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- W2039714908 abstract "The acoustic beam of a circular plane piston (radius a) is analyzed as it approaches either the short-wavelength limit (SWL) or the large-radius limit (LRL). Using a new expression for the beam, we show that with no absorption the SWL would be a cylindrically collimated beam, with radius a, of plane waves. If absorptive effects are minor, the chief deviations during approach to the SWL occur in two decreasing volumes, a horn-shaped paraxial region and a cylindrical shell of mean radius a. One consequence is that any second harmonic, self-generated in the beam, approaches its own SWL more rapidly than does the first harmonic. Approach to the LRL yields a known paradox: Even the piston's nearfield need not approach a uniform plane wave. We show that the presence of absorption does make the LRL a plane wave and that in the absence of absorption there is a valid reason for the paradox: The piston beam must have a unique axis of cylindrical symmetry; an unbounded plane wave cannot." @default.
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- W2039714908 date "1972-09-01" @default.
- W2039714908 modified "2023-09-23" @default.
- W2039714908 title "Acoustic Field of Circular Plane Piston in Limits of Short Wavelength or Large Radius" @default.
- W2039714908 doi "https://doi.org/10.1121/1.1913191" @default.
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