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Paper Abstract and Keywords
Presentation 2015-11-09 15:15
Non-contact ultrasonic imaging system using time reversal
Hirotaka Saitoh, Hideyuki Nomura (UEC) US2015-70
Abstract (in Japanese) (See Japanese page) 
(in English) Ultrasonic imaging using a pulse echo is decreasing azimuth resolution and probe of device must contact with target. In this study, to resolve the problem, non-contact ultrasonic imaging using a time reversal (TR) signal is proposed and experimentally verified. In order to realize the TR non-contact ultrasonic imaging, effects of noise in the TR signal on the focusing of sound wave in time and spatial domains must be considered. Experimental results indicated that the excluding the noise increased the signal-to-noise ration of the focusing signal. Imaging brass plates with and without an appendage were carried out as an application of the proposed method. Obtained vibration distribution images indicated that the proposed imaging method can visualize a defect on a plate, however, reducing the bandwidth of the focusing wave is necessary to improve image quality.
Keyword (in Japanese) (See Japanese page) 
(in English) Time reversal / Non-contact / Focus / Ultrasonic imaging / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 299, US2015-70, pp. 29-34, Nov. 2015.
Paper # US2015-70 
Date of Issue 2015-11-02 (US) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 US  
Conference Date 2015-11-09 - 2015-11-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Ekimae Office for Inovation hub, AIST 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To US 
Conference Code 2015-11-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Non-contact ultrasonic imaging system using time reversal 
Sub Title (in English)  
Keyword(1) Time reversal  
Keyword(2) Non-contact  
Keyword(3) Focus  
Keyword(4) Ultrasonic imaging  
1st Author's Name Hirotaka Saitoh  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Hideyuki Nomura  
2nd Author's Affiliation The University of Electro-Communications (UEC)
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Date Time 2015-11-09 15:15:00 
Presentation Time 25 
Registration for US 
Paper # IEICE-US2015-70 
Volume (vol) IEICE-115 
Number (no) no.299 
Page pp.29-34 
#Pages IEICE-6 
Date of Issue IEICE-US-2015-11-02 

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