Abstract
A method of tuning ultrasonic transducers by using the admittance of the transducer as the tuning parameter rather than the phase angle. The admittance magnitude of a transducer is not related to the phase angle and thus, using the admittance of the transducer as the tuning parameter allows tuning over a broad bandwidth. In addition, transducer performance can be normalized against the variation in admittance magnitude and frequency location of the series and parallel resonance points by quantifying these variations and continually adjusting the operational set point as a function of transducer drive voltage during transducer operation.
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