Fiber optic pH sensor with self-assembled multilayer nanocoatings on tilted FBG

L. Y. Shao; M. J. Yin; H. Y. Tam; J. Albert

doi:10.1117/12.974898

7 November 2012 Fiber optic pH sensor with self-assembled multilayer nanocoatings on tilted FBG

L. Y. Shao, M. J. Yin, H. Y. Tam, J. Albert

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)

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available