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Sensors 2017, 17(12), 2832; https://doi.org/10.3390/s17122832

The Effect of Electrical Impedance Matching on the Electromechanical Characteristics of Sandwiched Piezoelectric Ultrasonic Transducers

Department of Electronic Engineering, Xi’an University of Technology, Xi’an 710048, Shaanxi, China
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Received: 4 November 2017 / Revised: 24 November 2017 / Accepted: 30 November 2017 / Published: 6 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

For achieving the power maximum transmission, the electrical impedance matching (EIM) for piezoelectric ultrasonic transducers is highly required. In this paper, the effect of EIM networks on the electromechanical characteristics of sandwiched piezoelectric ultrasonic transducers is investigated in time and frequency domains, based on the PSpice model of single sandwiched piezoelectric ultrasonic transducer. The above-mentioned EIM networks include, series capacitance and parallel inductance (I type) and series inductance and parallel capacitance (II type). It is shown that when I and II type EIM networks are used, the resonance and anti-resonance frequencies and the received signal tailing are decreased; II type makes the electro-acoustic power ratio and the signal tailing smaller whereas it makes the electro-acoustic gain ratio larger at resonance frequency. In addition, I type makes the effective electromechanical coupling coefficient increase and II type makes it decrease; II type make the power spectral density at resonance frequency more dramatically increased. Specially, the electro-acoustic power ratio has maximum value near anti-resonance frequency, while the electro-acoustic gain ratio has maximum value near resonance frequency. It can be found that the theoretically analyzed results have good consistency with the measured ones. View Full-Text
Keywords: sandwiched piezoelectric ultrasonic transducers; electrical impedance matching; effective electro-mechanical coupling coefficient; electro-acoustic power ratio; electro-acoustic gain ratio sandwiched piezoelectric ultrasonic transducers; electrical impedance matching; effective electro-mechanical coupling coefficient; electro-acoustic power ratio; electro-acoustic gain ratio
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Yang, Y.; Wei, X.; Zhang, L.; Yao, W. The Effect of Electrical Impedance Matching on the Electromechanical Characteristics of Sandwiched Piezoelectric Ultrasonic Transducers. Sensors 2017, 17, 2832.

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