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Paper Abstract and Keywords
Presentation 2008-09-25 14:00
Development of a Micro-LFB Ultrasonic Device
Jun-ichi Kushibiki, Yuji Ohashi, Mototaka Arakawa, Tomoya Tanaka, Sho Yoshida (Tohoku Univ) US2008-33
Abstract (in Japanese) (See Japanese page) 
(in English) A micro line-focus-beam (LFB) ultrasonic device was developed to improve spatial resolution of the LFB ultrasonic material characterization (UMC) system which is capable of quantitatively evaluating various solid materials, including single crystals, by measuring the phase velocity of leaky surface acoustic waves (LSAWs) propagating on a water-loaded specimen surface. A different point from the normal-LFB device was that the micro-LFB device had a cylindrically convex surface with a large curvature radius for fabricating a ZnO-film transducer. We evaluated spatial resolution of the device at 225 MHz by measuring focused acoustic fields using a point-focus-beam ultrasonic device as a detecting probe. 3dB-down width of the acoustic fields along unfocused direction (perpendicular to the LSAW propagation direction) was improved to be 0.26 mm for the micro-LFB device, as compared with that of 0.92 mm for the normal-LFB device. We also verify a capability of anisotropy detection through measurements of angular dependence of LSAW velocities for anisotropic crystal. LSAW velocity distributions measured for a Z-cut ZnO crystal clearly showed that the micro-LFB device could detect velocity variations and inhomogeneities which could not be observed by the normal-LFB device. This device will be useful for characterizing small precious samples.
Keyword (in Japanese) (See Japanese page) 
(in English) line-focus-beam ultrasonic material characterization system / micro-LFB ultrasonic device / spatial resolution / acoustic field / leaky surface acoustic wave velocity / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 212, US2008-33, pp. 7-12, Sept. 2008.
Paper # US2008-33 
Date of Issue 2008-09-18 (US) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee US  
Conference Date 2008-09-25 - 2008-09-26 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To US 
Conference Code 2008-09-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Development of a Micro-LFB Ultrasonic Device 
Sub Title (in English)  
Keyword(1) line-focus-beam ultrasonic material characterization system  
Keyword(2) micro-LFB ultrasonic device  
Keyword(3) spatial resolution  
Keyword(4) acoustic field  
Keyword(5) leaky surface acoustic wave velocity  
1st Author's Name Jun-ichi Kushibiki  
1st Author's Affiliation Tohoku University (Tohoku Univ)
2nd Author's Name Yuji Ohashi  
2nd Author's Affiliation Tohoku University (Tohoku Univ)
3rd Author's Name Mototaka Arakawa  
3rd Author's Affiliation Tohoku University (Tohoku Univ)
4th Author's Name Tomoya Tanaka  
4th Author's Affiliation Tohoku University (Tohoku Univ)
5th Author's Name Sho Yoshida  
5th Author's Affiliation Tohoku University (Tohoku Univ)
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Date Time 2008-09-25 14:00:00 
Presentation Time 30 
Registration for US 
Paper # IEICE-US2008-33 
Volume (vol) IEICE-108 
Number (no) no.212 
Page pp.7-12 
#Pages IEICE-6 
Date of Issue IEICE-US-2008-09-18 

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