Acoustic flowmeter calibration method
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United States of America Patent
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Oct 24, 2006
Grant Date -
Jan 26, 2006
app pub date -
Jul 21, 2004
filing date -
Jul 21, 2004
priority date (Note) -
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Abstract
An acoustic flowmeter calibration method and sampling system address a variation in acoustic transducer delay time with increasing temperature. In one aspect, calibration of the path length between the sending and receiving transducers and calibration of the transducer delay time over a wide temperature range are optimized. In another aspect, the flowmeter output is temperature compensated based on the exhaust flowmeter gas temperature. These two aspects may be embodied in an ultrasonic flowmeter for exhaust gas measurement individually or in combination in accordance with the invention.
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