| Presentation | 2004/8/13 Comparison of Sound Fields Focused by Underwater Acoustic Lens of Various Shapes Using FDTD Analysis Kazuyoshi MORI, Toshiaki NAKAMURA, Tomoki YOKOYAMA, Akio HASEGAWA, Minoru MATSUDA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The underwater imaging sonar system with an acoustic lens is again receiving considerable attention since it dose not require a complex signal processing equipment for beam forming. The lens system used in this type of sonar was designed by the ray theory or by a hybrid method of the ray and wave theories. Recently, the numerical analysis result of acoustic lens system using the parabolic equation method was also reported. In this report, the sound fields focused by underwater acoustic lens of various shapes are analyzed using Finite Difference Time Domain (FDTD) method. The focal region of the sound pressure field generated by spherical, aspheric and Fresnel lens are compared. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | FDTD Method / Acoustic Lens / Focusing Characteristics / Spherical Lens / Aspheric Lens / Fresnel Lens |
| Paper # | US2004-38 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2004/8/13(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
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| Assistant | |
| Paper Information | |
| Registration To | Ultrasonics (US) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Comparison of Sound Fields Focused by Underwater Acoustic Lens of Various Shapes Using FDTD Analysis |
| Sub Title (in English) | |
| Keyword(1) | FDTD Method |
| Keyword(2) | Acoustic Lens |
| Keyword(3) | Focusing Characteristics |
| Keyword(4) | Spherical Lens |
| Keyword(5) | Aspheric Lens |
| Keyword(6) | Fresnel Lens |
| 1st Author's Name | Kazuyoshi MORI |
| 1st Author's Affiliation | Department of Earth and Ocean Sciences, National Defense Academy() |
| 2nd Author's Name | Toshiaki NAKAMURA |
| 2nd Author's Affiliation | Department of Earth and Ocean Sciences, National Defense Academy |
| 3rd Author's Name | Tomoki YOKOYAMA |
| 3rd Author's Affiliation | Department of Earth and Ocean Sciences, National Defense Academy |
| 4th Author's Name | Akio HASEGAWA |
| 4th Author's Affiliation | Department of Earth and Ocean Sciences, National Defense Academy |
| 5th Author's Name | Minoru MATSUDA |
| 5th Author's Affiliation | Department of Media-Information Culture, Osaka Electro-Communication University |
| Date | 2004/8/13 |
| Paper # | US2004-38 |
| Volume (vol) | vol.104 |
| Number (no) | 254 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |