Double-L Cantilever-Based Fiber Bragg Grating Accelerometer

Optical accelerometers, especially the fiber Bragg grating accelerometers are the preferred sensors for vibration, and acceleration measurement in several fields of engineering. They are light, compact, immune to electromagnetic interference, and provide better noise immunity due to wavelength encoded nature of signal transduction. In the present work, analytical modeling, numerical simulation, fabrication, and characterization of a novel double-L cantilever based fiber Bragg grating accelerometer is presented. This design not only enhances the sensitivity in comparison to its single-L counterpart, but also provides self-temperature compensation. Modular design of the accelerometer provides flexibility in replacing specific components to achieve desired performance characteristics. Resonant frequency of 86 Hz, sensitivity of 406.7 pm/g with an excellent linearity of 99.86 %, and small temperature sensitivity of 0.016 pm/°C have been demonstrated for the fabricated model. The FBG accelerometer has a linear operating range of ±6 g.