Tried the setup out and seemed to start working well, but only the amplitude of channel 2 changed on my end. There was no phase shift that designated movement between resonance/antiresonance. Do you have any advice for what I may be doing incorrectly? I'm using a piezoceramic ring stack. Not sure what other variables could change the results.
The phase shift might be small depending on the type of transducer. However, for a ring, I would expect a larger phase change. I think you should use a lower value resistor.
Sorry i have many questions, I will try your experiments and i need this following parameters: Voltage Amplitude? (from the function generator), how did you connect the contacts? (positive and negative terminal to the PZT material). Thank you very much!
The piezo element is in series with a ground side resistor. The open end of the resistor is grounded. Voltage measurement is done at the high side (piezo open end) and in between the piezo and resistor.
I think it's to measure the voltage drop across the piezoelectric chip, which is minimal at the resonant frequency and maximal at the antiresonant frequency.
Yes, a piezo stack can be driven at resonance to find the resonance frequency. However, piezo stacks generally are not designed to be driven at high power in resonance, so you must not use an amplifier. This is strictly a measurement experiment in your case.
Salam aleykum. I have a transducer with a long horn connected to it. (I can share the photo if you give me an email address). the manufacturer of this transducer says that based on impedance analysis the resonance frequency is on 23khz. but I did the resonance test by a signal generator and an oscilloscope but there is a obvious phase shift in that frequency. how can we interpret this difference? I mean is this simple method that you are presenting in this video always reliable?
Yes, there is significant phase shift at resonance. Yes, the method is always reliable, although for some transducer the phase change is less dramatic.
What type of piezoelectric you used? and what is now the exact resonant frequency? (frequency you mean angular or the normal physical frequency?) thanks!
Ah i see. So if i will do the normal piezoelectric effect, where i will apply force or frequency (resonant frequency) it will generate the same amount voltage as you demonstrate?
Ah okay so the point of demonstrating the reverse piezoelectric effect is to determine only the resonant frequency, and not generated voltage because it will change in normal piezoelectric experiment.
Tried the setup out and seemed to start working well, but only the amplitude of channel 2 changed on my end. There was no phase shift that designated movement between resonance/antiresonance. Do you have any advice for what I may be doing incorrectly? I'm using a piezoceramic ring stack. Not sure what other variables could change the results.
The phase shift might be small depending on the type of transducer. However, for a ring, I would expect a larger phase change. I think you should use a lower value resistor.
Sorry i have many questions, I will try your experiments and i need this following parameters: Voltage Amplitude? (from the function generator), how did you connect the contacts? (positive and negative terminal to the PZT material). Thank you very much!
The piezo element is in series with a ground side resistor. The open end of the resistor is grounded. Voltage measurement is done at the high side (piezo open end) and in between the piezo and resistor.
Sir can this be used in SAW device to find the resonance frequency?
Why subtracting channel 2 from 1, when we can directly measure phase from these digital oscilloscope?
I think it's to measure the voltage drop across the piezoelectric chip, which is minimal at the resonant frequency and maximal at the antiresonant frequency.
Could this method use in measuring Piezo stack? Thank you!
Yes, a piezo stack can be driven at resonance to find the resonance frequency. However, piezo stacks generally are not designed to be driven at high power in resonance, so you must not use an amplifier. This is strictly a measurement experiment in your case.
Salam aleykum.
I have a transducer with a long horn connected to it. (I can share the photo if you give me an email address). the manufacturer of this transducer says that based on impedance analysis the resonance frequency is on 23khz. but I did the resonance test by a signal generator and an oscilloscope but there is a obvious phase shift in that frequency. how can we interpret this difference? I mean is this simple method that you are presenting in this video always reliable?
Yes, there is significant phase shift at resonance. Yes, the method is always reliable, although for some transducer the phase change is less dramatic.
What type of piezoelectric you used? and what is now the exact resonant frequency? (frequency you mean angular or the normal physical frequency?) thanks!
another question do you try the reverse piezoelectric effect? where you apply voltage and it will oscillate?
Ah i see. So if i will do the normal piezoelectric effect, where i will apply force or frequency (resonant frequency) it will generate the same amount voltage as you demonstrate?
Ah okay so the point of demonstrating the reverse piezoelectric effect is to determine only the resonant frequency, and not generated voltage because it will change in normal piezoelectric experiment.
Good
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