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Optical Engineering

Light-emitting-diode-based oxygen sensing using evanescent wave excitation of a dye-doped sol-gel coating
Author(s): Brian D. MacCraith; Gerard O'Keeffe; Aisling K. McEvoy; Colette M. McDonagh; John F. McGilp; Brendan O'Kelly; J. Des O'Mahony; Mark Cavanagh
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Paper Abstract

Two evanescent wave fiber optic sensors for oxygen are reported: one intensity based and the other based on phase fluorimetry. Both sensors employ the quenching by oxygen of the fluorescence from a ruthenium complex trapped in the cagelike structure of a sol-gel-derived porous film on a declad section of multimode optical fiber. The sensors exhibit excellent performance using excitation from new high brightness blue LEDs and establish the viability of low-cost portable sensor devices based on the 501-gel process.

Paper Details

Date Published: 1 December 1994
PDF: 6 pages
Opt. Eng. 33(12) doi: 10.1117/12.184360
Published in: Optical Engineering Volume 33, Issue 12
Show Author Affiliations
Brian D. MacCraith, Dublin City Univ. (Ireland)
Gerard O'Keeffe, Dublin City Univ. (Ireland)
Aisling K. McEvoy, Dublin City Univ. (Ireland)
Colette M. McDonagh, Dublin City Univ. (Ireland)
John F. McGilp, Trinity College (Ireland)
Brendan O'Kelly, Trinity College (Ireland)
J. Des O'Mahony, Trinity College (Ireland)
Mark Cavanagh, Trinity College (Ireland)


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