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The following document describes signal conditioning circuits for Piezeoelectric sensors. I was interested in knowing which model should I use when designing signal conditioning circuit for piezelectric sensor.

http://www.ti.com/lit/an/sloa033a/sloa033a.pdf

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2 Answers 2

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If you can limit the load capacitance of the cable and amplifier, you can use the voltage model. This requires that no cable is involved as cables tend to add 20~30 pF/ft.

Otherwise the charge model must be used and a charge amplifier is required. This is how accelerometers work with cables from sensor to amp.

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Could you provides more information, in class they said that you have to use it based on the natural frequency of the piezoelectric sensor. Sorry I wouldn't have to be asking here if the prof provided proper lectures notes. –  Anonymous Nov 27 '12 at 0:39

You can find some advantages and disadvantages of the approaches here:

Piezoelectric transducers - Endevco Tech Paper

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