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- W1972502110 abstract "This paper investigates the effects of placing a rubber cylinder between the pump and receiving transducers in an otherwise conventional parametric receiver. The use of this rubber cylinder is experimentally found to increase parametric conversion gain by 20 to 24 dB, while simultaneously reducing beam width by a factor of two to three. These improvements are relative to the same pump-receiver separation distance (0.23 m) in water alone, over the experimental frequency range of 4.8 to 23 kHz. A theoretical model of this configuration is developed, using the numerical solution of the system of equations obtained by coupling the interior surface Helmholtz equation to the integral equation for the exterior of the cylinder. The resulting calculated beam patterns and efficiency levels are found to be in very good agreemnt with the data collected. Using this model, the observed efficincy improvement is found to be largely due to the slow speed of sound in this rubber (1018 m/s) as compared to water, while the directivity improvement is , to a significant extent, due to the acoustic slow-waveguide effect." @default.
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- W1972502110 date "1979-09-01" @default.
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- W1972502110 title "Compact parametric hydrophone using nonlinear interaction within a cylindrical rubber waveguide" @default.
- W1972502110 doi "https://doi.org/10.1121/1.383244" @default.
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