Measurement of vibration of a cantilever beam using Fiber Bragg Grating sensors

Vibration measurement methods for bridges primarily use traditional sensors such as accelerometers. However, these sensors are often large in size and sensitive to environmental factors, leading to signal noise that makes data processing difficult and less accurate. Recently, Fiber Bragg Grating (FBG) sensors have offered advantages such as compact size, high durability, electromagnetic immunity, and high measurement accuracy. This paper presents the application of FBG strain sensors in determining the vibration frequency of a cantilever beam. The study includes the theoretical background on cantilever beam vibrations, the development of a numerical model using the finite element method (FEM), and experimental vibration measurements using FBG sensors. The experimental results are compared with theoretical and FEM-based results, demonstrating a high degree of agreement, thereby confirming the feasibility and advantages of using FBG sensors for vibration measurement.