Acoustic fields from PVDF interdigital transducers
Acoustic fields from PVDF interdigital transducers
复制标题
DOI：
10.1049/ip-smt:19982213
复制
发表时间：
1998-09
期刊：
影响因子：
--
通讯作者：
P. Wilcox;P. Cawley;M. Lowe
中科院分区：
文献类型：
--
作者：
P. Wilcox;P. Cawley;M. Lowe
由压电聚合物PVDF制成的叉指换能器（IDT）已经建成;它们将超声兰姆波发射到1-2 mm厚的钢板和铝板中，并接收从结构中的特征反射的信号。叉指换能器设计为永久性地连接到受检结构上。这种IDT在智能结构监测应用中具有相当大的潜力。然而，在实现这一潜力之前，必须彻底了解它们产生的声场的性质。实验测得的声场提出了两个例子叉指换能器，一个产生一个准直光束的线检查和一个产生一个发散光束的部门检查。然后描述了基于惠更斯原理的建模软件的开发，该软件使这种IDT的声场能够被快速预测。该软件的示例结果，并与实验测量结果进行比较。进一步的预测模型，然后用来阐明IDT设计的某些基本准则。
Interdigital transducers (IDTs) made from the piezoelectric polymer PVDF have been built; they transmit ultrasonic Lamb waves into 1-2 mm thick steel and aluminium plates and receive signals reflected from features in the structure. The IDTs are designed to be permanently bonded to the structure under inspection. Such IDTs have considerable potential for use in smart-structure monitoring applications. However, before this potential can be realised, the nature of the acoustic field that they produce must be thoroughly understood. Experimentally measured acoustic fields are presented for two example IDTs, one that produces a collimated beam for line inspection and one that produces a divergent beam for sector inspection. The development of modelling software based on Huygens' principle, which enables the acoustic field from such IDTs to be predicted rapidly, is then described. Example results from this software are presented and compared with experimental measurements. Further predictions made with the model are then used to elucidate certain basic guidelines for IDT design.