Journal article
Coherence propagation and geometric acoustics
The Journal of the Acoustical Society of America, Vol.79(3), pp.635-643
03/01/1986
DOI: 10.1121/1.393453
Abstract
In this work, the method of propagating the mutual coherence function through a deterministic environment using geometric acoustic Green’s functions is shown. It is also demonstrated how WKB Green’s functions for the acoustic field result in the locally quadratic approximation for the coherence function. Next, it is shown that an exact channel function can be constructed which smooths, or filters, the locally quadratic approximation and results in the exact mutual coherence function in a range-independent environment. Calculating the coherence function with WKB Green’s functions reveals multipath interference which is not properly accounted for by the locally quadratic radiative transport equation. When multipaths coalesce to form a smooth caustic, extensions of the locally quadratic transport equation give correct results only because interfering rays sample only a limited part of space. In the case of smooth caustics, it is shown that the coherence function as calculated from geometric acoustics agrees in detail with recently derived results for the coherence function which are based on the extended transport equation.
Details
- Title: Subtitle
- Coherence propagation and geometric acoustics
- Creators
- David H. Berman - United States Naval Research LaboratoryJohn J. McCoy - Catholic University of America
- Resource Type
- Journal article
- Publication Details
- The Journal of the Acoustical Society of America, Vol.79(3), pp.635-643
- DOI
- 10.1121/1.393453
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Language
- English
- Date published
- 03/01/1986
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627196302771
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