Performance analysis of single-frequency near electrical resonance signal enhancement (SF-NERSE) defect detection

Hughes, Rhidian; Dixon, Steve

doi:10.1016/j.ndteint.2018.11.008

Cited by 16 publications

(3 citation statements)

References 10 publications

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“…In this paper, 2.0 MHz was selected as the nominal frequency to demonstrate characterisation -corresponding to a typical high-frequency industrial eddy-current probe. However, due to research interest in near-resonant frequency measurements [26,27,28,29,30,31], a broad frequency spectra (1-8 MHz) was simulated and experimentally recorded, and the characterisation accuracy at each single frequency within this range evaluated.…”

Section: Characterisation Frequencymentioning

confidence: 99%

Exploring high-frequency eddy-current testing for sub-aperture defect characterisation using parametric-manifold mapping

Hughes

Drinkwater

2021

NDT & E International

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Section: Characterisation Frequencymentioning

confidence: 99%

Exploring high-frequency eddy-current testing for sub-aperture defect characterisation using parametric-manifold mapping

Hughes

Drinkwater

2021

NDT & E International

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“…However, the study's applicability may be constrained by its focused examination of specific waviness angles and CFRP types. Expanding on ECT probe optimization, [22] investigates the Near Electrical Resonance Signal Enhancement (NERSE) phenomenon. This study reveals that operating an absolute EC probe near its electrical resonance, particularly in the 1 to 5 MHz frequency range, significantly amplifies defect signals in aerospace superalloy Titanium 6Al-4V.…”

Section: Introductionmentioning

confidence: 99%

Towards Real-Time Railroad Inspection Using Directional Eddy Current Probe

Mussatayev,

Alanesi

2024

Preprint

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In the field of railroad safety, effective detection of surface cracks is critical, necessitating reliable, high-speed non-destructive testing (NDT) methods. This study introduces a hybrid Eddy Current Testing (ECT) probe, specifically engineered for railroad inspection, to address the common issue of ’lift-off noise’ due to varying distances between the probe and test material. Unlike traditional ECT methods, this probe integrates transmit and differential receiver coils, aiming to enhance detection sensitivity and minimize lift-off impact. The study optimizes ECT probes employing different driver coils, emphasizing three main objectives: a) quantitatively evaluating each probe using signal- to-noise ratio (SNR) and outlining a real-time data processing algorithm based on SNR methodology; b) exploring the frequency range proximal to the electrical resonance of the receiver coil; c) examining sensitivity variations across varying lift-off distances. The experimental outcomes indicate that the newly designed probe with figure 8-shape driver coil significantly improves sensitivity in detecting surface cracks on railroads. It achieves an impressive SNR exceeding 100 for defects with minimal dimensions of 1 mm in width and depth. Simulation results closely align with experimental findings, validating the investigation of optimal operational frequency and lift-off distance for selected probe performance, determined to be 0.3 MHz and 0.5 mm, respectively. The realization of this project would lead to notable advancements in enhancing railroad safety by improving crack detection efficiency.

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“…It has been applied for crack quantification [3], detection of thickness, measurement of permeability, and conductivity of materials coating [4,9,10] and object detection in more complex geometric areas [11]. However, the longer frequency sweep duration leads to lengthy inspection time scanning for defect positioning [12,13]. The pulsed ECT [5] has the potential for a shorter testing time with information of different depths due to its wide frequency bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Wireless power transfer-based eddy current non-destructive testing using a flexible printed coil array

Daura

Tian

et al. 2020

Phil. Trans. R. Soc. A.

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Eddy current testing (ECT) has been employed as a traditional non-destructive testing and evaluation (NDT&E) tool for many years. It has developed from single frequency to multiple frequencies, and eventually to pulsed and swept-frequency excitation. Recent progression of wireless power transfer (WPT) and flexible printed devices open opportunities to address challenges of defect detection and reconstruction under complex geometric situations. In this paper, a transmitter–receiver (Tx–Rx) flexible printed coil (FPC) array that uses the WPT approach featuring dual resonance responses for the first time has been proposed. The dual resonance responses can provide multiple parameters of samples, such as defect characteristics, lift-offs and material properties, while the flexible coil array allows area mapping of complex structures. To validate the proposed approach, experimental investigations of a single excitation coil with multiple receiving coils using the WPT principle were conducted on a curved pipe surface with a natural dent defect. The FPC array has one single excitation coil and 16 receiving (Rx) coils, which are used to measure the dent by using 21 C-scan points on the dedicated dent sample. The experimental data were then used for training and evaluation of dual resonance responses in terms of multiple feature extraction, selection and fusion for quantitative NDE. Four features, which include resonant magnitudes and principal components of the two resonant areas, were investigated for mapping and reconstructing the defective dent through correlation analysis for feature selection and feature fusion by deep learning. It shows that deep learning-based multiple feature fusion has outstanding performance for 3D defect reconstruction of WPT-based FPC-ECT. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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Performance analysis of single-frequency near electrical resonance signal enhancement (SF-NERSE) defect detection

Cited by 16 publications

References 10 publications

Exploring high-frequency eddy-current testing for sub-aperture defect characterisation using parametric-manifold mapping

Exploring high-frequency eddy-current testing for sub-aperture defect characterisation using parametric-manifold mapping

Towards Real-Time Railroad Inspection Using Directional Eddy Current Probe

Wireless power transfer-based eddy current non-destructive testing using a flexible printed coil array

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