Simultaneous measurement of refractive index and temperature based on multimode interference inside a fiber loop mirror

C. Gouveia; G. Chesini; J. M. Baptista; C. M. B. Cordeiro; P. A. S. Jorge

doi:10.1117/12.975281

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7 November 2012 Simultaneous measurement of refractive index and temperature based on multimode interference inside a fiber loop mirror

C. Gouveia, G. Chesini, J. M. Baptista, C. M. B. Cordeiro, P. A. S. Jorge

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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84216M (2012) https://doi.org/10.1117/12.975281
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A fiber optic sensor for simultaneous measurement of refractive index and temperature is presented. The sensing probe is achieved by introducing multimode interference inside a high birefringence fiber loop mirror resulting in a configuration capable of refractive index and temperature discrimination. The multimode interference peak is sensitive to the surrounding refractive index (90 nm/RIU) and slightly responsive to the temperature (0.005 nm/°C). On the other hand, the birrefringent fiber loop mirror is highly sensitive to temperature (2.39 nm/°C) and has no response to refractive index. Therefore, a temperature independent refractive index measurement can be made with a resolution of ±2.5x10^-5.

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C. Gouveia, G. Chesini, J. M. Baptista, C. M. B. Cordeiro, and P. A. S. Jorge "Simultaneous measurement of refractive index and temperature based on multimode interference inside a fiber loop mirror", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84216M (7 November 2012); https://doi.org/10.1117/12.975281

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