Application of ellipse and hyperbola methods for guided waves based structural health monitoring using fiber Bragg grating sensors

Rohan Soman; Ali Golestani; Kaleeswaran Balasubramaniam; Michał Karpiński; Paweł Malinowski; Wieslaw Ostachowicz

doi:10.1117/12.2582979

22 March 2021 Application of ellipse and hyperbola methods for guided waves based structural health monitoring using fiber Bragg grating sensors

Rohan Soman, Ali Golestani, Kaleeswaran Balasubramaniam, Michał Karpiński, Paweł Malinowski, Wieslaw Ostachowicz

Author Affiliations +

Proceedings Volume 11593, Health Monitoring of Structural and Biological Systems XV; 115930F (2021) https://doi.org/10.1117/12.2582979
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

Guided waves (GW) allow fast inspection of a large area and hence have received great interest from the structural health monitoring (SHM) community. Fiber Bragg grating (FBG) sensors offer several advantages but their use has been limited for the GW sensing due to their limited sensitivity. FBG sensors in the edge-filtering configuration have overcome the issue with sensitivity and there is a renewed interest in their use. The FBG sensors have directional sensitivity and are passive in nature. This makes it difficult to apply the existing signal processing and damage detection techniques such as tomography, phased array approach etc. As a result, there is a need to develop novel damage detection techniques which take into consideration the specific limitations of the use of FBG sensors. This paper applies the ellipse and hyperbola based techniques for a FBG sensor based network. The paper identifies the specific challenges and applies solutions to overcome those challenges. A comparative assessment of the two methods is presented with the help of experimental data.

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Rohan Soman, Ali Golestani, Kaleeswaran Balasubramaniam, Michał Karpiński, Paweł Malinowski, and Wieslaw Ostachowicz "Application of ellipse and hyperbola methods for guided waves based structural health monitoring using fiber Bragg grating sensors", Proc. SPIE 11593, Health Monitoring of Structural and Biological Systems XV, 115930F (22 March 2021); https://doi.org/10.1117/12.2582979

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