采用高机电耦合系数材料的分段压电叠堆换能器的性能
Performance of transducers with segmented piezoelectric stacks using materials with high electromechanical coupling coefficient
摘要：
水下声学换能器通常包括交替极性的厚度极化压电材料片的堆叠，所述厚度极化压电材料片散布有电极，所述电极结合在一起并且并联电连接。堆叠通常比基本谐振频率处的四分之一波长短得多，使得换能器的机械行为不受分割的影响。当换能器带宽小于半个倍频程时，如常规情况，堆叠分段对设备的机械行为没有显著影响。然而，当使用诸如PMN-PT的高耦合系数材料来实现更宽的带宽时，分段堆叠与仅在两端具有电极的类似压电区段之间的差异可能是显著的。本文研究了叠层分割对宽带水声换能器，特别是tonpilz换能器单元性能的影响。包括使用单晶压电材料与更传统的PZT陶瓷相比，具有高耦合系数的换能器设计的讨论。
英文摘要：
Underwater acoustic transducers often include a stack of thickness polarized piezoelectric material pieces of alternating polarity interspersed with electrodes, bonded together and electrically connected in parallel. The stack is normally much shorter than a quarter wavelength at the fundamental resonance frequency, so that the mechanical behavior of the transducer is not affected by the segmentation. When the transducer bandwidth is less than a half octave, as has conventionally been the case, stack segmentation has no significant effect on the mechanical behavior of the device. However, when a high coupling coefficient material such as PMN-PT is used to achieve a wider bandwidth, the difference between a segmented stack and a similar piezoelectric section with electrodes only at the two ends can be significant. This paper investigates the effects of stack segmentation on the performance of wideband underwater acoustic transducers, particularly tonpilz transducer elements. Included is discussion of transducer designs using single crystal piezoelectric material with high coupling coefficient compared with more traditional PZT ceramics.
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