Fiber optic ion sensors based on phase fluorescence lifetime measurements

Richard B. Thompson

doi:10.1117/12.144743

18 May 1993 Fiber optic ion sensors based on phase fluorescence lifetime measurements

Richard B. Thompson

Proceedings Volume 1885, Advances in Fluorescence Sensing Technology; (1993) https://doi.org/10.1117/12.144743
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Fiber optic sensors for various chemical species are well known in the literature, the majority of which are based on changes in fluorescence intensity or intensity ratios due to the presence of the analyte. Recently, several workers have demonstrated analyses based on fluorescence lifetimes. Fluorescence lifetime measurements were performed through a single optical fiber using a modified phase fluorometer. Results are shown indicating that pH could be accurately measured under these conditions with commercially available indicators and instrumentation. The basis of lifetime sensing in the frequency domain is discussed, together with the origin of the very large dynamic ranges achievable with the technique: greater than 100,000-fold analyte concentration range using a single indicator without multiple equilibria.

Citation Download Citation

Richard B. Thompson "Fiber optic ion sensors based on phase fluorescence lifetime measurements", Proc. SPIE 1885, Advances in Fluorescence Sensing Technology, (18 May 1993); https://doi.org/10.1117/12.144743

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