Gradient-field pulsed eddy current probes for imaging of hidden corrosion in conductive structures

Li, Yong; Yan, Biao; Li, Da; Li, Yili; Zhou, Di

doi:10.1016/j.sna.2015.12.026

Cited by 40 publications

(24 citation statements)

References 19 publications

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“…Whilst most of sensing devices used are absolute, the use of gradient-field GMR sensors has also been reported by Li, et al [32]. Interestingly, they discover that the gradient-field measurements give better sensitivity and accuracy in detection and sizing artificial sub-surface corrosion in layered samples.…”

Section: Sensing Devicesmentioning

confidence: 87%

“…9 shows typical examples PEC signals obtained by using a Hall-device. The features that are used to infer the desired parameters may be readily available, such as peak value [32], [48], [49], peak arrival time [49], rising time [50] and zero crossing time [51]. In addition to these more traditional features, there have also been emerging features proposed in various reports, such as the so called ''relative variation of magnetic flux'' [20], which has been shown through both simulation and experiments to have potentials in determining the lift-off for ferromagnetic materials [7].…”

Section: Signal Feature and Feature Extractionmentioning

confidence: 99%

See 1 more Smart Citation

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

Sophian

Tian

Fan

2017

Chin. J. Mech. Eng.

180

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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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Section: Sensing Devicesmentioning

confidence: 87%

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.

180

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“…Unlike a conventional excitation coil, a driver trace was placed between the 4 × 4 arrays of pick up coils, for the purpose of current excitation. The work in PEC was also extended to the use of measurement of the gradient of the magnetic flux density using gradient-field PEC (GPEC) probe, which was claimed to offer higher sensitivity [6,7].…”

Section: Introductionmentioning

confidence: 99%

Image-Based Feature Extraction Technique for Inclined Crack Quantification Using Pulsed Eddy Current

Nafiah

Sophian

Khan

et al. 2019

Chin. J. Mech. Eng.

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Existing eddy current non-destructive testing (NDT) techniques generally do not consider the inclination angle of inclined cracks, which potentially harms a larger region of a tested structure. This work proposes the use of 2D scan images generated by using pulsed eddy current (PEC) non-destructive testing (NDT) technique in the quantification of the inclination and depth of inclined cracks. The image-based feature extraction technique effectively identifies the crack axis, which consequently enables extraction of features from the extracted linear scans. The technique extracts linear scans from the images to allow the extraction of three novel image-based features, namely the length of extracted linear scans (LLS), the linear scan skewness (LSS), and the highest value on linear scan (LS max). The correlation of the three features to surface crack inclination angles and depths were analysed and found to be highly dependent on the crack depths, while only LLS and LSS are correlated to the crack inclination angles.

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“…Eddy Current techniques such as Pulsed Eddy Current (PEC) [3,4,5], Gradient PEC [6] and Saturated Low Frequency Eddy Current (SLOFEC) [7,8] have been proposed for the inspection of inner and outer wall defects in difficult to inspect pipes via external application outside of cladding and insulation. PEC testing is slow, and can only detect generalised wall loss [9].…”

Section: Introductionmentioning

confidence: 99%

“…PEC testing is slow, and can only detect generalised wall loss [9]. Gradient-PEC offers greater sensitivity to hidden corrosion, but can overestimate corrosion size leading to false alarms [6]. SLOFEC requires a DC magnetic field to saturate the pipe so that induced eddy currents can penetrate to the inner surface of the material.…”

Section: Introductionmentioning

confidence: 99%