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.
We propose a micro Fabry-Perot cavity fabricated by chemical etching a microstructure fiber. The microstructure fiber we use is an all silica endless single-mode fiber, whose core is surrounded by a group of air holes. A suspended core in the cladding can be created by removing the surrounded air hole usinghydrofluoric acid. The sensing head is fabricated by splicing a short section microstructure fiber with single mode fiber and submit the fiber end to chemical etching. The temperature sensitivity of the proposed sensor is 14.3pm/°C.
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