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pH Induced switching in hydrogel coated fiber bragg grating sensor

Shivananju, BN and Priydarshi, Manish K and Mahapatra, Roy D and Hegde, GM and Asokan, S (2013) pH Induced switching in hydrogel coated fiber bragg grating sensor. In: Conference on Bioinspired, Biointegrated, Bioengineered Photonic Devices, FEB 02-03, 2013, San Francisco, CA.

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Official URL: http://dx.doi.org/10.1117/12.2009620


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.

Item Type: Conference Poster
Series.: Proceedings of SPIE
Publisher: SPIE-Society of Photo-Optical Instrumentation Engineers
Additional Information: Copyright of this article belongs to SPIE-Society of Photo-Optical Instrumentation Engineers.
Keywords: Fiber Bragg Grating; Hydrogel; pH Sensing; Oscillation Behavior
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 22 Sep 2013 07:05
Last Modified: 22 Sep 2013 07:05
URI: http://eprints.iisc.ac.in/id/eprint/47273

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