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Proceedings Paper

Fiber optic ion sensors based on phase fluorescence lifetime measurements
Author(s): Richard B. Thompson
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Paper 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.

Paper Details

Date Published: 18 May 1993
PDF: 10 pages
Proc. SPIE 1885, Advances in Fluorescence Sensing Technology, (18 May 1993); doi: 10.1117/12.144743
Show Author Affiliations
Richard B. Thompson, Univ. of Maryland/Baltimore School of Medicine (United States)

Published in SPIE Proceedings Vol. 1885:
Advances in Fluorescence Sensing Technology
Joseph R. Lakowicz; Richard B. Thompson, Editor(s)

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