EC probe with orthogonal excitation coils and TMR sensor for CFRP inspection

Ye, Chaofeng; Rosell, Anders; Haq, Mahmoodul; Stitt, Erik; Удпа, Лалита; Удпа, Сатиш С.

doi:10.3233/jae-171193

Cited by 16 publications

(12 citation statements)

References 5 publications

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“…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%

“…Thus, a compensation method was required to form a circularly rotating field. 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.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang

Deng

2020

Sensors

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“…A one-direction butterfly probe proposed in a previous study [21] was modified into a rotating butterfly probe.…”

Section: Rotating Butterfly Probe Designmentioning

confidence: 99%

“…The probe can work at frequencies below 1 kHz, and thereby, can detect deeper flaws from the surface of the test piece [18][19][20]. A similar type, using a tunnel magnetoresistance sensor, with a rotating UEC orientation, was able to detect flaws in carbon fiber reinforced polymers with variation in orientation and length of the flaws [21].…”

Section: Introductionmentioning

confidence: 99%

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

Repelianto

Kasai

Sekino³

et al. 2019

Metals

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The use of eddy currents for detecting flaws in specimens is of considerable significance in the industrial sector. In this study, a new design of a rotating uniform eddy current (UEC) probe, termed the rotating butterfly probe, is presented. The probe consists of two pairs of excitation coils arranged perpendicular to each other, positioned in two layers, and in a detection coil. The excitation and detection coils were installed the pancake orientation, which provides larger induction and enhances the sensitivity of flaws detection. In addition, to generate a rotating UEC distribution with same amplitude in all directions, the number of turns between first and second layers of the excitation coils and the amplitude of excitation current were arranged. Finite element simulations were conducted to confirm that rotating UEC distribution has the same amplitude in all directions. The experiment with the rotating butterfly probe was then conducted. In the experiment, the measured results with the probe was indicated the self-differential and self-nulling properties. Moreover, the probe was successful in detecting flaws in all directions on an aluminum plate. This attribute can be used for the effective inspection of test pieces.

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“…Ye et al designed an eddy current (EC) probe array with rotating exciting currents for the defect inspection. Besides, the numerical method plays an essential role to validate that the designed probe can detect defects in different layers [15][16].…”

Section: Introductionmentioning

confidence: 99%

Measuring Co-Axial Hole Size of Finite-Size Metallic Disk Based on a Dual-Constraint Integration Feature Using Multi-Frequency Eddy Current Testing

Huang¹,

Lü²,

He³

et al. 2020

Preprint

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This paper presents a new approach of eddy current methods for determining the size of the co-axial hole in the metallic circular disk. In recent decades, for the air-cored sensor probe, the impedance change due to the presence of an infinite metal plate can be calculated by the Dodd-Deeds model. However, in practical measurements, the sample cannot match with the condition required - ‘infinite’, thus the Dodd-Deeds model could not be applied to the disk with finite size and certainly not a co-axial hole in the center. In this paper, a dual-constraint analytical method is proposed. That is, the upper and lower limits of the integration are substituted with specific values instead of the original 0 and . Besides, it is found that, once the outer radius of the disk is fixed (i.e. the lower limit of integration is fixed), the upper limit reduces linearly as the size of the coaxial hole increases. Both the FEM simulation and experiments have been carried out to validate this method. The radius of the hole can be estimated based on the dual-constraint integration feature.

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EC probe with orthogonal excitation coils and TMR sensor for CFRP inspection

Cited by 16 publications

References 5 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

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

Measuring Co-Axial Hole Size of Finite-Size Metallic Disk Based on a Dual-Constraint Integration Feature Using Multi-Frequency Eddy Current Testing

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