Reciprocity calibration of an underwater transducer using the Delta-Z Method.
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Authors
Bedard, Raynald
Subjects
NA
Transducer calibration
Reciprocity calibration
In-situ SONAR calibration
Delta-Z method
Transducer calibration
Reciprocity calibration
In-situ SONAR calibration
Delta-Z method
Advisors
Baker, Steven R.
Date of Issue
1987
Date
December 1987
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
a method for determining the free-field open circuit voltage sensitivity of a reversible underwater electroacoustic transducer from the difference in its input electrical impedance when loaded by water and air was investigated theoretically and experimentally. An equation for the sensitivity was derived using reciprocal two-port network theory. The theory takes into account the diffraction due to the finite size of the transducer, its finite mechanical impedance, and its free-field radiation impedance in water, An experiment to test the predictions of the theory was performed using a 6" diameter, hollow, piezoelectric ceramic spherical transducer. The result of the experiment agreed within several dB with a standard comparison calibration over the frequency range for which both the electrical impedance and comparison calibration data are considered reliable. The calibration method described, which has been termed the Delta-Z method, may be useful for in-situ monitoring of transducer sensitivity in installations which can be flooded and purged.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics Academic Committee
Department of Electrical and Computer Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
NA
Format
64 p. 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner