Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1998-12-18
2000-09-05
McCall, Eric S.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
061126012
ABSTRACT:
The invention relates to a method of measuring the flow rate of a flowing fluid on the basis of two ultrasonic signals transmitted consecutively in mutually opposite directions between two ultrasonic transducers. In the method, n clock signals CK.sub.i, where i=1 to n, that are at mutual phase offsets of 2.pi.
are formed, the first clock signal, referenced CLS, that occurs immediately after a characteristic portion the first received ultrasonic signal SIG.sub.1 appears is identified and stored, the time t.sub.1 is determined that corresponds to the sum, over an integer number m of consecutive periods, of the times elapsed between the instant at which the characteristic portion of each of the m periods of the signal SIG.sub.1 appears, and the instant at which the following signal CLS appears, likewise, for the signal SIG.sub.2 received in the opposite direction, the time t.sub.2 is determined that corresponds to the sum, over m consecutive periods, of the times elapsed between the instant at which the characteristic portion of each period appears and the instant at which the following signal CLS appears, the difference .vertline.t2-t1.vertline. is taken, and the flow rate is deduced therefrom.
REFERENCES:
patent: 5052230 (1991-10-01), Lang et al.
patent: 5178018 (1993-01-01), Gill
McCall Eric S.
Pojunas Leonard W.
Schlumberger Industries S.A.
Thompson Jewel V.
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