Pulse train detection in transit time flowmeter

Details Pulse train detection in transit time flowmeter Pulse train detection in transit time flowmeter

1989-06-13

1992-06-02

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G06F 166

Patent

active

051176980

ABSTRACT:
A transit-time flowmeter transmits trains of ultrasonic pulses alternately upstream and downstream through a conduit having liquid flowing therein. Flow speed (fv) is a function of the total liquid travel time (t.sub.L) and the difference (.DELTA.t) between the upstream and downstream travel times. The timer t.sub.L is determined by transmitting a short setup pulse train, for example, 1-3 pulses, from one of the transducers. The time the short pulse train is received by the other transducer is taken to define an overall travel time t.sub.N. The known pulse travel time within the transducers and pipe walls is subtracted from the time t.sub.N, the result being the liquid travel time t.sub.L. To measure .DELTA.t, a longer measurement pulse train (Tx), for example 8-100 pulses, is transmitted alternately upstream and downstream. The phase difference is measured between the received (digitized) pulse train R.sub.D and a reference pulse train f.sub.D which is phase-coherent with the transmit signal Tx, and is controlled to be approximately 90.degree. out of phase with the received pulse train R.sub.D. Tx and f.sub.D are both derived from a common clock signal fm.

REFERENCES:
patent: 4098117 (1978-07-01), Baumoel
patent: 4232548 (1980-11-01), Baumoel
patent: 4452090 (1984-06-01), Kou et al.
patent: 4468971 (1984-09-01), Herzl et al.
patent: 4633719 (1987-01-01), Vander Heyden

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