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Proceedings Paper

Fiber optic Bragg grating sensors for hydrogen gas sensing
Author(s): Boonsong Sutapun; Massood Tabib-Azar; Alex A. Kazemi
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Paper Abstract

We report a new type of optical hydrogen sensor with a fiber optic Bragg grating (FBG) coated with palladium. The sensing mechanism in this device is based on the mechanical stress that is induced in the palladium coating when it absorbs hydrogen. The stress in the palladium coating stretches and shifts the Bragg wavelength of the FBG. Using FBGs with different wavelengths many such hydrogen sensor can be multiplexed on a single optical fiber. Operation of two multiplexing sensors is demonstrated. Moreover, hydrogen and thermal sensitivities of the senors were measured and calculated using a simple elastic model. Moreover, to quantify the amount of stress in the palladium film as a function of hydrogen concentration, a novel and very sensitive method was devised and used to detect deflections in a Pd-coated cantilever using an evanescent microwave probe. This stress was in the range of 5.26 - 8.59 X 107 Pa for H2 concentrations of 0.5 - 1.4% at room temperature, which is about three times larger than that found in the bulk palladium for the same range of H2 concentrations.

Paper Details

Date Published: 7 May 1999
PDF: 6 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347817
Show Author Affiliations
Boonsong Sutapun, Case Western Reserve Univ. (United States)
Massood Tabib-Azar, Case Western Reserve Univ. (United States)
Alex A. Kazemi, The Boeing Co. (United States)

Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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