An experimental comparison of multi-frequency and chirp excitations for eddy current testing on thin defects

Betta, G.; Ferrigno, Luigi; Laracca, Marco; Burrascano, Pietro; Ricci, Marco; Silipigni, Giuseppe

doi:10.1016/j.measurement.2014.12.015

Cited by 58 publications

(22 citation statements)

References 40 publications

(60 reference statements)

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“…A SL1260 impedance analyzer working in a swept frequency mode was used to acquire the multifrequency data in this paper. However, multifrequency impedances can also be abstracted simultaneously using composite multisine waveform excitation as in [23] or [34], which may improve the acquisition speed and calculation burden.…”

Section: Discussionmentioning

confidence: 99%

Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data

Lü

Zhu

Yin

et al. 2018

IEEE Trans. Instrum. Meas.

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Lift-off variation causes errors in eddy current measurement of nonmagnetic plates as well as magnetic plates. For nonmagnetic plates, previous work has been carried out to address the issue. In this paper, we follow a similar strategy, but try to reduce the lift-off effect on another index-zerocrossing frequency for magnetic plates. This modified index, termed as the compensated zero-crossing frequency, can be obtained from the measured multifrequency inductance spectral data using the algorithm we developed in this paper. Since the zero-crossing frequency can be compensated, the permeability of magnetic plates can finally be predicted by deriving the relation between the permeability and zero-crossing frequency from Dodd and Deeds method. We have derived the method through mathematical manipulation and verified it by both simulation and experimental data. The permeability error caused by liftoff can be reduced within 7.5%.

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Section: Discussionmentioning

confidence: 99%

Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data

Lü

Zhu

Yin

et al. 2018

IEEE Trans. Instrum. Meas.

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“…In order to estimate the depth of defects, GMR-multifrequency approach can be used [8] and for improving signal-to-noise ratio (SNR), a chirp application can be helpful [9]. Another excitation method is the so-called pulsed eddy current method (PEC) which is widely used in conventional ET.…”

Section: Eddy Current Testingmentioning

confidence: 99%

Benefits of GMR sensors for high spatial resolution NDT applications

Pelkner¹,

Stegemann²,

Sonntag³

et al. 2018

AIP Conference Proceedings

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“…Multi-frequency EC testing [8] was proposed to detect defects in different depths, and pulse current exciting current [9] was proposed to enrich the frequency component. Chirp excitation [10], whose frequency changes with time, was used for frequency sweep. In short, the innovations in exciting current waveforms only improved the eddy current distribution over time at a certain position.…”

Section: Introductionmentioning

confidence: 99%

Angular Spectral Density and Information Entropy for Eddy Current Distribution

Chen

Zhang

2016

Entropy

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Here, a new method is proposed to quantitatively evaluate the eddy current distribution induced by different exciting coils of an eddy current probe. Probability of energy allocation of a vector field is modeled via conservation of energy and imitating the wave function in quantum mechanics. The idea of quantization and the principle of circuit sampling is utilized to discretize the space of the vector field. Then, a method to calculate angular spectral density and Shannon information entropy is proposed. Eddy current induced by three different exciting coils is evaluated with this method, and the specific nature of eddy current testing is discussed.

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An experimental comparison of multi-frequency and chirp excitations for eddy current testing on thin defects

Cited by 58 publications

References 40 publications

Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data

Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data

Benefits of GMR sensors for high spatial resolution NDT applications

Angular Spectral Density and Information Entropy for Eddy Current Distribution

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