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Proceedings Paper

pH induced switching in hydrogel coated fiber Bragg grating sensor
Author(s): B. N. Shivananju; Manish K. Priydarshi; D. Roy Mahapatra; G. M. Hegde; S. Asokan
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Paper Abstract

In this paper we report a novel hydrogel functionalized optical Fiber Bragg Grating (FBG) sensor based on chemo-mechanical- optical sensing, and demonstrate its specific application in pH activated process monitoring. The sensing mechanism is based on the stress due to ion diffusion and polymer phase transition which produce strain in the FBG. This results in shift in the Bragg wavelength which is detected by an interrogator system. A simple dip coating method to coat a thin layer of hydrogel on the FBG has been established. The gel consists of sodium alginate and calcium chloride. Gel formation is observed in real-time by continuously monitoring the Bragg wavelength shift. We have demonstrated pH sensing in the range of pH of 2 to 10. Another interesting phenomenon is observed by swelling and deswelling of FBG functionalized with hydrogel by a sequence of alternate dipping between acidic and base solutions. It is observed that the Bragg wavelength undergoes reversible and repeatable pH dependent switching.

Paper Details

Date Published: 12 April 2013
PDF: 7 pages
Proc. SPIE 8598, Bioinspired, Biointegrated, Bioengineered Photonic Devices, 85980O (12 April 2013); doi: 10.1117/12.2009620
Show Author Affiliations
B. N. Shivananju, Indian Institute of Science (India)
Manish K. Priydarshi, Indian Institute of Science (India)
D. Roy Mahapatra, Indian Institute of Science (India)
G. M. Hegde, Indian Institute of Science (India)
S. Asokan, Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 8598:
Bioinspired, Biointegrated, Bioengineered Photonic Devices
Luke P. Lee; John A. Rogers; Seok-Hyun Yun, Editor(s)

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