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Proceedings Paper

Distributed fiber optical sensing of molecular oxygen with OTDR
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Paper Abstract

Spatially resolved sensing of molecular oxygen is important for many biological and environmental applications. For this purpose, time-resolved fluorescence measurements were combined with optical time domain reflectometry (OTDR), a technique which was primarily developed for inspections of optical fiber lines. To achieve spatial resolution of some meters, which are typical for commercial OTDR instruments, the lifetimes of the sensor dyes must be within the range of some nanoseconds, which is much shorter than the decay times of common phosphorescent oxygen probes. Therefore, the measurements were performed with a novel fluorescent triangular-[4]phenylene sensor dye. The fluorescence decay times are around 80 ns in absence of oxygen and around 20 ns in the presence of air. The [4]phenylene sensor dye was applied in toluene solution as well as immobilized in a polymer film. Using a branched model fiber line, oxygen measurements were carried out in a micro- to millimolar concentration range. Oxygen-dependent fluorescence decay times measured with OTDR in toluene were verified by use of time-correlated single photon counting (TCSPC). The Stern-Volmer plots obtained for fluorescence quenching of sensor dyes dissolved in toluene solution and polymer-based sensor spots show good linearity.

Paper Details

Date Published: 13 May 2010
PDF: 8 pages
Proc. SPIE 7726, Optical Sensing and Detection, 77260A (13 May 2010); doi: 10.1117/12.854240
Show Author Affiliations
Susanne Eich, Univ. Potsdam (Germany)
Elmar Schmälzlin, Univ. Potsdam (Germany)
Hans-Gerd Löhmannsröben, Univ. Potsdam (Germany)

Published in SPIE Proceedings Vol. 7726:
Optical Sensing and Detection
Francis Berghmans; Anna Grazia Mignani; Chris A. van Hoof, Editor(s)

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