| Presentation | 2006/8/18 Basic Study of FDTD Analysis for Phase Continuous Fresnel Lens Kazuyoshi MORI, Ayano MIYAZAKI, Hanako OGASAWARA, Toshiaki NAKAMURA, Yasuhito TAKEUCHI, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The convex lens using RTV silicone rubber, which acoustic impedance matches that of water well, is one of typical acoustic lenses. However, some consideration is needed to reduce the thickness of lens because the attenuation is very large in RTV silicone rubber. Therefore, the phase continuous Fresnel lens was proposed which has some devices keeping the phase continuous in the whole lens aperture without incoherent convergence. This lens is made by removing its thickness like staircase shape in which the difference of each step is an integer multiple of the wave length. In this report, the sound fields focused by a phase continuous Fresnel lens are analyzed using Finite Difference Time Domain (FDTD) method. The sound pressure field of focal region is surveyed by changing the burst pulse length and angle of incidence. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Acoustic Lens / Focusing Characteristics / Phase Continuous Fresnel Lens / RTV Silicone Rubber / FDTD Method |
| Paper # | US2006-34 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2006/8/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| 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) | Basic Study of FDTD Analysis for Phase Continuous Fresnel Lens |
| Sub Title (in English) | |
| Keyword(1) | Acoustic Lens |
| Keyword(2) | Focusing Characteristics |
| Keyword(3) | Phase Continuous Fresnel Lens |
| Keyword(4) | RTV Silicone Rubber |
| Keyword(5) | FDTD Method |
| 1st Author's Name | Kazuyoshi MORI |
| 1st Author's Affiliation | Department of Earth and Ocean Sciences, National Defense Academy() |
| 2nd Author's Name | Ayano MIYAZAKI |
| 2nd Author's Affiliation | Graduate School of Science and Engineering, National Defense Academy |
| 3rd Author's Name | Hanako OGASAWARA |
| 3rd Author's Affiliation | Department of Earth and Ocean Sciences, National Defense Academy |
| 4th Author's Name | Toshiaki NAKAMURA |
| 4th Author's Affiliation | Department of Earth and Ocean Sciences, National Defense Academy |
| 5th Author's Name | Yasuhito TAKEUCHI |
| 5th Author's Affiliation | Department of Information Engineering, Faculty of Engineering, Kagoshima University |
| Date | 2006/8/18 |
| Paper # | US2006-34 |
| Volume (vol) | vol.106 |
| Number (no) | 216 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |