| Presentation | 2010-11-25 Nonlinearly propagating ultrasound beams in inhomogeneous media Tomoo KAMAKURA, Hideyuki NOMURA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A model equation that describes the nonlinear propagation of a directive ultrasound beam in inhomogeneous media is derived based on weak inhomogeneity and nonlinearity. The resultant beam equation is valid in the parabolic approximation and is the same form as a general equation when the nonlinearity is initially ignored. Pressure amplitude variations in the first three harmonics are numerically predicted for a 40-kHz finite-amplitude airborne CW propagating through an inhomogeneous region, where the speed of sound is different from the host medium. It has been shown that the second and more higher harmonic amplitudes are less sensitive to the inhomogeneity compared with hypothetically emitted linear beams with the same frequencies as the harmonics. Additionally, the temporal amplitude-fluctuation of a finite-amplitude tone-burst wave in a weak air flow is discussed from an experimental point of view. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | inhomogeneous medium / ultrasonic beam / nonlinear propagation |
| Paper # | US2010-83 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2010/11/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| 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) | Nonlinearly propagating ultrasound beams in inhomogeneous media |
| Sub Title (in English) | |
| Keyword(1) | inhomogeneous medium |
| Keyword(2) | ultrasonic beam |
| Keyword(3) | nonlinear propagation |
| 1st Author's Name | Tomoo KAMAKURA |
| 1st Author's Affiliation | The University of Electro-Communications() |
| 2nd Author's Name | Hideyuki NOMURA |
| 2nd Author's Affiliation | The University of Electro-Communications |
| Date | 2010-11-25 |
| Paper # | US2010-83 |
| Volume (vol) | vol.110 |
| Number (no) | 306 |
| Page | pp.pp.- |
| #Pages | 6 |
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