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Proceedings Paper

PH sensor using fiber Bragg grating based on swelling of hydrogel
Author(s): Xiaohua Lei; Bo Dong; Jianmin Gong; Anbo Wang; Weimin Chen
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Paper Abstract

To achieve pH detection of multi-points, a new pH sensor based on pH sensitive hydrogel swelling detection by a fiber Bragg grating is proposed. The deflection of a silica membrane due to pH value change induced hydrogel swelling is measured by the center wavelength shifts of a fiber Bragg grating epoxied on the membrane. The relation between center wavelength shifts of the fiber Bragg grating with the hydrogel swelling behavior was studied experimentally. Around 100pm shift of the fiber Bragg grating center wavelength was observed when the pH value was changed from 4 to 7 or from 7 to 10 by using pH standard solutions, which fundamentally proved the feasibility of this method for pH detection.

Paper Details

Date Published: 30 November 2012
PDF: 6 pages
Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 856111 (30 November 2012); doi: 10.1117/12.999513
Show Author Affiliations
Xiaohua Lei, Chongqing Univ. (China)
Virginia Polytechnic Institute and State Univ. (United States)
Bo Dong, Virginia Polytechnic Institute and State Univ. (United States)
Jianmin Gong, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)
Weimin Chen, Chongqing Univ. (China)


Published in SPIE Proceedings Vol. 8561:
Advanced Sensor Systems and Applications V
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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