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Paper Abstract and Keywords
Presentation 2023-05-18 14:35
Structural optimization of the first parabolic reflector of DPLUS
Shoki Ieiri, KyoHei Yamada, Chen Kang, Takeshi Morita (The Univ. of Tokyo) US2023-6
Abstract (in Japanese) (See Japanese page) 
(in English) A high-frequency ultrasonic transducer with focusing mechanism using two parabolic surfaces (DPLUS) is structurally optimized in terms of focal length while keeping the focus point of the first parabolic structure fixed. As a result of the finite element analysis, we found that there exists a trade-off relationship between energy loss due to longitudinal and transverse mode conversion and diffusion loss depending on the path length, and obtained the optimal structure. The obtained optimal structure is expected to have an energy density about 1.6 times higher than the current one at the focal point. Furthermore, we have shown the possibility of introducing high-intensity ultrasonic waves with an energy line density about three times higher than that of the conventional DPLUS by inserting a slit at the root of the thin rod waveguide for the optimum structure.
Keyword (in Japanese) (See Japanese page) 
(in English) DPLUS / acoustic waveguide / high-intensity ultrasound / finite element analysis / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 36, US2023-6, pp. 28-32, May 2023.
Paper # US2023-6 
Date of Issue 2023-05-11 (US) 
ISSN 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 US2023-6

Conference Information
Committee US  
Conference Date 2023-05-18 - 2023-05-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Surugadai Campus, Nihon University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Nonlinear acoustics, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2023-05-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Structural optimization of the first parabolic reflector of DPLUS 
Sub Title (in English)  
Keyword(1) DPLUS  
Keyword(2) acoustic waveguide  
Keyword(3) high-intensity ultrasound  
Keyword(4) finite element analysis  
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Keyword(6)  
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1st Author's Name Shoki Ieiri  
1st Author's Affiliation The University of Tokyo (The Univ. of Tokyo)
2nd Author's Name KyoHei Yamada  
2nd Author's Affiliation The University of Tokyo (The Univ. of Tokyo)
3rd Author's Name Chen Kang  
3rd Author's Affiliation The University of Tokyo (The Univ. of Tokyo)
4th Author's Name Takeshi Morita  
4th Author's Affiliation The University of Tokyo (The Univ. of Tokyo)
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Speaker Author-1 
Date Time 2023-05-18 14:35:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2023-6 
Volume (vol) vol.123 
Number (no) no.36 
Page pp.28-32 
#Pages 5 
Date of Issue 2023-05-11 (US) 

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