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Proceedings Paper

Suitability of single-mode fluoride fibers for evanescent-wave sensing
Author(s): Brian D. MacCraith; Vincent P. Ruddy; Simon P. McCabe
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Paper Abstract

An investigation of the suitability of monomode fluoride glass fibers for the sensing of fluid concentration by evanescent wave absorption in the mid-infrared spectral region is reported. The test system consisted of a HeNe laser ((lambda) equals 3.39 micrometers ), a polished semi- coupler, and a cooled PbSe detector. Evanescent wave absorption in isopropanol was measured for a range of cladding overlayer thicknesses. Results are in broad agreement with the predictions of a theoretical model based on a planar waveguide structure under similar conditions. Calculations based on this model indicate that more elaborate sensor designs are required in order to achieve sufficient sensitivity for the sensing of gaseous species.

Paper Details

Date Published: 1 March 1992
PDF: 8 pages
Proc. SPIE 1587, Chemical, Biochemical, and Environmental Fiber Sensors III, (1 March 1992); doi: 10.1117/12.56560
Show Author Affiliations
Brian D. MacCraith, Dublin City Univ. (Ireland)
Vincent P. Ruddy, Dublin City Univ. (Ireland)
Simon P. McCabe, Dublin City Univ. (Ireland)

Published in SPIE Proceedings Vol. 1587:
Chemical, Biochemical, and Environmental Fiber Sensors III

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