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Paper Abstract and Keywords
Presentation 2020-01-22 14:00
[Poster Presentation] Comparison of propagation phenomenon of ultrasound and secondary wave using numerical analysis of nonlinear acoustics -- sound wave diffracting to occlusion area --
Motoharu Oyama, Kan Okubo (Tokyo Metropolitan Univ.) US2019-85
Abstract (in Japanese) (See Japanese page) 
(in English) Feasibility of acoustic sensing for occlusion areas combining super-directivity speaker and pulse compression technique has been investigated experimentally. However, the detailed mechanism of the propagation process has not been sufficiently discussed, and therefore numerical examination is important to clarify this issue. In this study, numerical simulation is performed using the governing equation of the sound field considering the nonlinearity; the propagation process of the secondary wave field generated from the parametric sound source is numerically examined. In this presentation, we compare the propagation process of the ultrasound and the secondary wave. It is shown that the secondary wave travels to occlusion areas by computing the diffraction process of each frequency component of sound. In addition, it is
demonstrated numerically that the secondary wave is effective for the object detection in occlusion areas.
Keyword (in Japanese) (See Japanese page) 
(in English) nonlinear acoustics / parametric array / occlusion areas sensing / numerical analysis of sound wave propagation / FDTD method / diffraction / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 374, US2019-85, pp. 83-87, Jan. 2020.
Paper # US2019-85 
Date of Issue 2020-01-15 (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)
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Conference Information
Committee EA US  
Conference Date 2020-01-22 - 2020-01-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Doshisha Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonics, and Related Topics 
Paper Information
Registration To US 
Conference Code 2020-01-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Comparison of propagation phenomenon of ultrasound and secondary wave using numerical analysis of nonlinear acoustics 
Sub Title (in English) sound wave diffracting to occlusion area 
Keyword(1) nonlinear acoustics  
Keyword(2) parametric array  
Keyword(3) occlusion areas sensing  
Keyword(4) numerical analysis of sound wave propagation  
Keyword(5) FDTD method  
Keyword(6) diffraction  
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1st Author's Name Motoharu Oyama  
1st Author's Affiliation Tokyo Metropolitan Univeersity (Tokyo Metropolitan Univ.)
2nd Author's Name Kan Okubo  
2nd Author's Affiliation Tokyo Metropolitan Univeersity (Tokyo Metropolitan Univ.)
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Date Time 2020-01-22 14:00:00 
Presentation Time 120 minutes 
Registration for US 
Paper # US2019-85 
Volume (vol) vol.119 
Number (no) no.374 
Page pp.83-87 
#Pages
Date of Issue 2020-01-15 (US) 


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