Abstract:
A new type of high intensity piezoelectric ultrasonic transducer is presented. The transducer is composed of two traditional longitudinally sandwiched piezoelectric transducers, which are connected together in series mechanically and in parallel electrically. Based on the analytical method, the electromechanical equivalent circuit is derived and the resonance/anti-resonance frequency equations are obtained. The impedance characteristics and the vibrational modes of the transducer are analyzed. The dependency of the resonance/anti-resonance frequency and the effective electromechanical coupling coefficient on the distance between two piezoelectric stacks are studied. Two prototypes of the transducers are designed and made, and the resonance/anti-resonance frequency is measured. It is shown that the analytical resonance/anti-resonance frequencies are in good agreement with the experimental results. It is expected that this kind of transducer can be used in large power and high intensity ultrasonic applications, such as ultrasonic liquid processing, ultrasonic metal machining and ultrasonic welding and soldering.
