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- W2037960411 abstract "An acoustic parametric source was mounted underwater in such a way that its axis could be aimed horizontally or at some angle of elevation, heading upward to the surface above. Free-field measurement of the radiation pattern showed the typical absence of side lobes in the difference-frequency beam. However, reflection of the beam by a calm water-air surface caused severe broadening of the beam and reduction of the sound pressure level at the difference frequency, as compared with the direct path signal from source to hydrophone. Measurements of the received signal as a function of horizontal range and of azimuthal angle are presented. The parametric source was a USRD Type E8 transducer. It and the receiving hydrophone were located at the same depth of 0.47 m. The reflecting surface was located within the nearfield of the parametric source, and the beam disruption is attributed to phase reversal that occurs upon reflection. The results are consistent with results presented by Mellenbruch and Muir at the 86th Meeting of the Acoustical Society of America [J. Acoust. Soc. Am. 55, 429(A) (1974)]." @default.
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- W2037960411 date "1974-04-01" @default.
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- W2037960411 title "Surface reflection of an underwater acoustic parametric source" @default.
- W2037960411 doi "https://doi.org/10.1121/1.1919609" @default.
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