NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Intensity moments by path integral techniques for wave propagation through random media, with application to sound in the oceanA theory is developed which describes intensity moments for wave propagation through random media. It is shown using the path integral technique that these moments are significantly different from those of a Rayleigh distribution in certain asymptotic regions. The path integral approach is extended to inhomogeneous, anisotropic media possessing a strong deterministic velocity profile. The behavior of the corrections to Rayleigh statistics is examined, and it is shown that the important characteristics can be attributed to a local micropath focusing function. The correction factor gamma is a micropath focusing parameter defined in terms of medium fluctuations. The value of gamma is calculated for three ocean acoustic experiments, using internal waves as the medium fluctuations. It is found that all three experiments show excellent agreement as to the relative values of the intensity moments. The full curved ray is found to yield results that are significantly different from the straight-line approximations. It is noted that these methods are applicable to a variety of experimental situations, including atmospheric optics and radio waves through plasmas.
Document ID
19830059279
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bernstein, D. R.
(California, University Santa Cruz, CA, United States)
Dashen, R.
(Institute for Advanced Study Princeton, NJ, United States)
Flatte, S. M.
(California Univ. Santa Cruz, CA, United States)
Date Acquired
August 11, 2013
Publication Date
July 1, 1983
Publication Information
Publication: Physics of Fluids
Volume: 26
ISSN: 0031-9171
Subject Category
Physics (General)
Report/Patent Number
AD-A183100
Accession Number
83A40497
Funding Number(s)
CONTRACT_GRANT: E(11-1)-3070
CONTRACT_GRANT: NSG-1323
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available