Journal
OPTICS EXPRESS
Volume 20, Issue 20, Pages 21946-21952Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.021946
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Funding
- COST Action [TD1001]
- FCT - Fundacao para a Ciencia e Tecnologia [SFRH/BD/76965/2011]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/76965/2011] Funding Source: FCT
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A high sensitivity Fabry-Perot (FP) strain sensor based on hollow-core ring photonic crystal fiber was investigated. A low-finesse FP cavity was fabricated by splicing a section of hollow-core ring photonic crystal fiber between two standard single mode fibers. The geometry presents a low cross section area of silica enabling to achieve high strain sensitivity. Strain measurements were performed by considering the FP cavity length in a range of 1000 mu m. The total length of the strain gauge at which strain was applied was also studied for a range of 900 mm. The FP cavity length variation highly influenced the strain sensitivity, and for a length of 13 mu m a sensitivity of 15.4 pm/mu epsilon was attained. Relatively to the strain gauge length, its dependence to strain sensitivity is low. Finally, the FP cavity presented residual temperature sensitivity (similar to 0.81 pm/degrees C). (C) 2012 Optical Society of America
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