| Autor: |
Mikeska, E. E., Shooter, I. A. |
| Zdroj: |
Journal of the Acoustical Society of America; 1981, Vol. 69 Issue S1, pS61-S61, 1p |
| Abstrakt: |
An upward looking 11-in. circular piston source in water was used to obtain a series of pressure measurements in air and water for the frequency range of 15-40 kHz. Transmission across the air-water interface showed the expected loss of 65.4 dB ± 0.5 dB for local conditions of temperature and barometric pressure. Horizontal scans across the acoustic axis showed that the beam pattern of the circular piston could be faithfully reproduced in air as well as in water. However, measurements along the acoustic axis in air departed significantly from the predictions of geometric acoustics. These results will be compared with a numerical solution of the Helmholtz equation for a distribution of sources along the surface of the water. [Work Supported by Office of Naval Research.] [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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