A power-referenced fiber-optic accelerometer is proposed by using a weakly tilted fiber Bragg grating (TFBG) combined with a lateral-misaligned splice structure. The recoupling of lower-order cladding modes (ghost modes), excited by the TFBG, to the fiber core via a slightly lateral-offset slice is sensitive to vibration and can be unambiguously determined by monitoring the power change in reflection, avoiding complex wavelength interrogation. However, the Bragg resonance is virtually unaffected by fiber bending and it can be used as a power reference to cancel out any light source fluctuations. Combining with a polymer tube package, the novel sensing configuration presents a linear and reproducible response for acceleration measurement.

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20th International Conference on Optical Fibre Sensors
Department of Electronics

Guo, T, Shao, L.-Y, Au, H. (Hoyin), Tam, H.-Y. (Hwa-Yaw), & Albert, J. (2009). Tilted fiber Bragg grating-based accelerometer. Presented at the 20th International Conference on Optical Fibre Sensors. doi:10.1117/12.834936