20 June 2016 Hydrogel-coated fiber Bragg grating sensor for pH monitoring
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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.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Vayu Nandana Kishore Pabbisetti, Vayu Nandana Kishore Pabbisetti, Sai Shankar Madhuvarasu, Sai Shankar Madhuvarasu, } "Hydrogel-coated fiber Bragg grating sensor for pH monitoring," Optical Engineering 55(6), 066112 (20 June 2016). https://doi.org/10.1117/1.OE.55.6.066112 . Submission:
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