Fiber optic pH sensor with sol-gel films

Jan Rayss; Grzegorz Sudolski

doi:10.1117/12.497733

14 April 2003 Fiber optic pH sensor with sol-gel films

Jan Rayss, Grzegorz Sudolski

Proceedings Volume 5028, Optical Fibers and Their Applications VIII; (2003) https://doi.org/10.1117/12.497733
Event: Optical Fibers and Their Applications VIII, 2002, Bialowieza, Poland

Abstract

The influence of surface properties of sol-gel derived silica on pH sensing is presented. It is observed that the surface charge of silica, caused by pH change, leads to absorption of cations on the porous silica surface. As a consequence, one can observed an increase of refractinve index of the sol-gel material, hence, its optical properties and light propagation conditions. Since the effect is pH-dependent and its magnitude is so strong, it can even be exploited for pH sensing. Theoretical considerations correlate with results of surface charge and optical properties of a model of pH sensor measurements.

Citation Download Citation

Jan Rayss and Grzegorz Sudolski "Fiber optic pH sensor with sol-gel films", Proc. SPIE 5028, Optical Fibers and Their Applications VIII, (14 April 2003); https://doi.org/10.1117/12.497733

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