De Pauw Ben, Goossens Sidney, Geernaert Thomas, Habas Dimitrios, Thienpont Hugo, Berghmans Francis
Department of Applied Physics and Photonics (TONA), Vrije Universiteit Brussel, Brussels Photonics (B-PHOT), Pleinlaan 2, 1050 Brussels, Belgium.
Flanders Make, Oude Diestersebaan 133, 3920 Lommel, Belgium.
Sensors (Basel). 2017 Aug 24;17(9):1948. doi: 10.3390/s17091948.
Conventional contact sensors used for Lamb wave-based ultrasonic inspection, such as piezo-electric transducers, measure omnidirectional strain and do not allow distinguishing between fundamental symmetric and anti-symmetric modes. In this paper, we show that the use of a single fibre Bragg grating created in a dedicated microstructured optical fibre allows one to directly make the distinction between these fundamental Lamb wave modes. This feature stems from the different sensitivities of the microstructured fibre to axial and transverse strain. We fabricated carbon fibre-reinforced polymer panels equipped with embedded microstructured optical fibre sensors and experimentally demonstrated the strain waves associated with the propagating Lamb waves in both the axial and transverse directions of the optical fibre.
用于基于兰姆波的超声检测的传统接触式传感器，如压电换能器，测量的是全向应变，无法区分基本对称模式和反对称模式。在本文中，我们表明，在专用微结构光纤中制作的单个光纤布拉格光栅能够直接区分这些基本兰姆波模式。这一特性源于微结构光纤对轴向应变和横向应变的不同敏感度。我们制作了配备嵌入式微结构光纤传感器的碳纤维增强聚合物板，并通过实验证明了在光纤轴向和横向传播的兰姆波所关联的应变波。
