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Title: Fiber optic pH sensor with self-assembled multilayer nanocoatings on tilted FBG
Authors: Shao, LY
Yin, MJ
Tam, HY 
Albert, J
Keywords: Fourier transform
Layer by layer
pH sensor
Polymeric coatings
Tilted fiber Bragg grating
Issue Date: 2012
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2012, v. 8421, 84216A How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
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).
Description: 22nd International Conference on Optical Fiber Sensors, Beijing, 15-19 October 2012
ISBN: 9780819491039
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.974898
Appears in Collections:Conference Paper

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