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Device for precision measurement of speed of sound in a gas

United States Patent

November 30, 2004
View the Complete Patent at the US Patent & Trademark Office
A sensor for measuring the speed of sound in a gas. The sensor has a helical coil, through which the gas flows before entering an inner chamber. Flow through the coil brings the gas into thermal equilibrium with the test chamber body. After the gas enters the chamber, a transducer produces an ultrasonic pulse, which is reflected from each of two faces of a target. The time difference between the two reflected signals is used to determine the speed of sound in the gas.
Kelner; Eric (San Antonio, TX), Minachi; Ali (San Antonio, TX), Owen; Thomas E. (Helotes, TX), Burzynski, Jr.; Marion (Converse, TX), Petullo; Steven P. (Fairfax, VA)
Southwest Research Institute (San Antonio, TX)
10/ 406,518
April 3, 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.