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Paper Abstract and Keywords
Presentation 2026-05-12 14:25
FOPH measurement of the two-dimensional acoustic pressure distribution in water generated by an ELliptical reflector transducer for hIgh-Power ultraSound (ELIPS)
Makoto Shimaoka, Shoki Ieiri (UTokyo), Yumi Matsushita, Masafumi Shimojo, Makoto Higuchi (QST), Chikahiro Imashiro, Takeshi Morita (UTokyo) US2026-6
Abstract (in Japanese) (See Japanese page) 
(in English) The ELliptical reflector transducer for hIgh-Power ultraSound (ELIPS) is capable of broadband frequency operation and is expected to be applied to ultrasonic irradiation of biological tissues and cells in culture vessels. In this study, a fiber-optic probe hydrophone (FOPH) was used to perform two-dimensional measurements of the acoustic pressure distribution generated by ELIPS in water over a driving frequency range of 0.50–1.70 MHz. The results were then compared with numerical simulations. As a result, high acoustic pressures on the order of MPa were obtained at all driving frequencies. Furthermore, good agreement between the experimental and simulation results was observed up to approximately 1.3 MHz. In contrast, at frequencies above approximately 1.5 MHz, the measured acoustic pressure distribution exhibited a non-axisymmetric tilt. In addition, the directivity in the axial direction was found to increase with increasing driving frequency.
Keyword (in Japanese) (See Japanese page) 
(in English) FOPH / Ultrasonic transducer / Acoustic pressure measurement / ELIPS / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 14, US2026-6, pp. 26-31, May 2026.
Paper # US2026-6 
Date of Issue 2026-05-05 (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 US2026-6

Conference Information
Committee US  
Conference Date 2026-05-12 - 2026-05-12 
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 2026-05-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) FOPH measurement of the two-dimensional acoustic pressure distribution in water generated by an ELliptical reflector transducer for hIgh-Power ultraSound (ELIPS) 
Sub Title (in English)  
Keyword(1) FOPH  
Keyword(2) Ultrasonic transducer  
Keyword(3) Acoustic pressure measurement  
Keyword(4) ELIPS  
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Keyword(6)  
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1st Author's Name Makoto Shimaoka  
1st Author's Affiliation The University of Tokyo (UTokyo)
2nd Author's Name Shoki Ieiri  
2nd Author's Affiliation The University of Tokyo (UTokyo)
3rd Author's Name Yumi Matsushita  
3rd Author's Affiliation National Institutes for Quantum Science and Technology, Institute for Quantum Medical Science (QST)
4th Author's Name Masafumi Shimojo  
4th Author's Affiliation National Institutes for Quantum Science and Technology, Institute for Quantum Medical Science (QST)
5th Author's Name Makoto Higuchi  
5th Author's Affiliation National Institutes for Quantum Science and Technology, Institute for Quantum Medical Science (QST)
6th Author's Name Chikahiro Imashiro  
6th Author's Affiliation The University of Tokyo (UTokyo)
7th Author's Name Takeshi Morita  
7th Author's Affiliation The University of Tokyo (UTokyo)
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Speaker Author-1 
Date Time 2026-05-12 14:25:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2026-6 
Volume (vol) vol.126 
Number (no) no.14 
Page pp.26-31 
#Pages 6 
Date of Issue 2026-05-05 (US) 

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