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| Presentation | 2011-01-20 11:30 Second Harmonic Component in Focused Gaussian Beam Transmitting through a Layer with Nonuniformly Distributed Sound-Speed Shigemi Saito (Tokai Univ.)  US2010-95 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | A method to measure automatically and display two-dimensionally the nonlinearity parameter B/A in the biological sample inserted in the focal region of the focused Gaussian beam in water has previously been presented. Although the nonuniformity of B/A in the sample was then observed, the measured B/A is not fully reliable because the measuring principle assumes uniform samples. In this article, the fundamental and second harmonic components in the focused sound transmitting through the layer of the medium with a monotonous sound-speed variance in one direction are analyzed and the influence on the B/A measurement is investigated. The Khokhlov-Zabolotskaya equation including the small perturbation due to a slightly nonuniform sound-speed is solved with the successive approximation. As a result, it is clarified that the sound pressure induced by the perturbation does not affect the received signal in principle in the case of the variance normal to the acoustic axis. On the other hand, in the case of axial variance, it is shown that the amplitude of the second harmonic slightly differs from that defined by the average sound-speed. Then the measurement error of the nonlinearity coefficient b is generated by the rate less than 1.8 times the axial change-rate in sound-speed within the layer. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Focused Sound / Nonlinear Propagation / Second Harmonic / Nonuniform Medium / Successive Approximation / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 110, no. 366, US2010-95, pp. 19-24, Jan. 2011. | |
| Paper # | US2010-95 | |
| Date of Issue | 2011-01-13 (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 | US2010-95 |
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| Conference Information | |
| Committee | EA US |
| Conference Date | 2011-01-20 - 2011-01-21 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Doshisha Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonic and Underwater Acoustics，and Related Topics |
| Paper Information | |
| Registration To | US |
| Conference Code | 2011-01-EA-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Second Harmonic Component in Focused Gaussian Beam Transmitting through a Layer with Nonuniformly Distributed Sound-Speed |
| Sub Title (in English) | |
| Keyword(1) | Focused Sound |
| Keyword(2) | Nonlinear Propagation |
| Keyword(3) | Second Harmonic |
| Keyword(4) | Nonuniform Medium |
| Keyword(5) | Successive Approximation |
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| 1st Author's Name | Shigemi Saito |
| 1st Author's Affiliation | Tokai University (Tokai Univ.) |
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| Speaker | Author-1 |
| Date Time | 2011-01-20 11:30:00 |
| Presentation Time | 30 minutes |
| Registration for | US |
| Paper # | US2010-95 |
| Volume (vol) | vol.110 |
| Number (no) | no.366 |
| Page | pp.19-24 |
| #Pages | 6 |
| Date of Issue | 2011-01-13 (US) |
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