The resonance frequencies on mechanically pre-stressed ultrasonic piezotransducers |
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Authors: | Arnold F J Mühlen S S |
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Institution: | Superior Center of Technology Education, Campinas State University, Limeira, SP, Brazil. arnold@claretianas.com.br |
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Abstract: | The piezotransducers employed in high power ultrasound are composed of piezoelectric ceramics and metallic pieces. These transducers are mechanically pre-stressed in order to avoid the ceramic fractures when high voltage is applied under resonance. The resonance and anti-resonance frequencies are shifted depending on the level of applied mechanical pre-stressing. This paper discusses some causes of this shifting on a experimental study. The discussion takes into account the variations on characteristic parameters of the ceramics and the acoustic coupling between parts of the transducer. |
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