Approved for public release; distribution unlimited. / Sound of constant amplitude and frequency was transmitted
simultaneously in three orthogonal beams over a
distance of 1.5 meters in the upper ocean. Time records
of the resulting phase and amplitude fluctuations of the
sound beams were studied by means of auto and cross spectral
analysis and correlation. The time lag between corresponding
peaks of the phase fluctuation autocorrelation functions
of vertical and horizontal beams indicate movement of inhomogeneities
between the sound fields due to water particle
motion caused by surface wave action. Envelope correlation
times of the phase fluctuations are found to be approximately
one-half as great in the mixed layer as in the thermocline,
and are greater in the vertical than in the horizontal direction in the thermocline. Anisotropy in the thermocline
is also indicated by the variance of phase fluctuation
being greater for sound paths in the horizontal than in the
vertical direction. The autocorrelation functions of
amplitude and phase fluctuations in any one direction are
similar.
| Identifer | oai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/16356 |
| Date | 12 1900 |
| Creators | Alexander, Charles Homer |
| Contributors | Medwin, H., Thornton, Edward B., Naval Postgraduate School, Naval Postgraduate School |
| Publisher | Monterey, California : Naval Postgraduate School |
| Source Sets | Naval Postgraduate School |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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