Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel

The periodic permanent magnet electromagnetic acoustic transducer (PPM EMAT) is a sensor that can generate and receive shear horizontal (SH) waves without direct contact with the inspected medium using the Lorentz mechanism. However, the PPM EMAT experiences high signal variance on ferromagnetic ste...

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Autores principales:	Cong Zhu Sun, Anthony Sinclair, Tobin Filleter
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	electromagnetic acoustic transducer periodic permanent magnet magnetostriction Lorentz shear horizontal wave steel Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/b1a0f3041af344738fe2aa12c9af1ba2
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spelling	oai:doaj.org-article:b1a0f3041af344738fe2aa12c9af1ba22021-11-25T18:58:33ZInfluence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel10.3390/s212277001424-8220https://doaj.org/article/b1a0f3041af344738fe2aa12c9af1ba22021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/22/7700https://doaj.org/toc/1424-8220The periodic permanent magnet electromagnetic acoustic transducer (PPM EMAT) is a sensor that can generate and receive shear horizontal (SH) waves without direct contact with the inspected medium using the Lorentz mechanism. However, the PPM EMAT experiences high signal variance on ferromagnetic steel under specific conditions, such as a change in signal amplitude when the sensor is moved in the direction of SH wave propagation. Magnetostriction effects are hypothesized to be the cause of these anomalous behaviors; the objective of this paper is to determine the relative strengths of the magnetostriction and Lorentz wave generation mechanisms for this type of EMAT on steel. This goal is accomplished through the use of a second EMAT, which induces only magnetostriction (MS-EMAT), to calibrate a novel semi-empirical magnetostriction model. It is found that magnetostriction effects reduce the amplitude of the SH wave generated by this particular PPM EMAT transmitter by an average of 29% over a range of input currents. It is also determined that magnetostriction is significant only in the investigated PPM EMAT transmitter, not the receiver. In terms of practical application, it is shown that the MS-EMAT is less sensitive to changes in the static and dynamic fields than PPM EMATs at specific operating points; this makes the MS-EMAT a viable alternative for nondestructive evaluation despite lower amplitudes.Cong Zhu SunAnthony SinclairTobin FilleterMDPI AGarticleelectromagnetic acoustic transducerperiodic permanent magnetmagnetostrictionLorentzshear horizontal wavesteelChemical technologyTP1-1185ENSensors, Vol 21, Iss 7700, p 7700 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	electromagnetic acoustic transducer periodic permanent magnet magnetostriction Lorentz shear horizontal wave steel Chemical technology TP1-1185
spellingShingle	electromagnetic acoustic transducer periodic permanent magnet magnetostriction Lorentz shear horizontal wave steel Chemical technology TP1-1185 Cong Zhu Sun Anthony Sinclair Tobin Filleter Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel
description	The periodic permanent magnet electromagnetic acoustic transducer (PPM EMAT) is a sensor that can generate and receive shear horizontal (SH) waves without direct contact with the inspected medium using the Lorentz mechanism. However, the PPM EMAT experiences high signal variance on ferromagnetic steel under specific conditions, such as a change in signal amplitude when the sensor is moved in the direction of SH wave propagation. Magnetostriction effects are hypothesized to be the cause of these anomalous behaviors; the objective of this paper is to determine the relative strengths of the magnetostriction and Lorentz wave generation mechanisms for this type of EMAT on steel. This goal is accomplished through the use of a second EMAT, which induces only magnetostriction (MS-EMAT), to calibrate a novel semi-empirical magnetostriction model. It is found that magnetostriction effects reduce the amplitude of the SH wave generated by this particular PPM EMAT transmitter by an average of 29% over a range of input currents. It is also determined that magnetostriction is significant only in the investigated PPM EMAT transmitter, not the receiver. In terms of practical application, it is shown that the MS-EMAT is less sensitive to changes in the static and dynamic fields than PPM EMATs at specific operating points; this makes the MS-EMAT a viable alternative for nondestructive evaluation despite lower amplitudes.
format	article
author	Cong Zhu Sun Anthony Sinclair Tobin Filleter
author_facet	Cong Zhu Sun Anthony Sinclair Tobin Filleter
author_sort	Cong Zhu Sun
title	Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel
title_short	Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel
title_full	Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel
title_fullStr	Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel
title_full_unstemmed	Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel
title_sort	influence of magnetostriction induced by the periodic permanent magnet electromagnetic acoustic transducer (ppm emat) on steel
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b1a0f3041af344738fe2aa12c9af1ba2
work_keys_str_mv	AT congzhusun influenceofmagnetostrictioninducedbytheperiodicpermanentmagnetelectromagneticacoustictransducerppmematonsteel AT anthonysinclair influenceofmagnetostrictioninducedbytheperiodicpermanentmagnetelectromagneticacoustictransducerppmematonsteel AT tobinfilleter influenceofmagnetostrictioninducedbytheperiodicpermanentmagnetelectromagneticacoustictransducerppmematonsteel
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Influence of Magnetostriction Induced by the Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on Steel

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