Application of a fluorescence intensity ratio technique for the intrinsic determination of pH using an optical fiber sensor

Bhadra Thotath; T. Hien Nguyen; Weiwei Zhang; Stephen P. Wren; Gregory W. Baxter; Tong Sun; Stephen F. Collins; Kenneth T. V. Grattan

doi:10.1117/12.2195314

28 September 2015 Application of a fluorescence intensity ratio technique for the intrinsic determination of pH using an optical fiber sensor

Bhadra Thotath, T. Hien Nguyen, Weiwei Zhang, Stephen P. Wren, Gregory W. Baxter, Tong Sun, Stephen F. Collins, Kenneth T. V. Grattan

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96344M (2015) https://doi.org/10.1117/12.2195314
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

An intensity ratio technique has been used for characterizing fluorescence spectra from novel coumarin dyes for pH sensing, in the range of 0.5 – 6, providing results that are independent of possible fluctuations in the intensity of the excitation source, deterioration of the indicator and changes in optical coupling. The arrangement was determined to have a sensitivity of 25% per unit pH change (at a pH of 4).

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Bhadra Thotath, T. Hien Nguyen, Weiwei Zhang, Stephen P. Wren, Gregory W. Baxter, Tong Sun, Stephen F. Collins, and Kenneth T. V. Grattan "Application of a fluorescence intensity ratio technique for the intrinsic determination of pH using an optical fiber sensor", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96344M (28 September 2015); https://doi.org/10.1117/12.2195314

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