Optical fibre PH sensor based on immobilized indicator

Defu Cai; Qiang Cao; JingHong Han; Jine Cai; YaTing Li; ZeMin Zhu; Jie Fan; Ning Gao

doi:10.1117/12.50038

1 August 1991 Optical fibre PH sensor based on immobilized indicator

Defu Cai, Qiang Cao, JingHong Han, Jine Cai, YaTing Li, ZeMin Zhu, Jie Fan, Ning Gao

Proceedings Volume 1572, International Conference on Optical Fibre Sensors in China OFS(C) '91; (1991) https://doi.org/10.1117/12.50038
Event: International Conference on Optical Fibre Sensors in China, 1991, Wuhan, China

Abstract

An optical fiber pH sensor which has the immobilized pH sensitive indicator dye reagents on the tip of the optical fiber has been studied. The probe is made by covalently immobilizing the phenol red, bromine phenol blue, or bromothymol blue on the polyacrylamide microsphere fixed by polyterafluoroethylene (PTFE) film. A gap between the dye and optical fiber was used to make the diffusion of the hydrogen ions easier. The parameters of the optical fiber pH sensor have been given completely. The ranges of measurement are 3.0 - 5.0 pH, 7.0 - 8.5 pH, and 8.0 - 10.0 pH for bromine phenol blue, phenol red, and bromothymol blue, respectively. The sensitivity is 66.6 mV/pH. The probe has a precision of better than 0.55 pH. The linear correlation coefficient is 0.999. The response time is 1 - 2 min. The hysteresis is 0.52%. The repeatability is 0.013 mV, while the stability is 0.015 pH/h.

Citation Download Citation

Defu Cai, Qiang Cao, JingHong Han, Jine Cai, YaTing Li, ZeMin Zhu, Jie Fan, and Ning Gao "Optical fibre PH sensor based on immobilized indicator", Proc. SPIE 1572, International Conference on Optical Fibre Sensors in China OFS(C) '91, (1 August 1991); https://doi.org/10.1117/12.50038

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