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Proceedings Paper

Optical fiber Fabry-Perot interferometer with pH sensitive hydrogel film for hazardous gases sensing
Author(s): Yangzi Zheng; Li Han Chen; Chi Chiu Chan; Xinyong Dong; Jingyi Yang; Zhi Qiang Tou; Ping Lam So
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Paper 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.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963467 (28 September 2015); doi: 10.1117/12.2194772
Show Author Affiliations
Yangzi Zheng, China Jiliang Univ. (China)
Nanyang Technological Univ. (Singapore)
Li Han Chen, Nanyang Technological Univ. (Singapore)
Chi Chiu Chan, Nanyang Technological Univ. (Singapore)
Xinyong Dong, China Jiliang Univ. (China)
Jingyi Yang, China Jiliang Univ. (China)
Nanyang Technological Univ. (Singapore)
Zhi Qiang Tou, Nanyang Technological Univ. (Singapore)
Ping Lam So, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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