超声换能器通常使用石英晶体,硫酸锂、酒石酸钾钠单晶以及钛酸钡,锆钛酸铅等强电介质压电陶瓷。最近为了适应高频超声波换能器的要求,研究开发了钠酸锂单晶和ZnO多晶压电薄膜。高分子压电材料作为超声换能器材料也越来越引起人们的关注。具有极性结构的高分子膜,特别是PVDP高分子薄膜,在强电场中极化后,显示出强的压电效应,并可发、收兆赫带 Ultrasonic transducers are usually made of quartz crystal, lithium sulfate, sodium potassium tartrate single crystal and barium titanate, lead zirconate titanate and other ferroelectric piezoelectric ceramics. Recently, in order to meet the requirements of high-frequency ultrasonic transducers, research and development of lithium sodium carbonate single crystal and ZnO polycrystalline piezoelectric film. Polymer piezoelectric material as an ultrasonic transducer material is also attracting more and more attention. The polymer film with a polar structure, especially the PVDP polymer film, shows strong piezoelectric effect after being polarized in a strong electric field and can send and receive megahertz bands