| Autor: |
Bennett, Mary Beth, Slack, Charles M. |
| Zdroj: |
Journal of the Acoustical Society of America; 1978, Vol. 63 Issue 2, p339-345, 7p |
| Abstrakt: |
A transducer capable of penetrating marine sediments with multiple, rectangular beams which are broad (20°-30°) in one plane and narrow (2°-3°) in the other plane at frequencies of 10-20 kHz was desired. Transducer size constraints prohibited attaining such a beam conventionally; thus, parametric operation of a rectangular transducer was examined. A relatively high parametric source level of 190 dB re 1 μPa at 1 m was also desired, and the resulting cavitation and acoustic intensity considerations dictated a curved-face transducer design. Primary and parametric beam patterns and propagation data obtained for both a rectangular transducer and a curved-face transducer confirmed the prediction techniques being employed. Parametric beam patterns in the broad plane exhibited minor lobes with the minor-lobe structure of the curved-face transducer beam less pronounced than that experienced with the rectangular transducer. Sound pressure levels and beam patterns measured for the curved-face projector confirmed that a curved-face transducer can be operated parametrically to produce high-power, low-frequency rectangular beams. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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