Wednesday, June 29, 2011

CrazyEngineers Forum - Other Engineering Trades

CrazyEngineers Forum - Other Engineering Trades

Understanding piezoelectric power formulas for a square wave pulse

Posted: 28 Jun 2011 05:49 PM PDT

I'm coming from a geology standpoint here, so bear with me...my goal is to measure some of the physical characteristicsof various earth materials (sands, gravels, clays, etc.) by pulsing a piezoelement into one end of a 3” diameter cylinder of material sample, andmeasuring the reaction (attenuation of the signal) at the other end (with a second piezo). The firststep is to set up the single piezo element that will be providing thepulses.

For the sake of developing my understanding of the formulas/calculations involved, let's say I'm using a 3" diameter / 0.02" thick quartz piezo (they are used as SAW wafers and the characteristics are readily available).

Given the physical dimensions and a number of electrical characteristics (resonance frequency = 3MHz, breakdown voltage~4kV, capacitance=300pF) of the piezo and, driving it with a positive square wave pulse - say 1kHz, 100VDC pulse, 50% duty cycle:

How do I calculate the maximum frequency vs. voltage vs. current that it can withstand without breaking down ?
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