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Proceedings Paper

Hydrogen detection using a transmission-based optical fibre sensor in the VIS spectrum
Author(s): Kevin Gleeson; Elfed Lewis
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Paper Abstract

Results are presented for a transmission based optical fibre hydrogen sensor using a thin film layer of Palladium as the sensing element. The thin palladium film was deposited onto a glass substrate via thermal vacuum evaporation. The sensor was tested by exposing the palladium film to 5% Hydrogen gas in a Nitrogen atmosphere. The absorption and desorption of hydrogen causes the optical properties of palladium to change depending on the concentration of hydrogen present in the atmosphere. Using a deuterium/halogen light source in conjunction with a UV/VIS spectrometer the changes in the optical transmittance in the visible spectra of the Pd film was monitored for 5% hydrogen in a nitrogen atmosphere. A comparison of different wavelengths in the VIS spectrum is presented. The response and recovery time for the sensor is shown to be 4-5 seconds and 35 seconds respectively. The sensor is capable of responding to changes of up to 15% and the sensor shows good repeatability to continuous exposure cycles to 5% hydrogen using nitrogen as the carrier and recovery gas.

Paper Details

Date Published: 2 July 2007
PDF: 4 pages
Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 66191I (2 July 2007); doi: 10.1117/12.738409
Show Author Affiliations
Kevin Gleeson, Univ. of Limerick (Ireland)
Elfed Lewis, Univ. of Limerick (Ireland)


Published in SPIE Proceedings Vol. 6619:
Third European Workshop on Optical Fibre Sensors

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