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Proceedings Paper

Fiber optic pH sensor with self-assembled multilayer nanocoatings on tilted FBG
Author(s): L. Y. Shao; M. J. Yin; H. Y. Tam; J. Albert
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Paper Abstract

A novel fiber optic pH sensor is experimentally demonstrated by coating multilayers of poly(acrylic acid) (PAA) and poly(diallyldimethylammonium chloride) (PDDA) on a tilted fiber Bragg grating (TFBG) with the layer-by-layer (LbL) electrostatic self-assembly method. The utilization of PDDA/PAA pH sensitive polymeric coating presents a variation of the thickness with the pH of the solution, which introduces the wavelength shift and transmission change in the spectrum of TFBG. Using fast Fourier transform (FFT) analysis on a selected bandwidth of the transmission spectrum, it is found that the peak amplitude of the dominant spectral fringes increases with the increasing pH value with an near-linear sensitivity of 117 arbitrary unit (a.u.)/pH unit (in the range of pH 4.66 to pH 6.02). The dynamic response of the sensor also has been studied (10 s rise time and 18 s fall time)

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84216A (7 November 2012); doi: 10.1117/12.974898
Show Author Affiliations
L. Y. Shao, China Jiliang Univ. (China)
The Hong Kong Polytechnic Univ. (Hong Kong, China)
M. J. Yin, The Hong Kong Polytechnic Univ. (Hong Kong, China)
H. Y. Tam, The Hong Kong Polytechnic Univ. (Hong Kong, China)
J. Albert, Carleton Univ. (Canada)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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