I need to calculate constants such as "permittivity", "direct piezoelectric effect" and "compliance" for an unknown piezopolymer experimentally. Is there anyone who is able to guide me?
Regards.
First measure the capacitance from LCR meter and than calculate the permittivity or dielectric constant.
You need to pole your piezo before measuring the piezoelectric coefficients (g33 and d33) and electromechanical coupling coefficients.
After poling do the Impedance vs. frequency sweep, use resonance and antiresonance frequency to calculate the electromechanical coupling coefficients and elastic compliance.
Mohammad:
In oder to obtaid some aid in your experimental work, perhaps you must study some documents about it, like these:
- "Electromechanical properties of 1-3 piezoelectric ceramic-piezoelectric polymer composites". By: H. Taunaumanga, I. L. Guy, H. L. W. Chan. J. Appl. Phys., Vol. 70, No. 1, 1 July; pp. 484-489. 1994.
- "The dielectric, mechanical and piezoelectric properties of 3-3 piezoelectric composites". By: Ramesh, R., Kara, H. and Bowen, C. R. Ferroelectrics, 273, pp. 383-388. 2002.
A. Ramos
Helpful answers, but is it possible to obtain them using parameters estimation when applying a voltage and measuring the displacement?
Dear Marwan and Mohammad:
In order to obtain internal parameters in an unknown piezolectric device, simply by an estimation procedure, when you apply a voltage and measure the subsequents displacements (as Marwan says), you would need to dispose of an accurate mathematical model of its internal behaviour (including the desired parameters) just in the real working conditions, and obtain the corresponding Transfer Function, before to apply an estimation algoritm. For instance, there are papers dealing with this aim for the case of classical PZT piezoelectric tranducers. You can find methods and results for it in the papers:
- “ESTIMATION OF SOME TRANSDUCER PARAMETERS IN A BROADBAND PIEZOELECTRIC TRANSMITTER BY USING ARTIFICIAL INTELLIGENCE TECHNIQUES”, by A. RUÍZ, A. RAMOS , J. L. SAN EMETERIO. ULTRASONICS, Vol. 42, pp. 459-463, (2004).
- “EVALUATION OF PIEZOELECTRIC RESONATOR PARAMETERS USING AN ARTIFICIAL INTELLIGENCE TECHNIQUE”, by A. RUIZ, J.L. SAN EMETERIO, A. RAMOS. INTEGRATED FERROELECTRICS, Vol. 63, pp. 137-141. (2004).
Regards,
Antonio
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