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Characterization of Transducers and Resonators under High Drive LevelsIn many applications, piezoelectric transducers are driven at AC voltage levels well beyond the level for which the material was nominally characterized. In this paper we describe an experimental setup that allows for the determination of the main transducer or resonator properties under large AC drive. A sinusoidal voltage from a waveform generator is amplified and applied across the transducer/resonator in series with a known high power resistor. The amplitude of applied voltage and the amplitude and the relative phase of the current through the resistor are monitored on a digital scope. The frequency of the applied signal is swept through resonance and the voltage/current signals are recorded. After corrections for the series resistance and parasitic elements the technique allows for the determination of the complex impedance spectra of the sample as a function of frequency. In addition, access to the current signal allows for the direct investigation of non-linear effects through the application of Fourier transform techniques on the current signal. Our results indicate that care is required when interpreting impedance data at high drive level due to the frequency dependence of the dissipated power. Although the transducer/resonator at a single frequency and after many cycles may reach thermal equilibrium, the spectra as a whole cannot be considered an isothermal measurement due to the temperature change with frequency. Methods to correct for this effect will be discussed. Results determined from resonators of both soft and hard PZT and a ultrasonic horn transducer are presented.
Document ID
20070034839
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
Authors
Sherrit, Stewart
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bao, X.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Sigel, D. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Gradziel, M. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Askins, S. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Dolgin, B. P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bar-Cohen, Y.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
October 7, 2001
Subject Category
Electronics And Electrical Engineering
Meeting Information
Meeting: IEEE International Ultrasonics Symposium
Location: Atlanta, GA
Country: United States
Start Date: October 7, 2001
End Date: October 10, 2001
Sponsors: Institute of Electrical and Electronics Engineers
Distribution Limits
Public
Copyright
Other
Keywords
transducers
resonators

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