CO2 sensing at atmospheric pressure using fiber Fabry-Perot interferometer

Wenwen Ma; Yelu He; Yangfan Zhao; Shilei Shen; Ruohui Wang; Xueguang Qiao

doi:10.1117/12.2265608

16 May 2017 CO₂ sensing at atmospheric pressure using fiber Fabry-Perot interferometer

Wenwen Ma, Yelu He, Yangfan Zhao, Shilei Shen, Ruohui Wang, Xueguang Qiao

Proceedings Volume 10231, Optical Sensors 2017; 102311Q (2017) https://doi.org/10.1117/12.2265608
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

A Fabry–Perot interferometer (FPI) for CO₂ gas sensing at atmospheric pressure is proposed and experimentally demonstrated. The gas sensing material is poly(ethyleneimine) (PEI)/poly(vinylalcohol) (PVA) compound, which exhibits reversible refrative index change upon absorption and release of CO₂ gas molecules. The FPI is fabricated by coating a PEI/P VA film with a thickness of 15μm film at the end face of a single-mode fiber (SMF). A well-confined interference spectrum with fringe contrast of 19.5 dB and free spectra range (FSR) of 33.15 nm is obtained. The proposed FPI sensor is sensitive to the CO₂ gas concentration change, and a sensitivity of 0.2833nm/PCT is obtained. The FPI sensor provides a solution in the development of low-cost and compact gas sensors for CO₂ leakage monitoring.

Citation Download Citation

Wenwen Ma, Yelu He, Yangfan Zhao, Shilei Shen, Ruohui Wang, and Xueguang Qiao "CO₂ sensing at atmospheric pressure using fiber Fabry-Perot interferometer", Proc. SPIE 10231, Optical Sensors 2017, 102311Q (16 May 2017); https://doi.org/10.1117/12.2265608

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