Flowmeter

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G - Physics

01

F

328/28, 349/39

G01F 1/66 (2006.01)

Patent

CA 1105606

ABSTRACT OF THE DISCLOSURE A flowmeter sometimes called ultrasonic, but sometimes not ultrasonic including two phase locked loops, a portion of each of which form a common path through amplifiers, an electronic attenuator with automatic gain control, a pulse detector, and a pulse or phase comparator. The pulse comparator, through switches, controls first and second voltage controlled oscilla- tors on a time shared basis. First and second counters are connected from the first and second voltage controlled oscilla- tors, respectively. The first and second counters supply trans- mission pulses to submerged first and second facing transducers, respectively, at different times. The voltage controlled oscillators are always driven until a later counter pulse coin- cides with a corresponding received pulse. Time sharing is, in part, accomplished by beginning energy propagation in opposite directions at successive times and before either pulse is received.

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