pH sensing by single and multi-layer hydrogel coated Fiber Bragg Grating

Shivananju, BN and Priydarshi, Manish Kr and Mahapatra, Roy D and Hegde, GM and Asokan, S (2012) pH sensing by single and multi-layer hydrogel coated Fiber Bragg Grating. In: 2012 1st International Symposium on Physics and Technology of Sensors (ISPTS), 7-10 March 2012, Pune, India.

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Abstract

In this paper we show a novel chemo-mechanical-optical sensing mechanism in single and multi-layer hydrogel coated Fiber Bragg Grating (FBG) and demonstrate specific application in pH activated processes. The sensing device is based on the ionizable monomers inside the hydrogel which reversibly dissociates as a function of the pH and consequently resulting in osmotic pressure difference between the gel and the solution. This pressure gradient causes the hydrogel to deform which in turn induces secondary strain on the FBG sensor resulting in shift in the Bragg wavelength. We also report on the sensitivity factor of single and multilayer hydrogel coated FBG at various different pH.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright of this article belongs to IEEE.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	10 Mar 2014 06:34
Last Modified:	10 Mar 2014 06:34
URI:	http://eprints.iisc.ac.in/id/eprint/48540

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