Flowmeter

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G - Physics

01

F

349/39

G01F 1/66 (2006.01)

Patent

CA 1171515

C. A. Watson - 18 FLOWMETER ABSTRACT OF THE DISCLOSURE An ultrasonic flowmeter including two phase locked loops with four voltage controlled oscillators, a portion of each loop forming a common path through amplifiers, an electronic attenuator with automatic gain control, a pulse detector, and a pulse ox phase comparator. The pulse comparator, through switches, controls the voltage controlled oscillators on a time shared basis. The voltage controlled oscillators are always driven until a later counter pulse coincides 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. The oscillators are also alternated to eliminate a zero frequency shift by transmitting alternately at higher and lower frequencies from each transducer.

404717

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