In this paper, the use of a phase-sensitive optical time-domain reflectometry (ϕ-OTDR) sensor for the detection of the Lamb waves excited by a piezoelectric transducer in an aluminum plate, is investigated. The system is shown to detect and resolve the Lamb wave in distinct regions of the plate, opening the possibility of realizing structural health monitoring (SHM) and damage detection using a single optical fiber attached to the structure. The system also reveals the variations in the Lamb wave resulting from a change in the load conditions of the plate. The same optical fiber used to detect the Lamb waves has also been employed to realize distributed strain measurements using a Brillouin scattering system. The method can be potentially used to replace conventional SHM sensors such as strain gauges and PZT transducers, with the advantage of offering several sensing points using a single fiber.

中文翻译：

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使用 ϕ-OTDR 系统进行结构健康监测的 Lamb 波检测

在本文中，研究了使用相敏光学时域反射计 (φ-OTDR) 传感器来检测由铝板中的压电换能器激发的兰姆波。该系统被证明可以检测和解析板不同区域的兰姆波，从而为使用连接到结构的单根光纤实现结构健康监测 (SHM) 和损伤检测提供了可能性。该系统还揭示了板负载条件变化导致的兰姆波变化。用于检测兰姆波的相同光纤也已用于使用布里渊散射系统实现分布式应变测量。该方法可以潜在地用于替代传统的 SHM 传感器，例如应变仪和 PZT 传感器，