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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 21 — Oct. 13, 2008
  • pp: 16854–16859

Hybrid fiber gratings coated with a catalytic sensitive layer for hydrogen sensing in air

Christophe Caucheteur, Marc Debliquy, Driss Lahem, and Patrice Mégret  »View Author Affiliations

Optics Express, Vol. 16, Issue 21, pp. 16854-16859 (2008)

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Using hydrogen as fuel presents a potential risk of explosion and requires low cost and efficient leak sensors. We present here a hybrid sensor configuration consisting of a long period fiber grating (LPFG) and a superimposed uniform fiber Bragg grating (FBG). Both gratings are covered with a sensitive layer made of WO3 doped with Pt on which H2 undergoes an exothermic reaction. The released heat increases the temperature around the gratings. In this configuration, the LPFG favors the exothermic reaction thanks to a light coupling to the sensitive layer while the FBG reflects the temperature change linked to the hydrogen concentration. Our sensor is very fast and suitable to detect low hydrogen concentrations in air whatever the relative humidity level and for temperatures down to -50 °C, which is without equivalent for other hydrogen optical sensors reported so far.

© 2008 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.1480) Optical devices : Bragg reflectors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: August 11, 2008
Revised Manuscript: September 12, 2008
Manuscript Accepted: September 29, 2008
Published: October 7, 2008

Christophe Caucheteur, Marc Debliquy, Driss Lahem, and Patrice Megret, "Hybrid fiber gratings coated with a catalytic sensitive layer for hydrogen sensing in air," Opt. Express 16, 16854-16859 (2008)

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