Transient eddy current oscillations method for the inspection of thickness change in stainless steel

Angani, C. S.; Ramos, Helena G.; Ribeiro, A. Lopes; Rocha, Tiago; Prashanth, B. U. V.

doi:10.1016/j.sna.2015.07.003

Cited by 21 publications

(5 citation statements)

References 13 publications

(16 reference statements)

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“…The change of (U LC ) is amplified and related to the samples' surface resistivity (R ). Further variations in the eddy current measurements are described in [130,131,135,[137][138][139][140][141].…”

Section: Eddy Current Measurement: Methodsmentioning

confidence: 99%

“…The maximum sensitivity reached was 2 mV/nm. The importance of sensitivity was also emphasized by Angani, Ramos [141]. Moulder, Uzal [140] determined the effect of the coil size to specimen thickness ratio on the sensitivity of the instrument.…”

Section: Eddy Current Measurement: Practical Aspects and Analysesmentioning

confidence: 99%

“…Concerning the differentiation of materials, Hillmann, Klein [135] emphasized the importance of choosing the right frequency, in order to properly distinguish between different materials with different conductivities and thicknesses. Angani, Ramos [141] proposed using this method to evaluate the corrosion of metals.…”

Section: Eddy Current Measurement: Practical Aspects and Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Thickness Measurement Methods for Physical Vapor Deposited Aluminum Coatings in Packaging Applications: A Review

Lindner

Schmid

2017

Coatings

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Abstract:The production of barrier packaging materials, e.g., for food, by physical vapor deposition (PVD) of inorganic coatings such as aluminum on polymer substrates is an established and well understood functionalization technique today. In order to achieve a sufficient barrier against gases, a coating thickness of approximately 40 nm aluminum is necessary. This review provides a holistic overview of relevant methods commonly used in the packaging industry as well as in packaging research for determining the aluminum coating thickness. The theoretical background, explanation of methods, analysis and effects on measured values, limitations, and resolutions are provided. In industrial applications, quartz micro balances (QCM) and optical density (OD) are commonly used for monitoring thickness homogeneity. Additionally, AFM (atomic force microscopy), electrical conductivity, eddy current measurement, interference, and mass spectrometry (ICP-MS) are presented as more packaging research related methods. This work aims to be used as a guiding handbook regarding the thickness measurement of aluminum coatings for packaging technologists working in the field of metallization.

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Section: Eddy Current Measurement: Methodsmentioning

confidence: 99%

Section: Eddy Current Measurement: Practical Aspects and Analysesmentioning

confidence: 99%

Section: Eddy Current Measurement: Practical Aspects and Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Thickness Measurement Methods for Physical Vapor Deposited Aluminum Coatings in Packaging Applications: A Review

Lindner

Schmid

2017

Coatings

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show abstract

“…A Giant Magneto-Resistive (GMR) sensor-based probe is also used for evaluation of material thickness [64,65]. Transient Eddy Current Oscillations (TECO) technique is introduced to estimate the thickness of stainless-steel material by identifying three features including zero crossing, envelope and energy in the magnetic field signal [66]. The distance between object/specimen and testing coil is referred to as lift-off.…”

Section: Pulsed Eddy Currentmentioning

confidence: 99%

Review on condition monitoring techniques for water pipelines

Latif

Shakir

Edwards³

et al. 2022

Measurement

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“…В той же час імпульсний ВСНК з ВСП в режимі коливальних затухаючих коливань практично не досліджувався. Відомі тільки нечисленні роботи, в яких проводився аналіз такого режиму стосовно визначення варіацій товщини листів із нержавіючої сталі [11,12].…”

Section: вступunclassified

Research of oscillation mode in automated pulsed eddy current testing systems

Lysenko¹,

Kuts²,

Uchanin³

et al. 2021

Otbor i peredača informacii

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The formation and analysis of eddy current probe signals obtained in pulsed excitation mode is considered. The proposed method of implementing pulsed eddy current testing with the formation of attenuating harmonic oscillations is more resistant to the effects of noise and interference that accompany the process of inspected object parameters evaluation. The equivalent scheme of the system “test object–eddy current probe” is developed and analyzed. The obtained mathematical model of the eddy current probe signals allowed proposing the natural frequency and the attenuation as informative signals parameters, which are determined from signals phase and amplitude characteristics. Developed algorithm and the proposed methodology was implemented for evaluation of eddy current signals parameters and related characteristics of testing objects. This method was experimentally verified on a series of different test specimens. The obtained results confirm the possibility to apply the proposed informative signals to solve some problems concerned with automated eddy current testing. The formation and analysis of eddy current probe signals obtained in pulsed excitation mode are considered. The proposed method of implementing pulsed eddy current testing with the formation of attenuating harmonic oscillations is more resistant to the effects of noise and interference that accompany the process of automated eddy current testing. The equivalent scheme of the system “test object–eddy current probe” is developed and analyzed. The obtained mathematical model of the eddy current probe signals allows proposing the natural frequency and the attenuation as informative signals parameters, which are determined from signal phase and amplitude characteristics. Methods of increasing the accuracy of determining the eddy current probe signals attenuation and frequency using trends of signals phase and amplitude characteristics are considered. The proposed signal processing method was verified by modeling the process of determining the eddy current probe signals attenuation and the frequency from the signal with Gaussian noise. Algorithmic and software were developed based on the simulation results and the proposed improved methodology was implemented for determining signals parameters and related parameters and characteristics of testing objects.

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Transient eddy current oscillations method for the inspection of thickness change in stainless steel

Cited by 21 publications

References 13 publications

Thickness Measurement Methods for Physical Vapor Deposited Aluminum Coatings in Packaging Applications: A Review

Thickness Measurement Methods for Physical Vapor Deposited Aluminum Coatings in Packaging Applications: A Review

Review on condition monitoring techniques for water pipelines

Research of oscillation mode in automated pulsed eddy current testing systems

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