Reciprocity calibration of an underwater transducer using the Delta-Z Method.
Baker, Steven R.
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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.
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