Borodina I A, Zaitsev B D, Teplykh A A
Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Saratov Branch, Saratov 410019, Russia.
Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Saratov Branch, Saratov 410019, Russia.
Ultrasonics. 2018 Jan;82:39-43. doi: 10.1016/j.ultras.2017.07.011. Epub 2017 Jul 18.
The influence of the liquid with the different values of conductivity, permittivity, and viscosity on the characteristics of the slot mode in the structure consisting of delay line with propagating shear - horizontal acoustic wave of zero order (SH) and upper piezoelectric plate separated by the air gap was experimentally investigated. The delay line made of the Y-X lithium niobate plate 0.2mm thick contained two interdigital transducers for the excitation and reception of acoustic wave in the frequency range of 2.6-3.8MHz. The upper plate represented the 0.5mm thick plate of Z-X lithium niobate. The excitation of the slot mode led to the appearance of the sharp resonant peaks on the frequency dependencies of insertion loss and phase of the output signal. It has been found that the depth and frequency of these peaks depend on the parameters of liquid contacting with the upper plate. The possibility of the use of the slot mode in the pointed structure for the identification of liquids with the different values of the conductivity, viscosity, and permittivity was shown. The qualitative explanations of the obtained experimental results are presented.
实验研究了具有不同电导率、介电常数和粘度的液体对由零阶传播剪切水平声波（SH）延迟线和由气隙隔开的上压电板组成的结构中槽模式特性的影响。由厚度为0.2mm的Y-X铌酸锂板制成的延迟线包含两个叉指换能器，用于在2.6 - 3.8MHz频率范围内激发和接收声波。上板是厚度为0.5mm的Z-X铌酸锂板。槽模式的激发导致输出信号的插入损耗和相位的频率依赖性上出现尖锐的共振峰。已经发现这些峰的深度和频率取决于与上板接触的液体的参数。展示了在尖状结构中使用槽模式识别具有不同电导率、粘度和介电常数的液体的可能性。给出了对所得实验结果的定性解释。
