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Paper Abstract and Keywords
Presentation 2016-01-29 14:30
Investigation of electroacoustic transformation device -Thermophone- for radiating broadband ultrasound
Takuya Nishioka, Shinji Takayanagi, Olivier Burbuiere, Mami Matsukawa (Doshisha Univ.), Takaaki Asada (Murata Manufacturing Co., Ltd.), Shizuko Hiryu (Doshisha Univ.) US2015-102 EA2015-65
Abstract (in Japanese) (See Japanese page) 
(in English) We investigated the fundamental characteristics of the electric-sound transduction device -thermophone-. A thermophone generates sound via time-varying Joule heating of an electrically conductive layer, which leads to expansion and contraction of a small pocket of air near the surface of the metallic thin film. The results show that the frequency characteristics are flat up to 190 kHz and the directivity patterns are in good agreement with theoretical predictions, assuming a rectangular diaphragm with the same size as the metal film. In addition, we successfully reached high conversion efficiency(acoustic energy / input power) approximately 150 times greater than the one we used at the same power consumption (0.6W) by changing materials and thicknesses of those layers.
Keyword (in Japanese) (See Japanese page) 
(in English) Aerial ultrasound / Three layered structure / Conversion efficiency / Bio SONAR / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 423, US2015-102, pp. 105-110, Jan. 2016.
Paper # US2015-102 
Date of Issue 2016-01-21 (US, EA) 
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 US2015-102 EA2015-65

Conference Information
Committee US EA  
Conference Date 2016-01-28 - 2016-01-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Kansai University, Centenary Memorial Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonic and Underwater Acoustics, and Related Topics 
Paper Information
Registration To US 
Conference Code 2016-01-US-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of electroacoustic transformation device -Thermophone- for radiating broadband ultrasound 
Sub Title (in English)  
Keyword(1) Aerial ultrasound  
Keyword(2) Three layered structure  
Keyword(3) Conversion efficiency  
Keyword(4) Bio SONAR  
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1st Author's Name Takuya Nishioka  
1st Author's Affiliation Doshisha University (Doshisha Univ.)
2nd Author's Name Shinji Takayanagi  
2nd Author's Affiliation Doshisha University (Doshisha Univ.)
3rd Author's Name Olivier Burbuiere  
3rd Author's Affiliation Doshisha University (Doshisha Univ.)
4th Author's Name Mami Matsukawa  
4th Author's Affiliation Doshisha University (Doshisha Univ.)
5th Author's Name Takaaki Asada  
5th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing Co., Ltd.)
6th Author's Name Shizuko Hiryu  
6th Author's Affiliation Doshisha University (Doshisha Univ.)
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Speaker Author-1 
Date Time 2016-01-29 14:30:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2015-102, EA2015-65 
Volume (vol) vol.115 
Number (no) no.423(US), no.424(EA) 
Page pp.105-110(US), pp.63-68(EA) 
#Pages 6 
Date of Issue 2016-01-21 (US, EA) 

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