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Authors:
Meddy Vanotti
Virginie Blondeau-Patissier
David Rabus
Loic Richard
Sylvain Ballandras
Keywords: gas sensors; hydrogen; Palladium; SAW device; Rayleigh waves.
Abstract:
For an increasing number of application (energy production, car industry, space, etc.), hydrogen represents a solution of the future as it is the most common body in the Universe (and therefore on Earth). However, due to its unstable properties, a particular care must be dedicated to control possible gaseous leaks close to tanks and facilities using this resource. In this paper, surface acoustic wave sensors are proposed for detecting gaseous hydrogen in standard environmental conditions (atmospheric pressure and room temperature). The proposed SAW sensors consists in two Rayleigh-wave delay lines built on Quartz, one equipped with a Palladium overlay and the other exhibiting a free path between the two interdigitated transducers. A specific gas test cell has been developed to test various sensor configurations submitted to hydrogen-composed atmospheres. A particular care was paid to avoid hydrogen leakage in the working environment and to perform the regeneration of the gas absorbing layer. The developed device allows for identifying different concentrations of hydrogen (in the 1-4% range) diluted in N2 and is also able to detect H2 in current atmosphere. SAW devices exploiting hydrogen absorption capabilities of palladium thin films have been here used to make the detection and the identification of hydrogen concentrations in the 1-4% range and the influence of outer parameters such as temperature and relative humidity variations on the sensor operation is also reported.
Pages: 143 to 147
Copyright: Copyright (c) IARIA, 2012
Publication date: August 19, 2012
Published in: conference
ISSN: 2308-3514
ISBN: 978-1-61208-208-0
Location: Rome, Italy
Dates: from August 19, 2012 to August 24, 2012