论文部分内容阅读
本文介绍了一种2－2型压电复合材料，使其中的极化方向和所加电场方向相同，并垂直于该方向面辐射声波．由于压电晶片具有长度和厚度的伸缩振动，这种材料将向介质同时辐射纵波和横波，但纵横波的频率存在差异，因而通过施用适当的高通或低通虑波器，可获得单一模式的波．本文还指出，接收波列中的纵波和横波的首波位相相反，以及这两种波随两个换能器相对夹角的变化趋势等．
In this paper, a type 2-2 piezoelectric composite is introduced in which the direction of polarization is the same as the direction of the applied electric field and radiates sound waves perpendicular to the direction. Because piezoelectric wafers have length and thickness stretching vibration, this material will radiate both longitudinal and transverse waves to the medium at the same time, but there are differences in the frequencies of the longitudinal and transverse waves so that by applying a suitable high-pass or low-pass filter, a single mode wave. The paper also points out that the first wave phase of the longitudinal wave and the transverse wave in the received wave train is opposite and the trend of these two waves with the relative angle of the two transducers is the same.