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| Presentation | 2009-08-28 14:55 A Basic Study of Utilization of Time Reversal Process for Ambient Noise Imaging Using Acoustic Lens Kazuyoshi Mori, Hanako Ogasawara, Toshiaki Nakamura (NDA), Takenobu Tsuchiya, Nobuyuki Endoh (Kanagawa Univ.)  US2009-33 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In ambient noise imaging (ANI), each pixel of a target image is mapped by either monochrome or pseudo-color to represent its acoustic intensity in each direction. This intensity is obtained by measuring the target object’s reflecting or scattering wave, with ocean background noise serving as the sound source. In the case using an acoustic lens, a C-mode image is created by ANI system, where receivers are arranged on a focal plane and each pixel’s color corresponds to the intensity of each receiver output. There is no consideration for estimating a target range in this method, because it is impossible to measure a traveling time between a transducer and a target like an active imaging method. In this study, we applied a time reversal process to estimate a target range on ANI system using an acoustic lens. We calculated the scattering wave from a rigid target object in an acoustic noise field generated by a large number of point sources using the 2-D finite difference time domain (FDTD) method. The scattering wave converged by the lens was then recorded on each receiver. Next, the time reversed wave of the scattering wave was re-radiated from each receiver position. It was suggested to estimate the target range because the maximum position of the re-radiated sound pressure field was close to the target position. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Ambient Noise Imaging / Acoustic Lens / FDTD Method / Time Reversal Process / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 109, no. 180, US2009-33, pp. 21-26, Aug. 2009. | |
| Paper # | US2009-33 | |
| Date of Issue | 2009-08-21 (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) | |
| Download PDF | US2009-33 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2009-08-28 - 2009-08-28 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | US |
| Conference Code | 2009-08-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Basic Study of Utilization of Time Reversal Process for Ambient Noise Imaging Using Acoustic Lens |
| Sub Title (in English) | |
| Keyword(1) | Ambient Noise Imaging |
| Keyword(2) | Acoustic Lens |
| Keyword(3) | FDTD Method |
| Keyword(4) | Time Reversal Process |
| Keyword(5) | |
| Keyword(6) | |
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| Keyword(8) | |
| 1st Author's Name | Kazuyoshi Mori |
| 1st Author's Affiliation | National Defense Academy (NDA) |
| 2nd Author's Name | Hanako Ogasawara |
| 2nd Author's Affiliation | National Defense Academy (NDA) |
| 3rd Author's Name | Toshiaki Nakamura |
| 3rd Author's Affiliation | National Defense Academy (NDA) |
| 4th Author's Name | Takenobu Tsuchiya |
| 4th Author's Affiliation | Kanagawa University (Kanagawa Univ.) |
| 5th Author's Name | Nobuyuki Endoh |
| 5th Author's Affiliation | Kanagawa University (Kanagawa Univ.) |
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| Speaker | Author-1 |
| Date Time | 2009-08-28 14:55:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2009-33 |
| Volume (vol) | vol.109 |
| Number (no) | no.180 |
| Page | pp.21-26 |
| #Pages | 6 |
| Date of Issue | 2009-08-21 (US) |
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