2D Eddy current sensor array

Grimberg, Raimond; Удпа, Лалита; Savin, Adriana; Steigmann, Rozina; Palihovici, Valerian; Удпа, Сатиш С.

doi:10.1016/j.ndteint.2005.08.004

Cited by 59 publications

(29 citation statements)

References 6 publications

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“…Eddy current measurement consists in placing a conductive sample in a variable magnetic field. It is then traversed by induced currents, called "eddy currents" [7]. Measurements of the electrical resistivity were made using the four-point method.…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic Properties in Nanostructured Alloy Cu₇₀Co₃₀Obtained by a Non-Equilibrium Method

Laslouni

Azzaz

2016

Acta Phys. Pol. A

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The Cu70Co30 alloy was developed by a non-equilibrium method of "mechanical alloying", from a mixture of copper powder and pure cobalt. The nanostructured alloy Cu-Co with grains with a size of about 12 nm, has different electromagnetic properties which are often superior to those of conventional solid alloy, because of the critical size effect. In this work we are interested in the electromagnetic properties of the synthesized material. Resistivity, eddy current and the magnetization evolution were studied. The frequencies selected for plotting the diagram vary from 100 Hz to 100 kHz. To satisfy the Weiss condition, the excitation field must be of the same order of magnitude as the field that characterizes the area of Weiss. For all prepared series, the evolution of the magnetization as a function of milling time was analyzed. The influence of milling time on the resistivity variation is shown.

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Section: Methodsmentioning

confidence: 99%

Electromagnetic Properties in Nanostructured Alloy Cu₇₀Co₃₀Obtained by a Non-Equilibrium Method

Laslouni

Azzaz

2016

Acta Phys. Pol. A

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“…The geometry was tested based on simulation using Dyadic Green function and volume integral method described in [19,20]. The functioning of 2D sensor array [21] assures good lateral resolution and emphasizes hidden defects by simultaneous interrogation of the reception coils by means a multiplexor, improving the scan time and the response resolution. An internal multiplexing system reduces the mutual inductance and programs the actual time when each coil is interrogated.…”

Section: Sensor Conceptmentioning

confidence: 99%

“…The 2D array allows parallel acquisition of the signals, reducing the data storage and processing requirements. The signals are reconstructed into separate electromagnetic images and can be improved using super-resolution (SR) procedures [21,22]. SR is a technique in terms of its ability to resolve closely spaced scatters in a solid, measuring the near field of scattered waves.…”

Section: Sensor Conceptmentioning

confidence: 99%

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Electromagnetic configurable architectures for assessment of Carbon Fiber Reinforced Plastics

et al. 2017

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Abstract. Carbon Fiber Reinforced Plastics are used in most wide domains due their low density, lack of mechanical fatigue phenomena and high strength -to weight ratio. From electromagnetic point of view, Carbon Fiber Reinforced Plastics structure represents an inhomogeneous structure of electric conductive fibers embedded into a dielectric material, thus an electromagnetic configurable architecture can be used to evaluate above mentioned defects. The paper proposes a special sensor, send receiver type and the obtaining of electromagnetic image by post-processing each coil signals in each point of scanning, using a sub-encoding image reconstruction algorithm and super-resolution procedures. The layout of fibers can be detected interrogating only diagonal reception coils.

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“…The conventional ECT which operates with a single frequency sinusoidal excitation has gained wide acceptance in the field of NDT [1]; yet, this technique suffers from a limitation, i.e., penetration depth or skin depth. The penetration depth δ depends on excitation frequency f [2]. In contrast to the traditional ECT, the PEC employs a non sinusoidal excitation, such as a pulse or square wave, instead of a single frequency sinusoidal excitation, because the Fourier transform of a pulse contains multiple frequency components [3,4], a rectangular pulse can provide the depth profile of a material under test [5,6].…”

Section: Introductionmentioning

confidence: 99%

Detection of Corrosion and Wall Thinning in Carbon Steel Pipe Covered With Insulation Using Pulsed Eddy Current

Park¹,

Kishore²,

Kim³

et al. 2016

Journal of Magnetics

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Non Destructive Testing (NDT) methods that are capable of detecting the wall thinning and defects through insulation and cladding sheets are necessary. In this study we developed a Pulsed Eddy Current (PEC) system to detect wall thinning of ferro magnetic steel pipes covered with 95 mm thick fiber glass thermal insulator and shielded with aluminum plate of thickness 0.4 mm. In order to confirm the thickness change due to wall thinning, two different sensors, a hall sensor and a search coil sensor were used as a detecting element. In both the cases, the experimental data indicates a considerable change in the detected pulse corresponding to the change in sample thickness. The thickness of the tube was made to change such as 2.5 mm, 5 mm and 8 mm from the inner surface to simulate wall thinning. Fast Fourier Transform (FFT) was calculated using window approach and the results were summarized which shows a clear identification of thickness change in the test specimen by comparing the magnitude spectra.

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2D Eddy current sensor array

Cited by 59 publications

References 6 publications

Electromagnetic Properties in Nanostructured Alloy Cu₇₀Co₃₀Obtained by a Non-Equilibrium Method

Electromagnetic Properties in Nanostructured Alloy Cu₇₀Co₃₀Obtained by a Non-Equilibrium Method

Electromagnetic configurable architectures for assessment of Carbon Fiber Reinforced Plastics

Detection of Corrosion and Wall Thinning in Carbon Steel Pipe Covered With Insulation Using Pulsed Eddy Current

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2D Eddy current sensor array

Cited by 59 publications

References 6 publications

Electromagnetic Properties in Nanostructured Alloy Cu70Co30Obtained by a Non-Equilibrium Method

Electromagnetic Properties in Nanostructured Alloy Cu70Co30Obtained by a Non-Equilibrium Method

Electromagnetic configurable architectures for assessment of Carbon Fiber Reinforced Plastics

Detection of Corrosion and Wall Thinning in Carbon Steel Pipe Covered With Insulation Using Pulsed Eddy Current

Contact Info

Product

Resources

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Electromagnetic Properties in Nanostructured Alloy Cu₇₀Co₃₀Obtained by a Non-Equilibrium Method

Electromagnetic Properties in Nanostructured Alloy Cu₇₀Co₃₀Obtained by a Non-Equilibrium Method