School of Mechanical Engineering, Kyungpook National University, Daegu 41556, Korea.
Maritime Integrated Security Systems, LIG Nex1 Co. Ltd., Seongnam 13488, Korea.
Sensors (Basel). 2021 Apr 10;21(8):2680. doi: 10.3390/s21082680.
Tonpilz transducers are desirable for their superior performance in underwater target detection and communication applications. Several design schemes to widen their bandwidth have been reported, but these schemes often involve a complex structure or arrangement of additional components. In this study, a simple design is proposed to improve the bandwidth of a multimode Tonpilz transducer by using a non-uniform drive section that consists of piezoelectric stacks of various thicknesses. The efficacy of the design is illustrated with a multimode Tonpilz transducer having three lead zirconate titanate (PZT) stacks of different thicknesses. A new equivalent circuit was developed to analyze the frequency response of the transducer incorporating the non-uniform drive section and was used for rigorous analysis of the effects of varying the position and thickness of the non-uniform stacks on the transmitting characteristics of the transducer. The validity of the design was verified through the fabrication and characterization of a prototype multimode Tonpilz transducer. The developed structure can be readily extended to an arbitrary number of stacks in the Tonpilz transducer with any number of PZT disks in each stack.
蘑菇换能器因其在水下目标探测和通信应用中的卓越性能而备受青睐。已经有几种设计方案被报道用于拓宽其带宽，但这些方案通常涉及复杂的结构或额外组件的布置。在这项研究中，提出了一种简单的设计，通过使用由不同厚度的压电堆叠组成的非均匀驱动部分来提高多模蘑菇换能器的带宽。通过具有三个不同厚度的锆钛酸铅（PZT）堆叠的多模蘑菇换能器说明了该设计的有效性。开发了一种新的等效电路来分析包含非均匀驱动部分的换能器的频率响应，并用于严格分析改变非均匀堆叠的位置和厚度对换能器发射特性的影响。通过制造和表征原型多模蘑菇换能器验证了设计的有效性。所开发的结构可以很容易地扩展到任意数量的堆叠在 Tonpilz 换能器中，每个堆叠中可以有任意数量的 PZT 盘。
