Pressure sensor based on an all-fiber Fabry-Pérot interferometer for different gaseous environments

Susana Silva; L. Coelho; O. Frazão

doi:10.1117/12.2025394

20 May 2013 Pressure sensor based on an all-fiber Fabry-Pérot interferometer for different gaseous environments

Susana Silva, L. Coelho, O. Frazão

Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87940H (2013) https://doi.org/10.1117/12.2025394
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland

Abstract

This work describes an all-fiber Fabry-Pérot interferometer (FFPI) that is sensitive to gas pressure variations. The geometry of the air cavity consists on splicing a small section of silica rod with a large offset in between two singlemode fibers. It is shown that the FFPI sensor is sensitive to gas pressure variation and when submitted to different gaseous environments, namely carbon dioxide, nitrogen and oxygen, it presented different sensitivities of 6.2, 4.1 and 3.6 nm/MPa, respectively. This result is obtained due to refractive index difference between gases. The refractive index change on nitrogen environment by means of the gas pressure variation resulted in a sensitivity of 1526 nm/RIU. The response of the sensing device to temperature in air was also determined and a sensitivity of -14 pm/°C was attained.

Citation Download Citation

Susana Silva, L. Coelho, and O. Frazão "Pressure sensor based on an all-fiber Fabry-Pérot interferometer for different gaseous environments", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87940H (20 May 2013); https://doi.org/10.1117/12.2025394

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