Lasers, Fiber Optics, and Communications

Hydrogel-coated fiber Bragg grating sensor for pH monitoring

[+] Author Affiliations
Vayu Nandana Kishore Pabbisetti, Sai Shankar Madhuvarasu

National Institute of Technology-Warangal, Department of Physics, Warangal 506004, Telangana State, India

Opt. Eng. 55(6), 066112 (Jun 20, 2016). doi:10.1117/1.OE.55.6.066112
History: Received January 1, 2016; Accepted May 27, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Vayu Nandana Kishore Pabbisetti and Sai Shankar Madhuvarasu
"Hydrogel-coated fiber Bragg grating sensor for pH monitoring", Opt. Eng. 55(6), 066112 (Jun 20, 2016). ; http://dx.doi.org/10.1117/1.OE.55.6.066112


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