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Paper Abstract and Keywords
Presentation 2007-09-28 13:30
Nonlinearity parameter measurement for polymer plates using focused ultrasound
Shigemi Saito, Yoshiro Motohashi (Tokai Univ.) US2007-49
Abstract (in Japanese) (See Japanese page) 
(in English) The measurement of the nonlinearity parameter B/A based on the finite amplitude method for a 1 mm thick polymer plate which is put, together with a sound reflector set at the back, within the focal region of 18.6 MHz focused ultrasound yields an extraordinary B/A value as large as 27, for example, in polystyrene. Although this may be attributable to a velocity dispersion in the sample to suppress the phase delay of the second harmonic sound due to diffraction and to enhance the second harmonic generation as a result, the dispersion in the polystyrene sample is so small that the resultant phase advance of the second harmonic is only 0.08 radians after a two-way travel in the plate. On the other hand, as a multiple reflection takes place in a small gap between the sample and sound reflector, a phase difference is induced between the fundamental and second harmonic components in the reflected sound. The experiment demonstrates a 0.44 radian phase advance of the second harmonic, which is induced by a 5.5 μm gap. Taking into account these phase advances, the B/A in polystyrene is estimated to be 11.4. The sound dispersion is greater in other polymer samples. When the effects of velocity dispersion and gap are taken into consideration, the B/A values are obtained as 11.9, 10.5, 10.0 and 9.2 for an acrylic, PET, PVC and PC plate, respectively.
Keyword (in Japanese) (See Japanese page) 
(in English) Focused ultrasound / Nonlinearity parameter / Finite amplitude method / Velocity dispersion / Multiple reflection / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 233, US2007-49, pp. 37-42, Sept. 2007.
Paper # US2007-49 
Date of Issue 2007-09-21 (US) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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)
Download PDF US2007-49

Conference Information
Committee US  
Conference Date 2007-09-27 - 2007-09-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To US 
Conference Code 2007-09-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Nonlinearity parameter measurement for polymer plates using focused ultrasound 
Sub Title (in English)  
Keyword(1) Focused ultrasound  
Keyword(2) Nonlinearity parameter  
Keyword(3) Finite amplitude method  
Keyword(4) Velocity dispersion  
Keyword(5) Multiple reflection  
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1st Author's Name Shigemi Saito  
1st Author's Affiliation Tokai University (Tokai Univ.)
2nd Author's Name Yoshiro Motohashi  
2nd Author's Affiliation Tokai University (Tokai Univ.)
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Speaker Author-1 
Date Time 2007-09-28 13:30:00 
Presentation Time 30 minutes 
Registration for US 
Paper # US2007-49 
Volume (vol) vol.107 
Number (no) no.233 
Page pp.37-42 
#Pages 6 
Date of Issue 2007-09-21 (US) 

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