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Sensors 2017, 17(2), 329; doi:10.3390/s17020329

Effect of the Matching Circuit on the Electromechanical Characteristics of Sandwiched Piezoelectric Transducers

Shaanxi key Laboratory of Ultrasonics, Shaanxi Normal University, Xi’an 710119, China
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Academic Editor: Magnus Willander
Received: 30 November 2016 / Revised: 17 January 2017 / Accepted: 25 January 2017 / Published: 10 February 2017
(This article belongs to the Special Issue Self-Powered Sensors)
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Abstract

The input electrical impedance behaves as a capacitive when a piezoelectric transducer is excited near its resonance frequency. In order to increase the energy transmission efficiency, a series or parallel inductor should be used to compensate the capacitive impedance of the piezoelectric transducer. In this paper, the effect of the series matching inductor on the electromechanical characteristics of the piezoelectric transducer is analyzed. The dependency of the resonance/anti-resonance frequency, the effective electromechanical coupling coefficient, the electrical quality factor and the electro-acoustical efficiency on the matching inductor is obtained. It is shown that apart from compensating the capacitive impedance of the piezoelectric transducer, the series matching inductor can also change the electromechanical characteristics of the piezoelectric transducer. When series matching inductor is increased, the resonance frequency is decreased and the anti-resonance unchanged; the effective electromechanical coupling coefficient is increased. For the electrical quality factor and the electroacoustic efficiency, the dependency on the matching inductor is different when the transducer is operated at the resonance and the anti-resonance frequency. The electromechanical characteristics of the piezoelectric transducer with series matching inductor are measured. It is shown that the theoretically predicted relationship between the electromechanical characteristics and the series matching inductor is in good agreement with the experimental results. View Full-Text
Keywords: piezoelectric transducer; matching electrical inductor; resonance/anti-resonance frequency; effective electromechanical coupling coefficient; electric quality factor; electro-acoustic efficiency piezoelectric transducer; matching electrical inductor; resonance/anti-resonance frequency; effective electromechanical coupling coefficient; electric quality factor; electro-acoustic efficiency
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Lin, S.; Xu, J. Effect of the Matching Circuit on the Electromechanical Characteristics of Sandwiched Piezoelectric Transducers. Sensors 2017, 17, 329.

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