Importance

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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./n 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.

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First Claim