Abstract
This paper measures the electromechanical coupling characteristics of a conetype Langevin piezoceramic (PZT) vibrator operating near the resonant frequency. Using a steel ball, an elastic‐bouncing tester is built to observe the dynamic behaviors of an ultrasonic levitation force, which greatly improves our understanding of said levitation phenomenon. The steel ball's bouncing height variation, measured by our proposed experiment system, is much more apparent than the vibration amplitude of the vibrator. The relationship between the electromechanical coupling and the levitation characteristics of a vibrator is modeled with a coefficient of elastic‐bouncing, edyn , by integrating the impact theory with the restitution coefficient. The measurement instrument is implemented by use of a microprocessor, and the matrix photointerrupters are developed to determine the dynamic characteristics of a Langevin vibrator, particularly based on the steel ball bouncing behavior.
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