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An a priori theoretical model for electrostatic airborne ultrasonic transducers has been developed. The historical development of transducer modeling is briefly reviewed. This paper applies the plate-on-air-spring model to establish a mathematical formulation for the transducer behavior in terms of the characterized impedance parameters. It is clarified that such an electrostatic transducer is a capacitive-type device and obeys the reciprocity principle in the same way as a piezoelectric device. The accurate prediction of multiple resonant frequencies and transmitting responses for a typical V-grooved backplate transducer serve to substantiate the theoretical model.
Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on (Volume:46 , Issue: 5 )
Date of Publication: Sept. 1999