Curvature sensing using an added-signal in a fiber optic cavity ring-down system

Susana O. Silva; P. Biswas; S. Bandyopadhyay; P. A. Jorge; M. B. Marques; O. Frazão

doi:10.1117/12.2194785

28 September 2015 Curvature sensing using an added-signal in a fiber optic cavity ring-down system

Susana O. Silva, P. Biswas, S. Bandyopadhyay, P. A. Jorge, M. B. Marques, O. Frazão

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96341G (2015) https://doi.org/10.1117/12.2194785
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

This work presents a fiber-optic Cavity Ring-Down (CRD) configuration using an added-signal for curvature sensing. An Optical Time-Domain Reflectometer (OTDR) was used to send impulses down into the fiber loop cavity, inside of which a long period grating (LPG) was placed to act as sensing device. The added-signal was obtained by the sum of several conventional CRD impulses, thus providing an improvement on the curvature sensitivity when compared to the conventional CRD signal processing. Sensitivity to applied curvature of 15.3 μs/m-1 was obtained. This result was found to be 20-fold the one obtained for the conventional CRD signal processing.

Citation Download Citation

Susana O. Silva, P. Biswas, S. Bandyopadhyay, P. A. Jorge, M. B. Marques, and O. Frazão "Curvature sensing using an added-signal in a fiber optic cavity ring-down system", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96341G (28 September 2015); https://doi.org/10.1117/12.2194785

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