Galfenol-based directional magnetostrictive patch transducer for guided Lamb wave techniques

Yoo, Byung Hoon; Na, Suok-Min; Flatau, Alison B.; Pines, Darryll J.

doi:10.1117/12.2046601

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The phase difference was caused because the GLWs generated from the offcentered PZT actuator arrived earlier at the sensing area of the MPT than that of the PZT transducer. The direct comparison of the sensing performance between the PZT transducer and the nickel-based MPT (Yoo et al, 2014b) is not addressed in this article, because this work focuses on presenting the magnetic shape anisotropy effect in the specially configured nickel patches used for developing a directional MPT.…”

Section: Glw Sensing By Mptsmentioning

confidence: 99%

Magnetic shape anisotropy effect on sensing performance and directional sensitivity in magnetostrictive nickel patch transducer

Yoo

Flatau

et al. 2015

Journal of Intelligent Material Systems and Structures

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This article presents the magnetic shape anisotropy effect on sensing performance and directional sensitivity in a directional magnetostrictive patch transducer using a uniaxial comb-shaped nickel patch, for the use of ultrasonic guided Lamb wave technology in metallic planar structure. The uniaxial comb patch was modified from a disc-shaped patch made of polycrystalline nickel, so that its comb fingers were aligned to a specific radial direction to promote the magnetic shape anisotropy in the nickel patch. Previously, it was found that a magnetostrictive patch transducer using a nickel disc patch appeared to have omnidirectional sensitivity for sensing guided Lamb waves in an aluminum plate due to the isotropic magnetostrictive nature of polycrystalline nickel. In this work, we initially investigated a theoretical approach to determine demagnetization factor change caused by the geometrical shape modification of a nickel patch, which strongly correlated with a specific magnetization characteristic of the patch. Then, experimental guided Lamb wave analysis was followed to demonstrate the directional guided Lamb wave sensitivity of magnetostrictive patch transducers using nickel patches with three different geometrical configurations. We verified from the experimental guided Lamb wave testing that the proposed magnetostrictive patch transducer using the uniaxial comb-shaped nickel patch exhibited excellent directional sensitivity along the comb fingers’ orientation in the aluminum plate.

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Section: Glw Sensing By Mptsmentioning

confidence: 99%

Magnetic shape anisotropy effect on sensing performance and directional sensitivity in magnetostrictive nickel patch transducer

Yoo

Flatau

et al. 2015

Journal of Intelligent Material Systems and Structures

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“…Both Galfenol-based flow and torque sensors have successfully demonstrated their sensing capability based on the specific magnetostriction features of the highly textured Galfenol. In our previous work [30], we used a highly textured Galfenol patch with large magnetostriction of ∼270 ppm along the <100> preferred orientation in the development of a circular MPT (CMPT). The CMPT using the textured Galfenol patch demonstrated outstanding directional sensitivity to the incoming GLWs along the preferred orientation of the Galfenol patch.…”

Section: Introductionmentioning

confidence: 99%

Directional magnetostrictive patch transducer based on Galfenol’s anisotropic magnetostriction feature

Yoo¹,

Na²,

Flatau³

et al. 2014

Smart Mater. Struct.

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This paper presents the investigation of a directional magnetostrictive patch transducer (MPT) composed of a highly textured Galfenol (Fe–Ga alloy) patch in the use of ultrasonic guided Lamb wave (GLW) inspection techniques for isotropic planar structures. Recently, the actuation and sensing performance of an MPT using a disc patch made of polycrystalline nickel was reported, based on GLW testing in thin aluminum plates. The nickel-based MPT appeared to have omnidirectional GLW sensitivity in the metallic plate because of the isotropic magnetostrictive nature of polycrystalline nickel with random orientation. In this work, we investigated two viable methods to control and improve MPT’s directional sensitivity for detecting GLWs in metallic plate structures. First, we proposed a circular MPT (CMPT) using the highly textured Galfenol patch with a large magnetostriction of ∼270 ppm along a <100> preferred orientation parallel to the patch’s rolling direction. The CMPT exhibited outstanding sensitivity to incoming GLWs along the <100> direction of the patch in a thin aluminum plate. This was mainly due to the unique anisotropic magnetostriction effect of the textured Galfenol patch. In addition to the use of the Galfenol material, we developed a novel cruciform MPT (XMPT) containing four solenoid sensing coils that possessed individual directional sensing preferences, corresponding to the orientations of the sensing coils. The directional sensing performance of the XMPT was initially validated by using the polycrystalline nickel patch with the isotropic magnetostrictive characteristic, exhibiting the remarkable directionality attributes of the individual sensing elements. Of particular interest was that the XMPT combined with the highly textured Galfenol patch demonstrated excellent directional sensitivity corresponding to the Galfenol’s preferred orientation. And the directional sensing feature was noticeably enhanced by incorporating the textured Galfenol patch into the proposed XMPT system.

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Research on Dynamic Characteristic of High-Power Magnetostrictive Transducer in high frequency application

Yan¹,

Zhang²,

Li³

et al. 2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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The emphasis of this paper is to study the high frequency dynamic characteristic of highpower transducer based on giant magnetostrictive material. A prototype of high-power magnetostrictive transducer using in kHz magnitude frequency situation is introduced. The accurate inductance relation in magnetostrictive transducer is calculated, and its dynamic impedance characteristics of the transducer are summarized. Then, the experimental test-bench is set, the impedance-frequency characteristics and high frequency dynamic characteristics are discussed. The results show that magnetostrictive transducer has predominant mechanical strain effect at mechanical resonance situation, its magnetostriction coupling coefficient can up to 0.592, and has 0.05mm output strain at 1200Hz frequency. Researches and its results in this paper can helps for the calculation and construction of magnetostrictive transducer using in high frequency application.

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Galfenol-based directional magnetostrictive patch transducer for guided Lamb wave techniques

Cited by 3 publications

References 10 publications

Magnetic shape anisotropy effect on sensing performance and directional sensitivity in magnetostrictive nickel patch transducer

Magnetic shape anisotropy effect on sensing performance and directional sensitivity in magnetostrictive nickel patch transducer

Directional magnetostrictive patch transducer based on Galfenol’s anisotropic magnetostriction feature

Research on Dynamic Characteristic of High-Power Magnetostrictive Transducer in high frequency application

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