pH induced switching in hydrogel coated fiber Bragg grating sensor

B. N. Shivananju; Manish K. Priydarshi; D. Roy Mahapatra; G. M. Hegde; S. Asokan

doi:10.1117/12.2009620

12 April 2013 pH induced switching in hydrogel coated fiber Bragg grating sensor

B. N. Shivananju, Manish K. Priydarshi, D. Roy Mahapatra, G. M. Hegde, S. Asokan

Proceedings Volume 8598, Bioinspired, Biointegrated, Bioengineered Photonic Devices; 85980O (2013) https://doi.org/10.1117/12.2009620
Event: SPIE BiOS, 2013, San Francisco, California, United States

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.

Citation Download Citation

B. N. Shivananju, Manish K. Priydarshi, D. Roy Mahapatra, G. M. Hegde, and S. Asokan "pH induced switching in hydrogel coated fiber Bragg grating sensor", Proc. SPIE 8598, Bioinspired, Biointegrated, Bioengineered Photonic Devices, 85980O (12 April 2013); https://doi.org/10.1117/12.2009620

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