Eddy current convergence probes with self-differential and self-nulling characteristics for detecting cracks in conductive materials

Trung, Le Quang; Kasai, Naoya; Sekino, Kouichi; Miyazaki, Seishu

doi:10.1016/j.sna.2022.114084

Cited by 10 publications

(7 citation statements)

References 26 publications

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“…Furthermore, to pursue the spatial resolution, a flexible eddy current array probe has a large spatial resolution, which will be disadvantageous when examining test pieces with a small area, especially as it cannot detect adjacent cracks. Therefore, in our previous study, an eddy current convergence (ECC) probe with a copper core having slits, hollows, and a plate fitted under the excitation coil was considered to create an extremely strong EC converging at the tip of the copper core 35 , 36 . Nevertheless, for the ECC probe of the previous work, the crack signal amplitude was significantly reduced when the EC lines were parallel to the crack length as compared to perpendicular to the crack length, leading to significantly affected evaluation of the crack's characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this study presents a novel rotating uniform eddy current convergence (RUECC) probe using a sophisticated design of a copper core that can create rotating ECs converging at the tip of the copper core, resulting in the generation of an extremely strong rotating EC on the test piece surface to detect small cracks in all directions. By adjusting the size and number of turns of the excitation coil and the structure of the copper core to produce ECs that converge at the tip of the copper core, the RUECC probe can overcome the disadvantage of ECC probes in the previous studies 35 , 36 . The ability to detect small defects in all directions with the probe is expected to significantly improve too.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, we can adjust the excitation current magnitude as well as the frequency of the excitation coils to enhance the RUEC intensity generated in the test specimen, as reported in Ref. 36 .…”

Section: Introductionmentioning

confidence: 99%

“…A method to solve this problem is to use a pair of excitation cores with the same frequency and currents with a phase difference of 90° to generate a rotating EC on the surface of the specimen 18,19,23,37 . However, our previous study 35,36 was hindered in creating EC rotation on the surface of the test piece because this rotation was not directly generated by the excitation coils but by the ECs converging at the tip of the copper core. In other words, to create a uniform rotating EC across the surface of the test piece, the ECs that converge at the tip of the copper core capable of uniform rotation must be controlled.…”

mentioning

confidence: 98%

“…

www.nature.com/scientificreports/ (ECC) probe with a copper core having slits, hollows, and a plate fitted under the excitation coil was considered to create an extremely strong EC converging at the tip of the copper core 35,36 . Nevertheless, for the ECC probe of the previous work, the crack signal amplitude was significantly reduced when the EC lines were parallel to the crack length as compared to perpendicular to the crack length, leading to significantly affected evaluation of the crack's characteristics.

…”

mentioning

confidence: 99%

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A sophisticated design of copper core to converge rotating eddy current control for detecting cracks in conductive materials

Trung

Kasai

Sekino

et al. 2023

Sci Rep

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Eddy current (EC) testing has been selected as a standard candidate for detecting defects in conductive materials in the past few decades. Nevertheless, inventing EC probes capable of detecting minor defects has always been challenging for researchers due to the tradeoff between the probe dimensions and the strength of the EC generated on the surface of the test piece. Here, we use a copper core with a sophisticated design to converge the rotating EC at the tip of the copper core to detect small cracks in all directions in conductive materials. In this method, we can arbitrarily accommodate a large excitation coil so that a larger rotating uniform EC is generated in a small area of the test piece. Hence, the probe can detect cracks in all directions in conductive materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 98%

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mentioning

confidence: 99%

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A sophisticated design of copper core to converge rotating eddy current control for detecting cracks in conductive materials

Trung

Kasai

Sekino

et al. 2023

Sci Rep

Self Cite

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Detection and Classification of Surface Cracks Using Deep Learning Based Autoencoders in Eddy Current Testing

Fatima,

Bachir,

Samir

et al. 2024

IEEJ Transactions Elec Engng

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Industrial equipment subjected to rigorous conditions of high speed and pressure leads to the development of cracks on metal surfaces. These cracks reduce the service life and threaten the safety of parts, and the deeper the crack, the greater the resulting damage. Crack detection and crack depth evaluation continue to take center stage in quantitative non‐destructive testing and evaluation (NDT&E 4.0). The accuracy of the rotating uniform eddy current (RUEC) probe in achieving fast and efficient detection of surface cracks is corroborated by a comparison with previous experimental results. Next, accurate crack depth classification is achieved by building deep learning model based on a sparse autoencoder (SAE) and a multi‐layer perceptron (MLP) model. These classifiers are combined with eddy current testing (ECT) data, including the normal magnetic component Bz. As a result, evaluation metrics such as accuracy increased by up to 100% with both precision and recall scores of 1 for the deep sparse autoencoder classifier compared to MLP performance. The originality of our approach is evident in the application of deep SAE, which achieves high classification accuracy. Furthermore, the integration of our high‐resolution NDT&E RUEC probe with advanced machine learning models for depth classification is both novel and impactful. This unique combination offers a comprehensive framework for crack analysis, from precise detection to detailed characterization. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

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Non-destructive testing by eddy current sensor for crack orientation detection using HHO optimizer by differential probe

Harzallah,

Nabil

2024

Construction and Building Materials

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Eddy current convergence probes with self-differential and self-nulling characteristics for detecting cracks in conductive materials

Cited by 10 publications

References 26 publications

A sophisticated design of copper core to converge rotating eddy current control for detecting cracks in conductive materials

A sophisticated design of copper core to converge rotating eddy current control for detecting cracks in conductive materials

Detection and Classification of Surface Cracks Using Deep Learning Based Autoencoders in Eddy Current Testing

Non-destructive testing by eddy current sensor for crack orientation detection using HHO optimizer by differential probe

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