Development and calibration of two and four wire water surface wave height measurement systems.
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Authors
Yarber, Robert K.
Subjects
calibration
capacitance
conductance
four wire
gravity wave
power spectrum
surface wave height
two wire
wind-wave
capacitance
conductance
four wire
gravity wave
power spectrum
surface wave height
two wire
wind-wave
Advisors
Keolian, Robert M.
Garrett, Steven L.
Date of Issue
1992-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Capacitance and conductance measurements using two and
four wire techniques were developed and statically and
dynamically calibrated in this thesis. The voltage
sensitivities range from 7.3 to 8.1 ± 0.1 mV/cm for the two
wire capacitance system static calibrations. This is ± 5.2%
of the limiting theoretical value. The voltage sensitivities
range from 0.3 to 0.4 ± 0.1 V/cm for the four wire
conductance system static calibrations. Dynamic calibrations
were only completed for the conductance system. The dynamic
calibration results were weakly frequency dependent with a
qj-0.15 decay in a limited, 2-4 Hz range. Wind power spectrum measurements were taken in the
existing Upper Ocean Simulations Facility at the Naval
Postgraduate School. There was excellent agreement in the
spectra with both techniques.
Driven gravity wave frequency downshifting and wind
energy dumping was observed in the combined gravity wave and
wind-wave measurements. The power spectra peaked near two
Hertz and decayed at 50 to 70 dB per decade, or as CO
-5 to
G)" 7 for both systems. Gravity wave phase speed and wavelength measurements
were performed with the capacitance system. The results were
approximately 40% higher than theory.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
116 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.