| Presentation | 2009-01-29 Characteristics of frequency and incident angle of convergence field by aspherical acoustic lens for developing underwater acoustic imaging sonar system Sayuri MATSUMOTO, Yuichi SHIN, Fumitaka NAITO, Takenobu TSUCHIYA, Norihide TAKEYAMA, Nobuyuki ENDOH, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | One of the authors has been developing aspherical acoustic lenses for an underwater acoustic imaging sonar system. The sonar system makes images by using Frequency sweep method, and then to improve the lens performance we need to measure frequency and incident angle dependency characteristics of aspherical acoustic lens. Because under Frequency sweep method an acoustic beam has only one frequency at each irradiation angle. In this study, we reported characteristics of frequency and incident angle for Len B, which we have estimated basic characteristics before. Measuring conditions were 0.5, 0.7, 1.0MHz at a source frequency and 0.0°, 4.0° and 8.0° at a incident angle into the lens, respectively. Measured convergence point and its beam width were compared with simulated results, which were obtained by FDTD method. As a result, it is shown that calculated results were good agreement with measured results. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | acoustic lens / acoustic imaging system / convergence field / characteristics of incident angle and frequency |
| Paper # | US2008-80,EA2008-122 |
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| Conference Information | |
| Committee | EA |
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| Conference Date | 2009/1/22(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 | Engineering Acoustics (EA) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Characteristics of frequency and incident angle of convergence field by aspherical acoustic lens for developing underwater acoustic imaging sonar system |
| Sub Title (in English) | |
| Keyword(1) | acoustic lens |
| Keyword(2) | acoustic imaging system |
| Keyword(3) | convergence field |
| Keyword(4) | characteristics of incident angle and frequency |
| 1st Author's Name | Sayuri MATSUMOTO |
| 1st Author's Affiliation | Port and Airport Research Institute() |
| 2nd Author's Name | Yuichi SHIN |
| 2nd Author's Affiliation | Faculty of Engineering, Kanagawa University |
| 3rd Author's Name | Fumitaka NAITO |
| 3rd Author's Affiliation | Faculty of Engineering, Kanagawa University |
| 4th Author's Name | Takenobu TSUCHIYA |
| 4th Author's Affiliation | Faculty of Engineering, Kanagawa University |
| 5th Author's Name | Norihide TAKEYAMA |
| 5th Author's Affiliation | Genesia |
| 6th Author's Name | Nobuyuki ENDOH |
| 6th Author's Affiliation | Faculty of Engineering, Kanagawa University |
| Date | 2009-01-29 |
| Paper # | US2008-80,EA2008-122 |
| Volume (vol) | vol.108 |
| Number (no) | 411 |
| Page | pp.pp.- |
| #Pages | 6 |
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