Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1996-06-12
1998-05-19
Dougherty, Elizabeth L.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
364510, G01F 166
Patent
active
057538247
ABSTRACT:
An ultrasonic flowmeter for bidirectionally measuring the rate of flow of a fluid. Two spatially separated ultrasonic transducers alternately transmit and receive bursts of ultrasonic drive pulses through a fluid to be measured. A reference signal generator generates, for said bursts of drive pulses, reference transitions which occur controllable times after the beginnings of the bursts. A sampling signal generator generates sampling signals that define a plurality of sampling windows for use in timing the transitions of the received signal. The timing of the reference transition is dynamically adjusted so that the transitions of the received signal remain within respective sampling windows.
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Dougherty Elizabeth L.
Welch Allyn Inc.
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