Miniature pH Optical Fiber Sensor Based on Fabry-Perot Interferometer

A polyvinyl alcohol (PVA)/poly-acrylic acid (PAA) hydrogel coated fiber-optic intrinsic Fabry-Perot interferometer (IFPI) has been demonstrated as a pH sensor. The proposed Fabry-Perot pH interferometric sensor consists of a section of hollow-core photonic crystal fiber (HCPCF) sandwiched between th...

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Veröffentlicht in:	IEEE journal of selected topics in quantum electronics 2016-03, Vol.22 (2), p.331-335
Hauptverfasser:	Zheng, Yangzi, Chen, Li Han, Dong, Xinyong, Yang, Jingyi, Long, Hui Yi, So, Ping Lam, Chan, Chi Chiu
Format:	Artikel
Sprache:	eng
Schlagworte:	Cavity resonators Fabry Perot interferometers Fiber optic sensor hydrogel in-line interferometer Optical fiber sensors Optical fibers Optical interferometry pH sensor polymer coating Sensitivity Temperature sensors
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Zusammenfassung:	A polyvinyl alcohol (PVA)/poly-acrylic acid (PAA) hydrogel coated fiber-optic intrinsic Fabry-Perot interferometer (IFPI) has been demonstrated as a pH sensor. The proposed Fabry-Perot pH interferometric sensor consists of a section of hollow-core photonic crystal fiber (HCPCF) sandwiched between the lead-in single mode fiber (SMF) and sensing SMF. The principle of the proposed sensor is based on the swelling effect of PVA/PAA hydrogel sensing film at the tip of sensing SMF, which induces optical path modulation when exposed to varying pH solutions. The pH sensor exhibits a relatively high sensitivity of 11 nm/pH ranging from the value of 4.1 to 6.9 with good repeatability and stability.
ISSN:	1077-260X 1558-4542
DOI:	10.1109/JSTQE.2015.2497438