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压电复合材料由于集中了压电相和非压电相各自的优点而得到了深入研究和广泛应用。2-2型压电复合材料的压电相和非压电相均在两个方向上自我连通。在直角坐标系中,两相材料呈层状间隔排列。在柱坐标系中,两相材料可以在轴向和切向分别自我连通,即同轴沿径向间隔排列。为作区别,称前者为普通2-2型压电复合材料,称后者为圆柱2-2型压电复合材料。后者的一个用途是产生扭转振动。 本文以圆柱2-2型压电复合材料为基础,使压电相的极化方向沿圆周一致排列,制成具有扭转振动的拼接2-2型压电复合材料。本文给出了两片这种压电材料晶片的参数,制作了产生扭转振动的横波换能器,测试了换能器的偏振特性,分析了接收波列中纵波抑制较强的原因。这种压电材料的特性阻抗较低,易于与岩石等材料匹配,提高了换能器的灵敏度。
Piezoelectric composites have been extensively researched and widely used due to the respective advantages of piezoelectric and non-piezoelectric phases. Both the piezoelectric and non-piezoelectric phases of 2-2 piezoelectric composite are self-connected in both directions. In Cartesian coordinates, the two-phase materials are arranged in a layer at intervals. In the cylindrical coordinate system, the two-phase material can be self-communicating in the axial and tangential directions respectively, ie, the coaxial axes are arranged at radial intervals. To make the difference, said the former is an ordinary 2-2 piezoelectric composite, said the latter 2-2 cylindrical piezoelectric composite material. One use of the latter is to produce torsional vibrations. In this paper, cylindrical 2-2 piezoelectric composite material based on the polarization direction of the piezoelectric phase along the circumference of the uniform arrangement made of torsional vibration splicing 2-2 piezoelectric composite material. In this paper, the parameters of two piezoelectric wafers are given. The shear wave transducer which produces torsional vibration is fabricated. The polarization characteristics of the transducer are tested. The reason why the longitudinal wave suppression is strong in the receiving wave train is analyzed. This piezoelectric material has a lower characteristic impedance and is easier to match with materials such as rock and improves the transducer's sensitivity.