Computerized measurement and tracking of acoustical resonances.
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Authors
Conte, Donald Vincent.
Subjects
Advisors
Garrett, S.L.
Date of Issue
1982-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A system is described which incorporated a Hewlett-Packard
85 "desk-toe" computer to control a frequency synthesizer
and read the output of a lock-in analyzer to measure,
display and record the resonant frequencies, amplitudes, and
quality factors of several modes of an acoustical resonator.
The system is capable of locating, measuring, and tracking
the resonant modes as parameters which affect sound speed and attenuation are varied. An algorithm for rapidly
fitting "good quality" measured data to a resonance lineshape is described which determines quality factors to
precisions cf better than 9.1 percent, amplitudes to better
than 0.01 percent ind center frequencies to better than
0.01 ppm. Sample output is provided for the lowest three
plane wave modes of a n air filled cylindrical resonator in
the temperature range of -15 to 25 degrees Celsius.
Type
Thesis
Description
Series/Report No
Department
Physics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.