Structure optimization of air-hole fibers for high-sensitivity fiber Bragg grating pressure sensors

Charles Jewart; Di Xu; Kevin P. Chen; John Canning

doi:10.1117/12.785914

16 May 2008 Structure optimization of air-hole fibers for high-sensitivity fiber Bragg grating pressure sensors

Charles Jewart, Di Xu, Kevin P. Chen, John Canning

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70041Z (2008) https://doi.org/10.1117/12.785914
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

This paper presents sensitivity enhancement of fiber Bragg grating sensors written in two hole fibers to external hydrostatic pressure. Finite element analysis was used to optimize the size, diameter, and configuration of air holes. The fiber core was then fabricated in the region with the maximum birefringence induced by external pressure. Resonant peak splitting of fiber Bragg gratings were used to gauge the external hydrostatic pressures. By using 220-μm diameter two hole fibers with 90-μm air holes, the optimized fiber structure with a fiber core fabricated on the edge of the air hole registered 0.102 pm/psi hydrostatic pressure response, yielding 6.5 times enhancement than previously reported in two hole fibers. The sensitivity enhancement of fiber sensors is further demonstrated by controlling the size of air holes.

Citation Download Citation

Charles Jewart, Di Xu, Kevin P. Chen, and John Canning "Structure optimization of air-hole fibers for high-sensitivity fiber Bragg grating pressure sensors", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70041Z (16 May 2008); https://doi.org/10.1117/12.785914

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