Hello all,
I have a piezo transducer meant for welding and/or cleaning...
It will be used to set a "structure" into a resonant vibration... Not the first mode of vibration but rather a higher mode in the range of 20kHz to 30kHz..
It will be bolted to the structure and the structure may undergo some change... therefore it's resonant frequency will depend on the structure and will vary unpredictably...
I would like to be able to indicated when its operating at its resonant frequency...
As I understand, it will be at it's resonant frequency when the impedance is at it's lowest...
I have seen a method where the transducer is connected in series with a resistor... A scope across the transducer will indicate a relative impedance...
However... as I would like to drive the transducer while checking for resonance... What and/or how should I be measuring???
The specs of the transducer are as follows:
Resonant frequency: 28 kHz
Resonant impedance: 30 Ohm max
Static capacitance: 2500 pf
Max operating power: 200 Watts
Lenght dimension: 91.4 mm
Diameter dimension: 30 mm
Thanks,
Michael
I have a piezo transducer meant for welding and/or cleaning...
It will be used to set a "structure" into a resonant vibration... Not the first mode of vibration but rather a higher mode in the range of 20kHz to 30kHz..
It will be bolted to the structure and the structure may undergo some change... therefore it's resonant frequency will depend on the structure and will vary unpredictably...
I would like to be able to indicated when its operating at its resonant frequency...
As I understand, it will be at it's resonant frequency when the impedance is at it's lowest...
I have seen a method where the transducer is connected in series with a resistor... A scope across the transducer will indicate a relative impedance...
However... as I would like to drive the transducer while checking for resonance... What and/or how should I be measuring???
The specs of the transducer are as follows:
Resonant frequency: 28 kHz
Resonant impedance: 30 Ohm max
Static capacitance: 2500 pf
Max operating power: 200 Watts
Lenght dimension: 91.4 mm
Diameter dimension: 30 mm
Thanks,
Michael