Materials, Photonic Devices, and Sensors

Fiber-optic fast response pH sensor in fiber Bragg gating using intelligent hydrogel coatings

[+] Author Affiliations
Yu Lin, Weiping Liu

Jinan University, Department of Electronic Engineering, Building Nanhai, Guangzhou 510632, China

Jinan University, Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Room 517, Building Nanhai, Guangzhou 510632, China

Shun’er Chen, Mulan Wang

Jinan University, Department of Electronic Engineering, Building Nanhai, Guangzhou 510632, China

Opt. Eng. 54(5), 057107 (May 27, 2015). doi:10.1117/1.OE.54.5.057107
History: Received February 8, 2015; Accepted May 4, 2015
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Abstract.  In order to widen the measurement range of pH values, a pH sensor based on the deposition of intelligent hydrogel on the cladding of a fiber Bragg grating (FBG) is developed. The key material, i.e., intelligent hydrogel, which is mainly made from N-isopropylacrylamide and sodium alginate, can respond to pH changes within the range from 0 to 14. By means of a spiral coating under the condition of ultraviolet light, an uninterruptible spiral-coating-layer structure is constructed. This new craft creates a more sensitive hydrogel layer with an optimal overlay thickness. In addition, with the addition of poly ethylene glycols (PEGs) in the hydrogel, half the response time can be saved compared with the pH sensor without PEG. Experimental results have confirmed that the FBG-based pH sensor can realize the successful measurement of the entire range of pH values, showing fast response and high sensitivity.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Yu Lin ; Shun’er Chen ; Mulan Wang and Weiping Liu
"Fiber-optic fast response pH sensor in fiber Bragg gating using intelligent hydrogel coatings", Opt. Eng. 54(5), 057107 (May 27, 2015). ; http://dx.doi.org/10.1117/1.OE.54.5.057107


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