Takpara Rafatou, Duquennoy Marc, Ouaftouh Mohammadi, Courtois Christian, Jenot Frédéric, Rguiti Mohamed
Univ. Valenciennes, CNRS, Univ. Lille, ISEN, Centrale Lille, UMR 8520 - IEMN, DOAE, F-59313 Valenciennes, France; LMCPA, Université de Valenciennes et du Hainaut-Cambrésis, Pôle Universitaire de Maubeuge, France.
Univ. Valenciennes, CNRS, Univ. Lille, ISEN, Centrale Lille, UMR 8520 - IEMN, DOAE, F-59313 Valenciennes, France.
Ultrasonics. 2017 Aug;79:96-104. doi: 10.1016/j.ultras.2017.04.007. Epub 2017 Apr 19.
Surface acoustic waves (SAW) are particularly suited to effectively monitoring and characterizing structural surfaces (condition of the surface, coating, thin layer, micro-cracks…) as their energy is localized on the surface, within approximately one wavelength. Conventionally, in non-destructive testing, wedge sensors are used to the generation guided waves but they are especially suited to flat surfaces and sized for a given type material (angle of refraction). Additionally, these sensors are quite expensive so it is quite difficult to leave the sensors permanently on the structure for its health monitoring. Therefore we are considering in this study, another type of ultrasonic sensors, able to generate SAW. These sensors are interdigital sensors or IDT sensors for InterDigital Transducer. This paper focuses on optimization of IDT sensors for non-destructive structural testing by using PZT ceramics. The challenge was to optimize the dimensional parameters of the IDT sensors in order to efficiently generate surface waves. Acoustic tests then confirmed these parameters.
表面声波（SAW）特别适合于有效地监测和表征结构表面（表面状况、涂层、薄层、微裂纹等），因为其能量在大约一个波长范围内局域于表面。传统上，在无损检测中，楔形传感器用于产生导波，但它们特别适用于平面，并且针对给定类型的材料（折射角）进行了尺寸设计。此外，这些传感器相当昂贵，因此很难将传感器永久放置在结构上进行健康监测。因此，在本研究中，我们正在考虑另一种能够产生表面声波的超声传感器。这些传感器是叉指式传感器或叉指换能器（IDT）传感器。本文重点研究通过使用PZT陶瓷优化用于无损结构检测的IDT传感器。挑战在于优化IDT传感器的尺寸参数，以便有效地产生表面波。声学测试随后证实了这些参数。
