Publication:
A preliminary investigation of acoustic energy transmission from a tapered fluid layer into a fast bottom

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Authors
Edwards, James Nathaniel, Jr.
Subjects
acoustic waveguide
sound propagation in a tapered fluid layer
shallow water acoustic propagation
two layered acoustic model
Advisors
Coppens, Alan B.
Date of Issue
1976-12
Date
December 1976
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The transmission of acoustic energy from a tapered fluid layer into an underlying layer of fluid was investigated. Pulsed transmissions at frequencies of 75.85 kHz and 107.5 kHz were used to insonify the upper layer while a small probe transducer was used to measure signal amplitude variation with depth in the lower layer. The experimental data collected indicate that a directional transmission of acoustical energy into the lower layer occurs over regions corresponding to the individual cutoff depths for normal modes in the upper layer. A simple method for estimating the position of these regions is discussed and the effects of frequency and upper layer slope variations are reported.
Type
Thesis
Description
Series/Report No
Department
Physics and Chemistry
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
NPS-33-JE76121
Sponsors
Naval Undersea Center, project number N6600177P000020
Funder
Naval Undersea Center, project number N6600177P000020
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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