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7 November 2012 Fiber optic pH sensor with self-assembled multilayer nanocoatings on tilted FBG
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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84216A (2012) https://doi.org/10.1117/12.974898
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China
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)
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Y. Shao, M. J. Yin, H. Y. Tam, and J. Albert "Fiber optic pH sensor with self-assembled multilayer nanocoatings on tilted FBG", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84216A (7 November 2012); https://doi.org/10.1117/12.974898
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