Influence of the conductivity of a liquid contacting with a lateral electric field excited resonator based on PZT ceramics on its characteristics

I A Borodina; B D Zaitsev; A A Teplykh

doi:10.1016/j.ultras.2019.106059

Influence of the conductivity of a liquid contacting with a lateral electric field excited resonator based on PZT ceramics on its characteristics

Ultrasonics. 2020 Mar:102:106059. doi: 10.1016/j.ultras.2019.106059. Epub 2019 Dec 7.

Authors

I A Borodina¹, B D Zaitsev², A A Teplykh²

Affiliations

¹ Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Saratov Branch, Saratov 410019, Russia. Electronic address: borodinaia@yandex.ru.
² Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Saratov Branch, Saratov 410019, Russia.

PMID: 31948806
DOI: 10.1016/j.ultras.2019.106059

Abstract

The influence of the conductivity of a liquid contacting with a piezoelectric resonator with a lateral electric field based on a PZT piezoceramic plate was experimentally and theoretically investigated. In this resonator the shear component of the mechanical displacement, which does not lead to radiation losses upon contact with the liquid, was prevalent. The frequency dependences of the real and imaginary parts of the electrical impedance of the resonator in the frequency range 50-300 kHz showed the presence of three resonances at frequencies of 68.7, 97.8 and 264 kHz with the values of the electro-mechanical coupling coefficient of 12.2%, 14.7% and 6.5%, respectively. The quality factor of each resonance in contact with the liquid turned out to be significantly higher than the quality factor of the resonator with a longitudinal acoustic wave based on lithium niobate. The dependences of the maximum value of the real part of the electrical impedance of such a resonator on the conductivity of the liquid for each resonance were obtained. This experimental data turned out to be in a good agreement with theoretical results obtained by using the method of equivalent circuit.

Keywords: Conductivity of liquid; Electrical impedance and admittance; Electromechanical coupling coefficient; PZT resonator with lateral electric field; Parallel and series resonances.