J. Phys. Colloques
Volume 51, Numéro C2, Février 1990Premier Congrès Français d'Acoustique / First French Conference on Acoustics
|Page(s)||C2-1291 - C2-1294|
J. Phys. Colloques 51 (1990) C2-1291-C2-1294
RECIPROCITY CALIBRATION OF A SONAR TRANSDUCER FROM ELECTRICAL IMPEDANCE MEASUREMENTS IN WATER AND IN AIR : THE DELTA-Z RECIPROCITY CALIBRATION METHODS.R. BAKER, R. BEDARD, M.D. PATTON et O.B. WILSON
Code 61, Naval Postgraduate School, Monterey, CA 93943, U.S.A.
A method is described by which the free-field, open-circuit voltage sensitivity of a reversible underwater acoustic transducer may be obtained from measurements of its input electrical impedance in water and in air. This method, which we have termed the Delta-Z reciprocity calibration method, is being developed for the in-service calibration of sonar transducers installed in domes which can be flooded and purged. The application of the Delta-Z method to the calibration of a single tonpilz-type piezoelectric sonar transducer is described. The resulting sensitivity obtained using the Delta-Z method agrees within approximately one decibel with that obtained by a standard comparison calibration procedure over a two-octave frequency band about the nominal operating frequency of the transducer.