Pulsed eddy current imaging and frequency spectrum analysis for hidden defect nondestructive testing and evaluation

He, Yunze; Pan, Mengchun; Luo, Fei; Tian, Guohui

doi:10.1016/j.ndteint.2011.01.009

Cited by 112 publications

(47 citation statements)

References 32 publications

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“…The same problem has been posed for the use of conductive carbon fibres as reinforcement in CFRP, using pulsed eddy currents (Tian & Sophian 2006;He et al 2011), SQUID sensing (Hatsukade et al 2002) and different special electromagnetic sensors (Grimberg et al 2001;Sophian et al 2001;Grimberg 2011).…”

Section: Introductionmentioning

confidence: 99%

High-frequency electromagnetic non-destructive evaluation for high spatial resolution, using metamaterials

Grimberg

Tian

2012

Proc. R. Soc. A.

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This study presents a new high-frequency electromagnetic method for a non-destructive evaluation of metallic strip gratings from printed circuit boards and of some carbon-fibrereinforced plastic composites, allowing the detection of small defects. The electromagnetic transducer is based on a metamaterial lens realized with two conical Swiss rolls, that allows the transmission and intensification of purely evanescent modes generated in the slits of metallic strip gratings and in the dielectric that insulate the carbon fibres between them. The method and the transducer used allow the localization of metallic strip interruptions whose widths are greater than 0.2 mm, the non-alignment of carbon fibres, the breaking of carbon fibres, the lack of resin or delaminations due to impact at low energies, with spatial resolution being greater than 0.1 mm.

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Section: Introductionmentioning

confidence: 99%

High-frequency electromagnetic non-destructive evaluation for high spatial resolution, using metamaterials

Grimberg

Tian

2012

Proc. R. Soc. A.

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“…With directional probes, the paths of the induced eddy currents are not circular, and, therefore, they are more sensitive to changes in a particular direction. One example of the use of directional rectangular coil is the work done by He, et al [19], [20]. They also state that a more uniform eddy current distribution is being an advantage gained by using such a coil.…”

Section: Probesmentioning

confidence: 99%

“…For classification of surface and sub-surface defects, He, et al [19] used amplitudes of a few harmonics generated by using FFT. In another more recent work, for mapping artificial surface slots and holes, Abrantes, et al have also used FFT to get the amplitudes and phases of the fundamental and harmonics [16].…”

Section: Signal Feature and Feature Extractionmentioning

confidence: 99%

Pulsed Eddy Current Non-destructive Testing and Evaluation: A Review

Sophian

Tian

Fan

2017

Chin. J. Mech. Eng.

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199

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Pulsed eddy current (PEC) non-destructive testing and evaluation (NDT&E) has been around for some time and it is still attracting extensive attention from researchers around the globe, which can be witnessed through the reports reviewed in this paper. Thanks to its richness of spectral components, various applications of this technique have been proposed and reported in the literature covering both structural integrity inspection and material characterization in various industrial sectors. To support its development and for better understanding of the phenomena around the transient induced eddy currents, attempts for its modelling both analytically and numerically have been made by researchers around the world. This review is an attempt to capture the state-of-the-art development and applications of PEC, especially in the last 15 years and it is not intended to be exhaustive. Future challenges and opportunities for PEC NDT&E are also presented.

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“…However, PEC testing has become a subject of widespread interest in NDT because of advancements in technologies such as computerized data acquisition and digital signal processing. Furthermore, PEC has the ability to measure thickness, conductivity and in particular, it provides subsurface crack measurements, crack reconstruction, and depth estimation [9,10]. Because of the potential advantages of PEC, numerous investigations of this technique have been made, such as for the detection of wall thinning and corrosion in aircraft multilayer structures [11,12].…”

Section: Introductionmentioning

confidence: 99%

Detection of Deep Subsurface Cracks in Thick Stainless Steel Plate

Kishore¹,

Park²,

Jeong³

et al. 2015

Journal of Magnetics

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Unlike conventional Eddy Current Test (ECT), Pulsed Eddy Current (PEC) uses a multiple-frequency current pulse through the excitation coil. In the present study, the detection of subsurface cracks using a specially designed probe that allows the detection of a deeper crack with a relatively small current density has been attempted using the PEC technique. The tested sample is a piece of 304 stainless steel (SS304) with a thickness of 30mm. Small electrical discharge machining (EDM) notches were put in the test sample at different depths from the surface to simulate the subsurface cracks in a pipe. The designed PEC probe consists of an excitation coil and a Hall sensor and can detect a subsurface crack as narrow and shallow as 0.2 mm wide and 2 mm deep. The maximum distance between the probe and the defect is 28 mm. The peak amplitude of the detected pulse is used to evaluate the cracks under the sample surface. In time domain analysis, the greater the crack depth the greater the peak amplitude of the detected pulse. The experimental results indicated that the proposed system has the potential to detect the subsurface cracks in stainless steel plates.

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Pulsed eddy current imaging and frequency spectrum analysis for hidden defect nondestructive testing and evaluation

Cited by 112 publications

References 32 publications

High-frequency electromagnetic non-destructive evaluation for high spatial resolution, using metamaterials

High-frequency electromagnetic non-destructive evaluation for high spatial resolution, using metamaterials

Pulsed Eddy Current Non-destructive Testing and Evaluation: A Review

Detection of Deep Subsurface Cracks in Thick Stainless Steel Plate

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