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

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

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 hydrog...

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Bibliographic Details
Main Authors: Zheng, Yangzi, Chen, Li Han, Chan, Chi Chiu, Dong, Xinyong, Yang, Jingyi, Tou, Zhi Qiang, So, Ping Lam
Other Authors: Kalinowski, Hypolito J.
Format: Conference or Workshop Item
Language:English
Published: 2018
Subjects:
Optical Fiber
Polyvinyl Alcohol
DRNTU::Engineering::Chemical engineering
Online Access:https://hdl.handle.net/10356/88902
http://hdl.handle.net/10220/47001
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Institution: Nanyang Technological University
Language: English
Description
Summary: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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