| Presentation | 2008-08-29 Theoretical prediction of the sound field focused by an acoustic lens Hiromu SHIGA, Hideyuki NOMURA, Tomoo KAMAKURA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Using wave theory, we examined the influences of characteristic impedance, absorption coefficients of longitudinal and share waves in an acoustic lens on focusing field. When the medium density of the lens is changed, the focusing gain is in good agreement with the results predicted by the characteristic impedance. When the longitudinal wave absorption coefficient is changed, and the lens is assumed to be planar, the thickness of the lens agrees roughtly with one predicted by geometry. Additionally, the theory demonstrates that the longitudinal wave absorption coefficients have a great influence on the gain. Whereas the absorption coefficient of the share wave does not affect on the focused field. As another theoretical prediction for lens performance in place of the wave theory, the basic idea of the FDTD method is proposed. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | acoustic lens / wave theory / FDTD method |
| Paper # | US2008-27 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2008/8/22(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| 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) | Theoretical prediction of the sound field focused by an acoustic lens |
| Sub Title (in English) | |
| Keyword(1) | acoustic lens |
| Keyword(2) | wave theory |
| Keyword(3) | FDTD method |
| 1st Author's Name | Hiromu SHIGA |
| 1st Author's Affiliation | The University of Electro-Communications() |
| 2nd Author's Name | Hideyuki NOMURA |
| 2nd Author's Affiliation | The University of Electro-Communications |
| 3rd Author's Name | Tomoo KAMAKURA |
| 3rd Author's Affiliation | The University of Electro-Communications |
| Date | 2008-08-29 |
| Paper # | US2008-27 |
| Volume (vol) | vol.108 |
| Number (no) | 196 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |