Abstract
Early damage detection in large structures requires monitoring of their dynamic behaviors, and measuring
low-frequency vibrations is essential. We propose a hetero-core fiber-optic accelerometer designed to
measure low-frequency vibrations to meet this requirement. This accelerometer has an excellent
cost-performance measurement system based on light intensity and durability that resists electromagnetic
interference, corrosion, and temperature changes. Furthermore, hetero-core fiber-optic accelerometers
based on beam structure, specifically a cantilever and a semicircular curved beam, have an advantage of
being constructed solely with optical fibers. Hence, the optical fiber itself functions as a beam structure,
facilitating the miniaturization of the device’s housing. Therefore, this paper focuses on sensors with
cantilevered and semicircular curved beam structures and presents their performances, including resonant
frequency, sensitivity, and transverse sensitivity.
