ABSTRACT Surface acoustic waves (SAW) are particularly suited for effectively monitoring and characterizing a structure’s surfaces (condition of the surface, coating, thin layer, micro-cracks, etc.), and in some cases it is necessary to permanently keep the sensors on the structures to enable continuous monitoring. This article focuses on the optimization of SAW-type interdigital sensors (or IDT sensors for InterDigital Transducer) because they can largely address this issue. Initially, the ability of piezoelectric materials (lead zirconate titanate [PZT] and Niobate de lithium) to generate SAW is studied by modeling. Then a design of an IDT sensor is defined and optimized for the generation of SAW on a substrate. Parameters such as electrode’s periodicity, thickness of piezoelectric plate, and type of contact between the plate and the substrate, are studied. Finally, experimental results are compared with those obtained by modeling.

中文翻译：

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超声波SHM用SAW型面波超声波传感器的优化

摘要 表面声波 (SAW) 特别适用于有效监测和表征结构表面（表面状况、涂层、薄层、微裂纹等），在某些情况下，有必要将传感器永久保持开启状态。能够实现持续监控的结构。本文重点介绍 SAW 型叉指传感器（或用于 InterDigital Transducer 的 IDT 传感器）的优化，因为它们可以在很大程度上解决这个问题。首先，通过建模研究压电材料（锆钛酸铅 [PZT] 和铌酸锂）产生 SAW 的能力。然后定义并优化 IDT 传感器的设计，以在基板上生成 SAW。电极周期、压电板厚度、板与基板接触方式等参数，被研究。最后，将实验结果与通过建模获得的结果进行比较。