Device for precision measurement of speed of sound in a gas
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United States of America Patent
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Nov 30, 2004
Grant Date -
May 20, 2004
app pub date -
Apr 3, 2003
filing date -
Nov 18, 2002
priority date (Note) -
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Abstract
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.
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