Ultrasonic flow meter

Details Ultrasonic flow meter Ultrasonic flow meter

1984-07-18

1986-09-16

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166

Patent

active

046114963

ABSTRACT:
In an ultrasonic flow meter in which an ultrasonic transducer for transmission and an ultrasonic transducer for reception are arranged so as not to be opposite to each other, so that the flow rate is measured from the flow rate dependency of the phase difference of the ultrasonic wave in the fluid and the distance between said ultrasonic transducers, (1) the ultrasonic flow meter being provided with an oscillator wherein the frequency of the ultrasonic wave is controlled in correspondence with said phase difference in order to make it possible to measure when the phase difference is not smaller than 0-.pi., and (2) the ultrasonic flow meter also being provided with an electric circuit to compensate the measurement error due to the variance of the acoustic velocity of the ultrasonic wave in the fluid.

REFERENCES:
patent: 2921467 (1960-01-01), Hedrich et al.
patent: 4372167 (1983-02-01), Loveland

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