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

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

Author Affiliations +

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.

Citation Download Citation

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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