I have a piezoelectric sensor that I would like to use as a force sensor. Some rudimentary testing with it tells me that it is outputting voltages in the range of 0-120V VPP, possibly more (I haven't tested it all the way but the manufacturer tells me that it will output up to 150VRMS). A big issue here is a lack of information provided by the manufacturer (They don't really want to tell me more about the sensor)
I would like to use the readings from this force sensor as input to an ADC that is capable of handling 0-5V.
Some reading that I did seems to indicate that the following are possibilities that I can do:
- Voltage divider with op-amp buffer
- Voltage divider with op-amp buffer and a diode to clamp negative voltages
My question with regards to these two are: What type of opamp am I looking for for either one? These signals are very fast and seem to disperse very quickly. My issue with the diode to clamp negative voltages is that I don't see why this is necessary -- wouldn't you just treat one side of the piezo as COM and then the op amp would only see the peak to peak voltage?
My apologies if this sounds a bit rambling, I am rather new to electronics and do not quite understand how this works.
In addition, I would like to ask what op-amp would be good for this purpose?