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Optical Engineering

Hydrogel-coated fiber Bragg grating sensor for pH monitoring
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Paper Abstract

We present a fiber-optic wavelength-modulated sensor for pH applications. Fiber Bragg grating (FBG) is functionalized with a stimulus-responsive hydrogel that induces a strain on FBG due to mechanical expansion of the gel in response to ambient pH changes. The gel is synthesized from the blends of poly (vinyl alcohol)/poly (acrylic acid). The induced strain results in a shift of FBG reflected peak that is monitored by an interrogator. The sensor system shows good linearity in the acidic pH range of 3 to 7 with a sensitivity of 12.16  pm/pH. In addition, it shows good repeatability and oscillator behavior, which proves it to be fit for pH sensing applications.

Paper Details

Date Published: 20 June 2016
PDF: 7 pages
Opt. Eng. 55(6) 066112 doi: 10.1117/1.OE.55.6.066112
Published in: Optical Engineering Volume 55, Issue 6
Show Author Affiliations
Vayu Nandana Kishore Pabbisetti, National Institute of Technology, Warangal (India)
Sai Shankar Madhuvarasu, National Institute of Technology, Warangal (India)

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