23 April 2017 Refractive index sensing using a multimode interference-based fiber sensor in a cavity ring-down system
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103232M (2017) https://doi.org/10.1117/12.2263437
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
This work presents a multimode interference-based fiber sensor in a cavity ring-down system for sensing temperature-induced refractive index (RI) changes of water. The sensing head is based in multimodal interference (MMI) and it was placed inside the fiber loop cavity of the CRD system. A modulated laser source was used to send pulses down into the fiber loop cavity and an erbium-doped fiber amplifier (EDFA) was placed in the fiber ring to provide an observable signal with a reasonable decay time. The behavior of the sensing head to temperature was studied due to its intrinsic sensitivity to said parameter — a sensitivity of -1.6×10-9 μs/°C was attained. This allowed eliminating the temperature component from RI measurement of water and a linear sensitivity of 580 μs/RIU in the RI range of 1.324–1.331 was obtained.
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Susana Silva, Susana Silva, Orlando Frazão, Orlando Frazão, } "Refractive index sensing using a multimode interference-based fiber sensor in a cavity ring-down system", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103232M (23 April 2017); doi: 10.1117/12.2263437; https://doi.org/10.1117/12.2263437
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