Abstract
This paper examines the effects of placing a silicone rubber cylinder between the pump and receiving hydrophone in a parametric receiver configuration. The use of this rubber cylinder is found to considerably reduce the required pump-receiving-hydrophone separation distance, as compared with that required for comparable beamwidths in a water medium alone. This improvement in directivity is related to the low sound speed in silicone rubber (∼1000 m/s), which allows the rubber cylinder to act as a slow acoustic waveguide antenna. At the same time, the parametric conversion efficiency of the array is significantly increased, due to both, the low sound speed and high nonlinearity parameter (B/A∼8) of this rubber. These observations are consistent with those of a previous study [J. D. Ryder, P. H. Rogers, and J. Jarzynski, J. Acoust. Soc. Am. 56, S42(A) (1964), and in press], where the same rubber cylinder was used in a parametric transmitter configuration.
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