We report on the fabrication and characterization of the first accelerometer based on a polymer optical fiber Bragg grating (FBG) for operation at both 850 and 1550 nm. The devices have a flat frequency response over a 1-kHz bandwidth and a resonance frequency of about 3 kHz. The response is linear up to at least 15 g and sensitivities as high as 19 pm/g (shift in resonance wavelength per unit acceleration) have been demonstrated. Given that 15 g corresponds to a strain of less than 0.02% and that polymer fibers have an elastic limit of more than 1%, the polymer FBG accelerometer can measure very strong accelerations. We compare with corresponding silica FBG accelerometers and demonstrate that using polymer FBGs improves the sensitivity by more than a factor of four and increases the figure of merit, defined as the sensitivity times the resonance frequency squared.
- Fiber Bragg grating
- Optical fiber sensor
- Polymer optical fiber
Stefani, A., Andresen, S., Yuan, W., Herholdt-Rasmussen, N., & Bang, O. (2012). High Sensitivity Polymer Optical Fiber-Bragg-Grating-Based Accelerometer. I E E E Photonics Technology Letters, 24(9), 763-765. https://doi.org/10.1109/LPT.2012.2188024