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Proceedings Paper

Remote flammable-gas sensing using a fluoride-fiber evanescent probe
Author(s): Vincent P. Ruddy; Brian D. MacCraith; Simon P. McCabe
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Paper Abstract

Evanescent wave spectroscopy at 3.3gm on the surface of the core of an IR transmitting fluoride fibre is used to detect the concentration of flammable gases such as propane or methane in the environment of the fibre. Three probe designs are discussed. In one the gas diffuses through the teflon cladding of a multimode fibre causing an attenuation of the evanescent field and thereby a reduction in transmittance of the fibre. In the second a short section of cladding is removed from multimode fibre to access the evanescent field region. In the third singlemode fibre is used with its cladding reduced locally by polishing. Referencing is carried out at non absorbing wavelengths in the 3.2 to 3.6pm region.

Paper Details

Date Published: 1 August 1990
PDF: 8 pages
Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); doi: 10.1117/12.20294
Show Author Affiliations
Vincent P. Ruddy, Dublin City Univ. (Ireland)
Brian D. MacCraith, Dublin City Univ. (Ireland)
Simon P. McCabe, Dublin City Univ. (Ireland)

Published in SPIE Proceedings Vol. 1267:
Fiber Optic Sensors IV
Ralf Th. Kersten, Editor(s)

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