An investigation of magneto-acoustic effects in conductive fluids.
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Authors
Klaus, Robert Franz
Subjects
magneto-acoustics
sonomagnetic
sonomagnetic
Advisors
Moose, Paul H.
Date of Issue
1979-12
Date
December 1979
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
An acoustic wave propagating in a conductive medium in the
presence of a magnetic field will induce electric potential
fields and currents, and, associated with the electric currents,
secondary magnetic fields. This interaction is of
interest because it occurs in acoustic propagation through
sea water in the presence of the earth's magnetic field, and
at ultra-low frequency (ULF) , acoustic waves should be detectable.
A Green's function solution in an infinite medium is
developed, with an infinite magnetic field and an infinite
plane acoustic wave, from which it can be seen that the
magneto-acoustic coupling strength varies linearly with the
strength of the acoustic wave and with the magnetic field,
and is inversely proportional to frequency. An experiment is
described and analyzed in which this interaction is verified
for a specific laboratory geometry to within an order of
magnitude. Possible sources of the discrepancy in the magnitude
of the effect are discussed, and some potential refinements
for future experimentation are also noted.
Type
Thesis
Description
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funding
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.