Piezo-electric materials and frequency in/dependence

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rperea

Joined Apr 7, 2009
15
Do piezo-electric materials have frequency dependance? Why and how? When they are compressed and the frequency they are compressed??
 
rperea said:
Why and how?
Answers are to be found in rare and expensive books and research papers. Piezo device modeling can be horribly complex.

They can be looked at in slightly simpler terms, say impedance and output displacement, in which case the characteristic graphs often look like a mountain range. This doesn't account for electromechanical feedback, drift, tempco, ageing etc, but is a good start to understanding piezo characteristics and their inherent self-resonant nature. So yes, they're very frequency dependent, and driving a piezo device at too high a frequency will fry it. Always refer to the piezo datasheet, as they're all different.
 
Last edited:

KL7AJ

Joined Nov 4, 2008
2,225
Piezo materials can range from materials where the Q is so low as to be irrelevant (such as bone and Rochelle Salts), to materials where the Q is all-important, such as quartz crystals, and may approach values of 100,000 or more.

Resonance, therefore, is often associated with piezo materials, but not necessarily so. A Piezo material is any material that generates and electric potential under stress.

Hope this helps.

eric
 
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