THE EFFECT OF GEOMETRY ON THE DISPLACEMENT AMPLIFICATION AND RESONANCE CHARACTERISTICS OF THE CYMBAL TRANSDUCERS

摘要

The cymbal transducer, consists of an inner P-5 piezoelectric disk mechanically coupled to two thin brass end caps on each of its electrode faces by Eccobond epoxy. Based on previous studies of cymbal transducers, the displacement amplification and the properties of resonance of the cymbal were elevated by optimizing the fabrication technique. Several kinds of end caps were designed for the cymbals to study their performances based on the cavity depth and caps thickness. They showed more than 14x to 38x amplification over the uncapped ceramic alone under the direct current (DC) mode. The calculated effective piezoelectric charge coefficient of the cymbal reached to 22550 pm/V. The cymbals also showed the first resonance frequency from 28.54 kHz to 58.53 kHz.