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Indirect measurement of nitrogen in a multi-component gas by measuring the speed of sound at two states of the gas

United States Patent

October 12, 2004
View the Complete Patent at the US Patent & Trademark Office
A methods of indirectly measuring the nitrogen concentration in a gas mixture. The molecular weight of the gas is modeled as a function of the speed of sound in the gas, the diluent concentrations in the gas, and constant values, resulting in a model equation. Regression analysis is used to calculate the constant values, which can then be substituted into the model equation. If the speed of sound in the gas is measured at two states and diluent concentrations other than nitrogen (typically carbon dioxide) are known, two equations for molecular weight can be equated and solved for the nitrogen concentration in the gas mixture.
Morrow; Thomas B. (San Antonio, TX), Behring, II; Kendricks A. (Torrance, CA)
Southwest Research Institute (San Antonio, TX)
10/ 401,206
March 27, 2003
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this invention and the right in certain circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FC21-96MC33033 for the U.S. Department of Energy.