Flaw Detection in Aluminum Plates Using a Rotating Uniform Eddy Current Probe with Two Pairs of Excitation Coils

Repelianto, Ageng Sadnowo; Kasai, Naoya; Sekino, Kouichi; Matsunaga, Masaki; Trung, Le Quang

doi:10.3390/met9101069

Cited by 14 publications

(7 citation statements)

References 23 publications

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“…Due to the antisymmetric excitation, the directions of eddy current induced magnetic flux at two sides of the central region are opposite in polarities. When an induction coil is used as the detection sensor, the electromotive forces generated by magnetic flux of the two sides will cancel each other out, rendering a zero output even if the coil is above the defect center [25]. Furthermore, the coil's large footprint will lead to a low spatial resolution for the detection of a small defect.…”

Section: Dual-coil Focusing Schemementioning

confidence: 99%

“…To cope with the practical situation that the defect orientation is not known in advance or is unpredictable, two methods have been developed-rotationally scanning on the suspicious zone [19][20][21] and developing a rotating current excitation [22][23][24][25][26]. They have the same underlying physics for the sensing mechanism but the latter is superior to the former because it avoids the inevitable noise caused by mechanically rotating and is suitable for a C-scan or even a line scan.…”

Section: Introductionmentioning

confidence: 99%

“…This probe structure was then further developed by Ye et al [23,24], including GMR arrays to eliminate the impact of background field and applying TMR to replace GMR for increasing the spatial resolution. In a similar way, Repelianto et al [25] presented a rotating uniform eddy current probe with two pairs of orthogonally installed rectangular excitation coils and a small detection coil. Since the stacked excitation coils have quite different lift-off distances, they are well adjusted with different numbers of turns and excitation currents to make a rotating field.…”

Section: Introductionmentioning

confidence: 99%

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Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

Wang

Deng

2020

Sensors

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This paper presents a rotating focused field eddy-current (EC) sensing technique, which leverages the advantages of magnetic field focusing and rotating magnetic field, for arbitrary orientation defects detection. The sensor consists of four identical excitation coils orthogonally arranged in an upside-down pyramid configuration and a giant magneto-resistive (GMR) detection element. The four coils are connected to form two figure-8-shaped focusing sub-probes, which are fed by two identical harmonic currents with 90 degrees phase difference. A finite element model-based study of arbitrary orientation defects detection was performed to understand the probe operational characteristics and optimize its design parameters. Probe prototyping and experimental validation were also carried out on a carbon steel plate specimen with four prefabricated surface-breaking defects. In-situ spot inspection with the probe rotating above the defect and a manual line-scan inspection were both conducted. Results showed that the probe has the capability of detecting defects with any orientations while maintaining the same sensitivity and the defect depth can be quantitatively evaluated by using the signal amplitude. Compared with the existing rotating field probes, the presented probe does not require additional excitation adjustment or data fusion. Meanwhile, due to its focusing effect, it can generate a strong rotating magnetic field at the defect location with a weak background noise, thus yielding superior signal-to-noise ratio.

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Section: Dual-coil Focusing Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

Wang

Deng

2020

Sensors

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“…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. 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.…”

Section: Introductionmentioning

confidence: 99%

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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“…Additionally, this inspection gets complex due to the inherent noise generated by the mechanical rotation, requiring additional postprocessing for crack angle determination. The rotating current excitation method (Yang et al , 2014; Ye et al , 2015; Ye et al , 2019; Repelianto et al , 2019a; Wang et al , 2019; Ge et al , 2022; Koyama et al , 2011) uses, typically, two coils arranged in an orthogonal position and controlled by two current excitations with a phase difference of 90° to produce a rotating UEC and a rotating magnetic field on the workpiece. As a result, the probe maintains equal sensitivity to defects of arbitrary orientation.…”

Section: Introductionmentioning

confidence: 99%

New design of rotating eddy current probe for arbitrary orientation cracks detection

Barrarat,

Rayane,

Helifa

et al. 2023

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Purpose Detecting the orientation of cracks is a major challenge in the development of eddy current nondestructive testing probes. Eddy current-based techniques are limited in their ability to detect cracks that are not perpendicular to induced current flows. This study aims to investigate the application of the rotating electromagnetic field method to detect arbitrary orientation defects in conductive nonferrous parts. This method significantly improves the detection of cracks of any orientation. Design/methodology/approach A new rotating uniform eddy current (RUEC) probe is presented. Two exciting pairs consisting of similar square-shaped coils are arranged orthogonally at the same lifting point, thus avoiding further adjustment of the excitation system to generate a rotating electromagnetic field, eliminating any need for mechanical rotation and focusing this field with high density. A circular detection coil serving as a receiver is mounted in the middle of the excitation system. Findings A simulation model of the rotating electromagnetic field system is performed to determine the rules and characteristics of the electromagnetic signal distribution in the defect area. Referring to the experimental results aimed to detect artificial cracks at arbitrary angles in underwater structures using the rotating alternating current field measurement (RACFM) system in Li et al. (2016), the model proposed in this paper is validated. Originality/value CEDRAT FLUX 3D simulation results showed that the proposed probe can detect cracks with any orientation, maintaining the same sensitivity, which demonstrates its effectiveness. Furthermore, the proposed RUEC probe, associated with the exploitation procedure, allows us to provide a full characterization of the crack, namely, its length, depth and orientation in a one-pass scan, by analyzing the magnetic induction signal.

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Flaw Detection in Aluminum Plates Using a Rotating Uniform Eddy Current Probe with Two Pairs of Excitation Coils

Cited by 14 publications

References 23 publications

Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

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

New design of rotating eddy current probe for arbitrary orientation cracks detection

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