Wide-Range pH Sensor Based on a Smart-Hydrogel-Coated Long-Period Fiber Grating

Satyendra Kumar Mishra; Bing Zou; Kin Seng Chiang

doi:10.1109/JSTQE.2016.2629662

Author(s)

Satyendra Kumar Mishra
Bing Zou
Kin Seng Chiang

Related Research Unit(s)

Department of Electrical Engineering

Detail(s)

Original language	English
Article number	7745946
Journal / Publication	IEEE Journal on Selected Topics in Quantum Electronics
Volume	23
Issue number	2
Online published	16 Nov 2016
Publication status	Published - Mar 2017

Link(s)

DOI	DOI https://doi.org/10.1109/JSTQE.2016.2629662 Final Published version
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Attachment(s)	Documents 11823886.pdf Post-print, 485 KB, PDF Publisher's Copyright Statement © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Mishra, S. K., Zou, B., & Chiang, K. S. (2017). Wide-Range pH Sensor Based on a Smart-Hydrogel-Coated Long-Period Fiber Grating. IEEE Journal on Selected Topics in Quantum Electronics, 23(2), [7745946]. https://doi.org/10.1109/JSTQE.2016.2629662.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85008425650&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(77f7d835-cc55-45bb-86f3-a001a6ccd18c).html

Abstract

We report a fiber-optic sensor for pH measurement, which is a long-period fiber grating (LPFG) coated with smart hydrogel. When the pH of a solution that surrounds the hydrogel coating changes, the volume of the coating and hence its refractive index are changed, which results in a shift in the resonance wavelength of the LPFG. Our experimental sensor shows a sensitivity of ∼0.66 nm/pH over the pH range from 2 to 12 and a response time of less than 2 s. The effects of the refractive index of the surrounding solution and temperature variations on the sensor are also measured.