Line-focusing of ultrasonics SV wave by electromagnetic acoustic transducer

Ogi, Hirotsugu; Hirao, Masahiko; Ohtani, Toshihiro

Journal of the Acoustical Society of America, 1998, 103(5), 2411-2415

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Identifier to cite or link to this item: https://hdl.handle.net/11094/84151

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Title
Line-focusing of ultrasonics SV wave by electromagnetic acoustic transducer
Creator
NRID
1000090252626 1000090252626
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Scopus Author ID
35563683500 35563683500
CreatorName
Ogi, Hirotsugu
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
CreatorName
Ohtani, Toshihiro
Description
Hirotsugu Ogi, Masahiko Hirao, Toshihiro Ohtani. Line-focusing of ultrasonics SV wave by electromagnetic acoustic transducer. Journal of the Acoustical Society of America, 1998, 103(5), 2411. https://doi.org/10.1121/1.422760.
Abstract
An electromagnetic acoustic transducer has been developed for line- focusing the shear-vertical (SV) wave in a metal. The EMAT consists of a permanent magnet to supply the bias magnetic field normal to the surface, and a meanderline coil to induce the dynamic field and eddy currents in the surface region of the sample. The meanderline spacing is continuously changed so that the generated SV waves from all segment sources become coherent on the focal line after traveling oblique paths. The printed circuit technique enables the fabrication of such a functionally spaced meanderline coil within 1-μm accuracy. The directivity is measured using a half-cylindrical sample of an aluminum alloy, which shows a much sharper radiation pattern of the focusing EMAT than the EMAT having a meanderline coil of constant spacings. This EMAT is then tested through detecting a shallow notch. The scattered signal from the notch is received by the same EMAT, which shows enough strength even for the notch of 0.2-mm depth.
Publisher
Acoustical Society of America
Source Title
Journal of the Acoustical Society of America
Volume (Issue)
103(5)
Page
2411-2415
Date of Issued
1998-05
Language
English
Handle URL
https://hdl.handle.net/11094/84151
PISSN
00014966
NCID
AA00253792
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1121/1.422760
Access Rights
open access
CopyRight
Copyright 1998 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article