Development of four-element end-fire array as seismo-acoustic sonar source
Authors
Rumph, Steven E.
Subjects
Seismic SONAR
Seismo-Acoustic
Landmine Detection
Seismic Waves
End-Fire Array
Seismo-Acoustic
Landmine Detection
Seismic Waves
End-Fire Array
Advisors
Baker, Steven R.
Muir, Thomas G.
Date of Issue
2003-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Because the inherent dangers of buried mines still possess the ability to deny or severely limit the projection of naval forces ashore, continued research and development of landmine detection capabilities is paramount. One promising method for buried mine detection, still in the early development stages, is the use of Seismo-Acoustic waves for target echo location. he goal of the research described in this thesis was to design and develop a four-element end-fire array to be used as a Seismo-Acoustic SONAR source to preferentially excite Rayleigh waves. A four-element end-fire array, consisting of four vertical-motion inertial mass shakers spaced 25 cm apart (approximately one-quarter wavelength), was deployed on the sand in the near-surf zone of Del Monte Beach. The beam of the array was directed to end-fire by using a delay/pulse generator to individually trigger four function generators. Testing at the beach was conducted and results have shown nice end-fire beam patterns at a radius of 3.5 meters with approximately 15 dB suppression to the rear of the array relative to the forward direction.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics
Engineering Acoustics Academic Committee
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
xiv, 91 p. : ill. (some col.) ;
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.