Optical fiber Fabry-Perot interferometer with pH sensitive hydrogel film for hazardous gases sensing

Yangzi Zheng; Li Han Chen; Chi Chiu Chan; Xinyong Dong; Jingyi Yang; Zhi Qiang Tou; Ping Lam So

doi:10.1117/12.2194772

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28 September 2015 Optical fiber Fabry-Perot interferometer with pH sensitive hydrogel film for hazardous gases sensing

Yangzi Zheng, Li Han Chen, Chi Chiu Chan, Xinyong Dong, Jingyi Yang, Zhi Qiang Tou, Ping Lam So

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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 963467 (2015) https://doi.org/10.1117/12.2194772
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

An optical fiber Fabry-Perot interferometer (FPI) coated with polyvinyl alcohol/poly-acrylic acid (PVA/PAA) hydrogel film for toxic gases measurement has been developed. Splicing a short section of hollow core fiber between two single mode fibers forms the FPI. Dip-coated pH-sensitive PVA/PAA hydrogel film on the fiber end performs as a receptor for binding of volatile acids or ammonia, which makes the sensing film swelling or shrinking and results in the dip wavelength shift of the FPI. By demodulating the evolution of reflection spectrum for various concentrations of volatile acids, a sensitivity of 20.8 nm/ppm is achieved with uniform linearity.

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Yangzi Zheng, Li Han Chen, Chi Chiu Chan, Xinyong Dong, Jingyi Yang, Zhi Qiang Tou, and Ping Lam So "Optical fiber Fabry-Perot interferometer with pH sensitive hydrogel film for hazardous gases sensing", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963467 (28 September 2015); https://doi.org/10.1117/12.2194772

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