| Presentation | 2023-05-18 Structural optimization of the first parabolic reflector of DPLUS Shoki Ieiri, KyoHei Yamada, Chen Kang, Takeshi Morita, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A high-frequency ultrasonic transducer with focusing mechanism using two parabolic surfaces (DPLUS) is structurally optimized in terms of focal length while keeping the focus point of the first parabolic structure fixed. As a result of the finite element analysis, we found that there exists a trade-off relationship between energy loss due to longitudinal and transverse mode conversion and diffusion loss depending on the path length, and obtained the optimal structure. The obtained optimal structure is expected to have an energy density about 1.6 times higher than the current one at the focal point. Furthermore, we have shown the possibility of introducing high-intensity ultrasonic waves with an energy line density about three times higher than that of the conventional DPLUS by inserting a slit at the root of the thin rod waveguide for the optimum structure. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | DPLUS / acoustic waveguide / high-intensity ultrasound / finite element analysis |
| Paper # | US2023-6 |
| Date of Issue | 2023-05-11 (US) |
| Conference Information | |
| Committee | US |
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| Conference Date | 2023/5/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Surugadai Campus, Nihon University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Nonlinear acoustics, Ultrasonics, etc. |
| Chair | Kentaro Nakamura(Tokyo Inst. of Tech.) |
| Vice Chair | Yoshikazu Koike(Shibaura Inst. of Tech.) / Yasuaki Watanabe(Tokyo Metropolitan Univ.) |
| Secretary | Yoshikazu Koike(Tohoku Univ.) / Yasuaki Watanabe(Chiba Univ.) |
| Assistant | Kan Okubo(Tokyo Metropolitan Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Ultrasonics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Structural optimization of the first parabolic reflector of DPLUS |
| Sub Title (in English) | |
| Keyword(1) | DPLUS |
| Keyword(2) | acoustic waveguide |
| Keyword(3) | high-intensity ultrasound |
| Keyword(4) | finite element analysis |
| 1st Author's Name | Shoki Ieiri |
| 1st Author's Affiliation | The University of Tokyo(The Univ. of Tokyo) |
| 2nd Author's Name | KyoHei Yamada |
| 2nd Author's Affiliation | The University of Tokyo(The Univ. of Tokyo) |
| 3rd Author's Name | Chen Kang |
| 3rd Author's Affiliation | The University of Tokyo(The Univ. of Tokyo) |
| 4th Author's Name | Takeshi Morita |
| 4th Author's Affiliation | The University of Tokyo(The Univ. of Tokyo) |
| Date | 2023-05-18 |
| Paper # | US2023-6 |
| Volume (vol) | vol.123 |
| Number (no) | US-36 |
| Page | pp.pp.28-32(US), |
| #Pages | 5 |
| Date of Issue | 2023-05-11 (US) |