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Optical Engineering

Feasibility Of Using Fiber Optics For Monitoring Groundwater Contaminants
Author(s): Tomas Hirschfeld; Terrence Deaton; Fred Milanovich; Stanley Klainer
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Paper Abstract

The use of remote analysis techniques over optical fibers for underground water sampling is considerably less expensive (and offers faster and more complete analysis) than the conventional borehole fields containing sampling devices. The technology is based on fluorometric analysis, combining long range communication fiber optics, laser excitation, and Raman spectroscopic measurement technology. Detection at up to 1000 m range of ppb quantities of fluorescent dye tracers, and ppm quantities of heat and radiation stable tracers, with ~1% qualitative accuracy, has been accomplished. For nonfluorescent compounds, or for mixtures too complex for the intrinsic selectivity of fluorescence, specific compound optrodes (by analogy to electrodes) are used at the fiber tip. These contain immobilized reagents which become fluorescent or whose fluorescence is altered by the sample (reversibly for continuous measurements or irreversibly for cumulative ones).

Paper Details

Date Published: 1 October 1983
PDF: 5 pages
Opt. Eng. 22(5) 225527 doi: 10.1117/12.7973192
Published in: Optical Engineering Volume 22, Issue 5
Show Author Affiliations
Tomas Hirschfeld, Lawrence Livermore National Laboratory (United States)
Terrence Deaton, Air Force Academy (United States)
Fred Milanovich, Lawrence Livermore National Laboratory (United States)
Stanley Klainer, Kelsius Inc. (United States)

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