How to amplify voltage signal resulted by piezoelectric?

[bauketek]

Hi,
I am not very good at electronic circuit,,
I just want to ask:
How to amplify voltage signal resulted by piezoelectric?
Since the voltage resulted by this material is very small,,
thank you for any help

 

[berkeman]

Hi,
I am not very good at electronic circuit,,
I just want to ask:
How to amplify voltage signal resulted by piezoelectric?
Since the voltage resulted by this material is very small,,
thank you for any help

Welcome to the PF.

We need more information in order to help you. What piezo sensor are you using? What are you sensing? Can you post a link to the datasheet for this sensor?

You would normally use a transistor and/or opamp circuit to do the signal amplification. What is the context of your question? What is the application? Is this for school, work, or hobby?

 

[bauketek]

thank you for replying,,
Actually, I am an undergraduate student majoring in physics,,
I have a project with my professor which is making the piezoelectric materials (so we make them, not buy them).
But, I have problems in measuring the voltage,,
since I don't have the datasheet, therefore,
what should I find first in order to make an appropriate amplifier?
Is there any method to do that?

Thank you

 

[sophiecentaur]

Your professor should be able to give you a clue (or even your notes!?) about the voltage you could expect. It would not be good to embark on a circuit design before considering what amplification / frequency response / noise performance you would need. It could be a trivial thing or a very complicated measurement.

 

[Studiot]

In the piezoelectric effect mechanical effort is converted to voltage.

This voltage can be very high (as in spark generators 1) or it can be more modest (as in vibration transducers 2).

Whatever the current that the piezo material can supply is very small indeed.

This is another way of saying that the voltage output of the piezo sample has to be fed into an electronic device with a very very high input impedance. This usually requires special circuitry.

Berkeman is correct in asking about the circumstances of the measurement.

Are you trying to obtain impulsive voltage on a scope or are you looking for a continuous voltage output or what?
How are you making electrical connection to the material to observe this output voltage?

 

[skeptic2]

You will need a very high impedance to detect the voltage. Probably the easiest way do that is with an opamp that uses mos-fets in the front end. This is the data sheet for one. http://www.intersil.com/data/fn/fn957.pdf

 

[0xDEADBEEF]

Can you oscillate the piezo? You will usually need some kind of "charge amplifier" (look it up). But these only work well when the signal changes with time.

 

[KingNothing]

You need an amplifier with a high impedance. If you want some quick answers, search for i instrumentation amplifiers.

Something like this: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=296-15093-5-ND
should do the job. You'll want to put this in-line with a basic op-amp follower circuit before reading it's output.

 

[Proton Soup]

You need an amplifier with a high impedance. If you want some quick answers, search for i instrumentation amplifiers.

Something like this: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=296-15093-5-ND
should do the job. You'll want to put this in-line with a basic op-amp follower circuit before reading it's output.

i think that'll be OK without buffering the output. might want to order several up front to account for the typical experimenter errors, though.

of course, the thing he doesn't mention is frequency, which might become problematic if too much gain is required.

 

[ranab]

hey it's nothin much complicated just connect your change in resistance of the piezo material to the wheatstone bridge i.e make it one of the resistances and by varying the other resistance values note down the current. This small voltage produced is given to the operational amplifier so we get the voltage of higher values

 

[Integral]

This thread is 2yrs old, the OP has not been active in 6mos.

Locked.