Teplykh Andrey, Zaitsev Boris, Semyonov Alexander, Borodina Irina
Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Saratov Branch, 410019 Saratov, Russia.
Sensors (Basel). 2021 Jan 17;21(2):608. doi: 10.3390/s21020608.
A new type of piezoceramic acoustic resonator in the form of a circular disk with a radial exciting electric field is presented. The advantage of this type of resonator is the localization of the electrodes at one end of the disk, which leaves the second end free for the contact of the piezoelectric material with the surrounding medium. This makes it possible to use such a resonator as a sensor base for analyzing the properties of this medium. The problem of exciting such a resonator by an electric field of a given frequency is solved using a two-dimensional finite element method. The method for solving the inverse problem for determining the characteristics of a piezomaterial from the broadband frequency dependence of the electrical impedance of a single resonator is proposed. The acoustic and electric field inside the resonator is calculated, and it is shown that this location of electrodes makes it possible to excite radial, flexural, and thickness extensional modes of disk oscillations. The dependences of the frequencies of parallel and series resonances, the quality factor, and the electromechanical coupling coefficient on the size of the electrodes and the gap between them are calculated.
提出了一种新型的压电陶瓷声谐振器，其呈具有径向激励电场的圆盘形式。这种类型谐振器的优点是电极位于圆盘的一端，使得圆盘的另一端可自由地用于压电材料与周围介质接触。这使得能够将这种谐振器用作分析该介质特性的传感器基础。使用二维有限元方法解决了由给定频率的电场激励这种谐振器的问题。提出了一种用于解决逆问题的方法，该逆问题是根据单个谐振器的电阻抗的宽带频率依赖性来确定压电材料的特性。计算了谐振器内部的声场和电场，并表明电极的这种布置使得能够激发圆盘振荡的径向、弯曲和厚度拉伸模式。计算了并联和串联谐振频率、品质因数以及机电耦合系数对电极尺寸及其之间间隙的依赖性。
