Fiber bragg grating-based fabry-perot interferometer sensor for damage detection on thin aluminum plate

• Main Authors: Nurazima, Ismail, Z. M., Hafizi, Ooi, Cheong-Weng, Muhammad Khairol Annuar, Zaini, Che Ku Eddy Nizwan, Che Ku Husin, Lim, Kok-Sing, Harith, Ahmad
• Format: Article
• Language: English; English
• Published: IEEE 2020
• Subjects: TJ Mechanical engineering and machinery; TK Electrical engineering. Electronics Nuclear engineering; TL Motor vehicles. Aeronautics. Astronautics
• Online Access: http://umpir.ump.edu.my/id/eprint/28671/1/Fiber%20bragg%20grating-based%20fabry-perot%20interferometer%20sensor%20.pdf; http://umpir.ump.edu.my/id/eprint/28671/2/Fiber%20bragg%20grating-based%20fabry-perot%20interferometer%20sensor_FULL.pdf; http://umpir.ump.edu.my/id/eprint/28671/; https://doi.org/10.1109/JSEN.2019.2959068; https://doi.org/10.1109/JSEN.2019.2959068

Structural Health Monitoring of engineering structures has become an essential measure for the prevention of catastrophic failures. This study presented a feasibility study of Fiber Bragg Grating-based Fabry-Perot interferometer (FBG-FPI) sensor for damage detection on an aluminum plate, by acoustic Lamb wave technique. In the investigation, a rectangular damage slot was introduced to the plate, at 15 cm from the actuator. Two FBG-FPI sensors were surface-mounted on the aluminum plate for the detection. In the analysis, we observed an additional wave packet with attenuated amplitude and time delay in the time-domain signal for the defect plate. Similar features are observed in the time-frequency spectrograms and they are important signatures that can be used for detecting the defect. The findings show the applicability of FBG-FPI sensor for damage detection on a thin-walled metallic structure.