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J. Appl. Phys. 42, 2168 (1971); http://dx.doi.org/10.1063/1.1660521 (13 pages)
Experimental Hydroacoustic Imaging System
(Received 14 September 1970)
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Add to FacebookAn underwater acoustic imaging system is described which has been developed especially for close‐range, high‐resolution (on the order of millimeters) viewing in very turbid water. The system operates at nominal 2.5‐MHz frequency and has a range up to 10 m in water of suspended ocean sediment concentration as high as several thousand parts per million. Larger range capability is possible with lower sediment concentration. Real‐time kinescope displays are presented by the system of the acoustic field of view, which is that insonified by a high‐intensity sound transmitter of total beamwidth variable up to 30° in 10° increments. The sensitive (better than 10−10 W∕cm2) piezoelectric image converter is augmented by a mechanical scanning system to provide in effect a 10 000‐element pickup matrix. A Plexiglas lens moved by remote‐control drive is employed for focusing. System parameters and performance are discussed, and some typical hydroacoustic images are displayed.
© 1971 The American Institute of Physics
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M. Auberger and J. S. Rinehart, J. Appl. Phys. 32, 219 (1961)JAPIAU000032000002000219000001.
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