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SYSTEM FOR SUPERSONIC MEASUREMENT OF FLOW RATE OF FLOWING MEDIUM
SYSTEM FOR SUPERSONIC MEASUREMENT OF FLOW RATE OF FLOWING MEDIUM
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机译:流动介质超声测量系统
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摘要
Ultrasonic signals are transmitted alternately upstream and downstream in a fluent media. A reference signal timed to occur at the estimated time of arrival of the alternate signals is used to ascertain whether the actual signals arrive earlier or later than the reference signal. Control circuitry responsive to the early and late signals generates two signal levels associated with transmission direction which adjusts the time position of the reference signal until it coincides with the actual arrival times. One signal level is related to flow velocity. The other signal level is related to sound velocity in the fluent media.
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