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

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