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Paper Abstract and Keywords
Presentation 2008-01-29 14:45
Measurement of acoustic property of liquid medium beyond a polymer plate
Shigemi Saito, Takanori Watanabe (Tokai Univ.) US2007-104
Abstract (in Japanese) (See Japanese page) 
(in English) Using focused ultrasound, the measurement for linear acoustic properties of a sample with volume as small as 0.1 ml, filling the space of about 1 mm thickness between a polystyrene plate and a tungsten reflector, is investigated. The experiment is conducted with 18.6 MHz burst waves radiated from the Gaussian source of 10.65 mm focal length. Because of small obliquely incident components of the present source with low focusing gain, the sound speed c in the sample is determined with the time difference between the waves reflected from the rear surface of polystyrene plate and the tungsten reflector, based on the theory for normal incident plane waves. The attenuation coefficient $\alpha$ is also measured from the reduced rate of the sound amplitude transmitted through the sample. On the other hand, in order to obtain the density $\rho$ related to the characteristic impedance $\rho$c, it is initially intended to measure the impedance mismatching utilizing the reflected wave from the rear surface of the plate. However, there exists an inconvenience that, depending on $\rho$ and c, the effective reflection coefficient at the rear surface of the plate becomes significantly smaller than that of normal incident plane waves, because the mode conversion to shear waves occurs more there due to increased oblique components with deflection at the front surface. By virtue of this, deriving the reduction rate of the reflection coefficient as a function of $\rho$ and c, $\rho$ is determined by searching the value to make the theoretical reflection coefficient coincide with the experimental reflection coefficient. The experimental result for liquid samples demonstrates the validity of the present measurement method.
Keyword (in Japanese) (See Japanese page) 
(in English) Acoustic Window / Focused Sound / Polymer Plate / Mode Conversion / Acoustic Impedance Microscopy / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 468, US2007-104, pp. 43-48, Jan. 2008.
Paper # US2007-104 
Date of Issue 2008-01-22 (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 US2007-104

Conference Information
Committee EA US  
Conference Date 2008-01-28 - 2008-01-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Kansai University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To US 
Conference Code 2008-01-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Measurement of acoustic property of liquid medium beyond a polymer plate 
Sub Title (in English)  
Keyword(1) Acoustic Window  
Keyword(2) Focused Sound  
Keyword(3) Polymer Plate  
Keyword(4) Mode Conversion  
Keyword(5) Acoustic Impedance Microscopy  
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Keyword(7)  
Keyword(8)  
1st Author's Name Shigemi Saito  
1st Author's Affiliation Tokai University (Tokai Univ.)
2nd Author's Name Takanori Watanabe  
2nd Author's Affiliation Tokai University (Tokai Univ.)
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Speaker Author-1 
Date Time 2008-01-29 14:45:00 
Presentation Time 30 minutes 
Registration for US 
Paper # US2007-104 
Volume (vol) vol.107 
Number (no) no.468 
Page pp.43-48 
#Pages 6 
Date of Issue 2008-01-22 (US) 

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