Development and comprehensive investigation of a lightweight FBG accelerometer for small structure acceleration measurements

• Main Authors: Muhammad Rais, Rahim, Hossain, MD Mofazzal, Mohd Firdaus, Hassan
• Format: Article
• Language: English; English
• Published: IOP Publishing 2024
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://umpir.ump.edu.my/id/eprint/42359/1/ISI%206.%20Development%20and%20comprehensive%20investigation%20of%20a%20lighweight%20FBG%20accelerometer%20for%20small%20structure%20acceleration%20measurements.pdf; http://umpir.ump.edu.my/id/eprint/42359/7/Development%20and%20comprehensive%20investigation%20of%20a%20lightweight%20FBG%20accelerometer_ABST.pdf; http://umpir.ump.edu.my/id/eprint/42359/; https://doi.org/10.1088/1361-6501/ad5dea; https://doi.org/10.1088/1361-6501/ad5dea

Despite their sensitivity potential, diaphragm-type fiber Bragg grating accelerometers with inertia mass are often too complex and large, limiting their suitability for measuring small structures. Designing a suitable accelerometer for small structures, where its weight must be less than one-tenth of the measured structure, is challenging. This paper introduces a compact, simplified, and fabricable non-inertia mass FBG accelerometer (FBGA-SD), featuring a longer FBG tunnel and a through-hole for monitoring. The proposed FBGA-SD is 16 × 16 × 10 mm, weighing 4 grams. Numerical and experimental results show good agreement, though amplitude sensitivity differs by 50%. The experimental sensitivity is 9.64 × 10−2 pm g−1, while transient response analysis gives 4.79 × 10−2 pm g−1, valid for 10–100 Hz excitation frequencies and up to 10.5 m s−2 base acceleration.