. The architecture has been implemented in a platform that distinguishes several operation modes: visualization of specific surface inspection results, system configuration and knowledge injection. Results obtained in the configuration and revision tasks for two surface inspection systems, stainless-steel and wood, are presented.

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Multi-modal defect detection of residual oxide scale on a cold stainless steel strip

Cited by 26 publications

References 20 publications

An experimental comparison of complex excitation sequences for eddy current testing

An experimental comparison of complex excitation sequences for eddy current testing

Development of an inspection system for planar steel surface using multispectral photometric stereo

ARDIS: knowledge‐based architecture for visual system configuration in dynamic surface inspection

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