| IEICE Technical Committee Submission System Conference Paper's Information |
Online Proceedings [Sign in] Tech. Rep. Archives |
| Go Top Page | Go Previous | [Japanese] / [English] |
| Paper Abstract and Keywords | ||
| Presentation | 2008-08-29 14:30 A Basic Study of Focusing Characteristics of Acoustic Aplanatic Lens for Ambient Noise Imaging Kazuyoshi Mori, Hanako Ogasawara, Toshiaki Nakamura (NDA), Yuji Sato (Univ. Tsukuba), Takenobu Tsuchiya, Tetsuo Anada, Nobuyuki Endoh (Kanagawa Univ.)  US2008-28 |
|
| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Much attention has been paid to the new idea of detecting objects by using ocean ambient noise. This concept is called ambient noise imaging (ANI). To design an ANI system, the authors analyzed the sound field focused by an acoustic lens system constructed with a single spherical biconcave lens using the Finite Difference Time Domain (FDTD) method and the reduced scale trial of one-fifth space in a water tank. These results showed that the lens with an aperture size of 2.0 m has sufficient resolution for realizing the ANI system; for example, the beam width is 1 deg at 60 kHz. In this study, we apply an aplanatic lens correcting spherical and comma aberrations to ANI system. The dependences of aperture size, source range and refraction index are surveyed by 2-D FDTD method. And the results of plane wave incidence are also analyzed by 3-D FDTD method. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Ambient Noise Imaging / Acoustic Lens / FDTD Method / Directional Resolution / Aplanatic Lens / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 108, no. 196, US2008-28, pp. 11-16, Aug. 2008. | |
| Paper # | US2008-28 | |
| Date of Issue | 2008-08-22 (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 | US2008-28 |
|
| Conference Information | |
| Committee | US |
| Conference Date | 2008-08-29 - 2008-08-29 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Jamstec |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Underwater Acoustics |
| Paper Information | |
| Registration To | US |
| Conference Code | 2008-08-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Basic Study of Focusing Characteristics of Acoustic Aplanatic Lens for Ambient Noise Imaging |
| Sub Title (in English) | |
| Keyword(1) | Ambient Noise Imaging |
| Keyword(2) | Acoustic Lens |
| Keyword(3) | FDTD Method |
| Keyword(4) | Directional Resolution |
| Keyword(5) | Aplanatic Lens |
| Keyword(6) | |
| Keyword(7) | |
| 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 | Yuji Sato |
| 4th Author's Affiliation | University of Tsukuba (Univ. Tsukuba) |
| 5th Author's Name | Takenobu Tsuchiya |
| 5th Author's Affiliation | Kanagawa University (Kanagawa Univ.) |
| 6th Author's Name | Tetsuo Anada |
| 6th Author's Affiliation | Kanagawa University (Kanagawa Univ.) |
| 7th Author's Name | Nobuyuki Endoh |
| 7th Author's Affiliation | Kanagawa University (Kanagawa Univ.) |
| 8th Author's Name | |
| 8th Author's Affiliation | () |
| 9th Author's Name | |
| 9th Author's Affiliation | () |
| 10th Author's Name | |
| 10th Author's Affiliation | () |
| 11th Author's Name | |
| 11th Author's Affiliation | () |
| 12th Author's Name | |
| 12th Author's Affiliation | () |
| 13th Author's Name | |
| 13th Author's Affiliation | () |
| 14th Author's Name | |
| 14th Author's Affiliation | () |
| 15th Author's Name | |
| 15th Author's Affiliation | () |
| 16th Author's Name | |
| 16th Author's Affiliation | () |
| 17th Author's Name | |
| 17th Author's Affiliation | () |
| 18th Author's Name | |
| 18th Author's Affiliation | () |
| Speaker | Author-1 |
| Date Time | 2008-08-29 14:30:00 |
| Presentation Time | 30 minutes |
| Registration for | US |
| Paper # | US2008-28 |
| Volume (vol) | vol.108 |
| Number (no) | no.196 |
| Page | pp.11-16 |
| #Pages | 6 |
| Date of Issue | 2008-08-22 (US) |
[Return to Top Page]