Skip to Content
Find More Like This
Return to Search

Processing data, for improved, accuracy, from device for measuring speed of sound in a gas

United States Patent

September 19, 2006
View the Complete Patent at the US Patent & Trademark Office
A method, used in connection with a pulse-echo type sensor for determining the speed of sound in a gas, for improving the accuracy of speed of sound measurements. The sensor operates on the principle that speed of sound can be derived from the difference between the two-way travel time of signals reflected from two different target faces of the sensor. This time difference is derived by computing the cross correlation between the two reflections. The cross correlation function may be fitted to a parabola whose vertex represents the optimum time coordinate of the coherence peak, thereby providing an accurate measure of the two-way time diffference.
Owen; Thomas E. (Helotes, TX)
Southwest Research Institute (San Antonio, TX)
10/ 894,084
July 19, 2004
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.