Concerning the derivation of exact solutions to inductive circuit problems for eddy current testing

Desjardins, Daniel; Krause, Thomas W.; Tetervak, A.; Clapham, L.

doi:10.1016/j.ndteint.2014.07.008

Cited by 18 publications

(26 citation statements)

References 13 publications

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“…A time-harmonic voltage is applied to the drive coil, which generates a time-varying magnetic field and induces ECs in the nearby conducting materials [9,10]. From Faraday's law, an electromotive force (emf) is developed in the drive and pickup coils from the changing magnetic flux arising from the drive coil source current [9,10].…”

Section: Theorymentioning

confidence: 99%

“…These ECs generate an opposing magnetic field that produces an additional emf in both coils as per Lenz's law [11]. A lossy self-inductance is generated by the coil coupling to the ECs it generates [9,10]. Similarly, a lossy-mutual inductance is generated when a coil couples to the ECs generated by a neighbouring coil [9,10].…”

Section: Theorymentioning

confidence: 99%

“…Similarly, a lossy-mutual inductance is generated when a coil couples to the ECs generated by a neighbouring coil [9,10]. These lossy terms are complex-valued, frequency-dependent coefficients, which may be obtained by solving the boundary conditions imposed by the conductive structure [9,10]. As shown in Fig.…”

Section: Theorymentioning

confidence: 99%

“…The motivation for this paper was to compare Dodd and Deed's [4,5,6,7] model with the recently published general model of Desjardins et al [9,10] for a transmit-receive eddy current probe above a dual-layered plate structure with finite coil impedances and a voltage control excitation. The model of Desjardins et al [9,10] is valid for voltage control and pickup coils with finite impedances.…”

Section: Introductionmentioning

confidence: 99%

“…The model of Desjardins et al [9,10] is valid for voltage control and pickup coils with finite impedances. In addition Desjardins et al's model [9,10] is also applicable for modeling pulsed excitations, where the feedback on the excitation coil becomes significant (this is especially true for ferromagnetic conducting materials [9,10]). …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Examination of Dodd and Deeds solutions for a transmit-receive eddy current probe above a layered planar structure

Luloff¹,

Morelli²,

Krause³

2017

AIP Conference Proceedings

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Abstract. Exact solutions for the electromagnetic response of a transmit-receive coil pair situated above two parallel plates separated by a gap, were developed using the recently published general model of Desjardins et al. that accounts for all electromagnetic interactions between the voltage-driven probe and the conducting samples. This model was then compared to the well-known model developed by Dodd and Deeds, which assumes a constant amplitude sinusoidal current and an open-circuit pick-up coil. Both models were compared with experimental results that measured the gap -materials simulated the electromagnetic properties of a Zr 2.5% Nb pressure tube and Zr-2 calandria tube, respectively, as found in the fuel channels of CANDU ® reactors. It was observed that while the Dodd and Deeds' model as applied to this work achieved a good shape agreement with experimental data for excitation frequencies at 2 kHz, at the higher frequency of 16 kHz good agreement was not achieved. In contrast, the model of Desjardin's et al., adapted for a transmitreceive probe configuration above two infinite flat plates, achieved an excellent shape agreement at both frequencies.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Examination of Dodd and Deeds solutions for a transmit-receive eddy current probe above a layered planar structure

Luloff¹,

Morelli²,

Krause³

2017

AIP Conference Proceedings

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Novel Phase Reversal Feature for Inspection of Cracks Using Multi-frequency Alternating Current Field Measurement Technique

Yuan,

Li,

Zhao

et al. 2024

Recent Development of Alternating Current Field Measurement Combine With New Technology

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Aluminum and its alloys have been widely used in aerospace and other industrial fields. Aluminum and its alloy structures are prone to surface and subsurface cracks when they are used in harsh environments. In this paper, a novel phase reversal feature is found to classify and evaluate cracks using the multi-frequency alternating current field measurement (ACFM) technique. The theoretical model of the phase reversal feature is developed. The distorted electromagnetic field and response signals of surface and subsurface cracks are analyzed by the finite element method. The multi-frequency ACFM testing system is set up. The experiments are carried out to test surface and subsurface cracks. The results show that the response signals of the surface and subsurface cracks have distinct characteristic due to the phase reversal feature using the multi-frequency ACFM technique. The surface and subsurface cracks can be classified by the amplitude reversal phenomenon of the Bz signal caused by the novel phase reversal feature. The buried depth of the subsurface crack can be evaluated accurately by the reversal frequency component.

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Design and optimisation of mutual inductance based pulsed eddy current probe

et al. 2019

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Concerning the derivation of exact solutions to inductive circuit problems for eddy current testing

Cited by 18 publications

References 13 publications

Examination of Dodd and Deeds solutions for a transmit-receive eddy current probe above a layered planar structure

Examination of Dodd and Deeds solutions for a transmit-receive eddy current probe above a layered planar structure

Novel Phase Reversal Feature for Inspection of Cracks Using Multi-frequency Alternating Current Field Measurement Technique

Design and optimisation of mutual inductance based pulsed eddy current probe

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