Processing data, for improved, accuracy, from device for...

Details Processing data, for improved, accuracy, from device for... Processing data, for improved, accuracy, from device for...

2006-09-19

2006-09-19

Chapman, John E. (Department: 2856)

Measuring and testing

Vibration

By mechanical waves

C073S602000, C702S054000

Reexamination Certificate

active

07107851

ABSTRACT:
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.

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International Search Report for PCT/US 03/36034, 5 pages, Mailed Oct. 5, 2004.

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