Hi everyone,
I am trying to place Piezoelectric ceramic patch as strain sensor for substrate structural element. I am confused about the components of the conditioning circuit needed to measure voltage signal induced in the sensor due to harmonic mechanical strain affecting substrate structure . I would be so appreciated if any one illustrated this circuit to me with schematic drawing or pictures from lab setting.
Regards
This article may help.
TechNote: Charge vs Voltage mode Piezoelectric Sensors
https://www.technimeasure.co.uk/technote-charge-vs-voltage-mode-piezoelectric-sensors/
Also, one may have a look at https://www.allaboutcircuits.com/technical-articles/processing-a-piezoelectric-accelerometer-output-using-a-charge-amplifier/
Hello Nikolay Pavlov ,
I am thankful for your help , but I am looking for voltage amplifier
Regards
Why would you prefer a voltage amplifier? The output voltage depends on the total capacitance (incl. connecting cable), because voltage = charge/capacitance.
Of course you can do this, but it depends on the frequency you want to measure. The voltage amplifier must have the highest possible input resistance, which is usually achieved by a JFET or MOSFET input. This is because the voltage measurement has an additional disadvantage compared to the charge amplifier: The total capacitance C of the piezo and the cable, together with the input resistance R, form a high-pass filter with a time constant T=R*C.
This means that you can only measure frequencies that are significantly above (10x) the cut-off frequency.
You can find further explanations on my website:
https://www.f3lix-tutorial.com/signal-electronics
or
https://www.f3lix-tutorial.com/piezo-constants
Hello, Felix Schmid ,
I will discuss modification of experiment setting to use charge amplifier instead of voltage amplifier with my team
Regards
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