Title :
Miniature pH sensor based on optical fiber Fabry-Perot interferometer
Author :
Yangzi Zheng ; Xinyong Dong ; Kai Ni ; Chi Chiu Chan ; Shum, Perry Ping
Author_Institution :
Inst. of Optoelectron. Technol., China Jiliang Univ., Hangzhou, China
Abstract :
An optical fiber Fabry-Perot interferometer (FPI) coated with polyvinyl alcohol/poly-acrylic acid (PVA/PAA) hydrogel is proposed for pH value measurement. The FPI is formed by splicing a section of hollow-core photonic crystal fiber (HCPCF) between two standard single mode fibers. Its optical path different is modulated by the coated PVA/PAA hydrogel sensing film through swelling effect which depends on pH value of the tested solution. High sensitivity up to 11nm/pH is achieved within the pH value range between pH 4.1 and pH 6.9.
Keywords :
Fabry-Perot interferometers; chemical sensors; fibre optic sensors; holey fibres; hydrogels; photonic crystals; hollow-core photonic crystal fiber; hydrogel sensing film; optical fiber Fabry-Perot interferometer; pH sensor; pH value measurement; polyvinyl alcohol/poly-acrylic acid hydrogel; single mode fibers; swelling effect; Cavity resonators; Films; Optical fiber sensors; Optical fibers; Optical interferometry; Fabry-Perot interferometer; Poly acrylic acid; Polyvinyl alcohol; optical fiber pH sensor;
Conference_Titel :
Advanced Infocomm Technology (ICAIT), 2014 IEEE 7th International Conference on
Conference_Location :
Fuzhou
Print_ISBN :
978-1-4799-5454-4
DOI :
10.1109/ICAIT.2014.7019552
