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Theory for a gas composition sensor based on acoustic propertiesSound travelling through a gas propagates at different speeds and its intensity attenuates to different degrees depending upon the composition of the gas. Theoretically, a real-time gaseous composition sensor could be based on measuring the sound speed and the acoustic attenuation. To this end, the speed of sound was modelled using standard relations, and the acoustic attenuation was modelled using the theory for vibrational relaxation of gas molecules. The concept for a gas composition sensor is demonstrated theoretically for nitrogen-methane-water and hydrogen-oxygen-water mixtures. For a three-component gas mixture, the measured sound speed and acoustic attenuation each define separate lines in the composition plane of two of the gases. The intersection of the two lines defines the gas composition. It should also be possible to use the concept for mixtures of more than three components, if the nature of the gas composition is known to some extent.
Document ID
20040087499
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Phillips, Scott
(Broken Arrow OK 74012-2838, United States)
Dain, Yefim
Lueptow, Richard M.
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Measurement science & technology
Volume: 14
Issue: 1
ISSN: 0957-0233
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Life Sciences Technologies
Non-NASA Center

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