Apparatus for measuring the speed of flow of flowable media

Details Apparatus for measuring the speed of flow of flowable media Apparatus for measuring the speed of flow of flowable media

1980-10-24

1983-06-28

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166

Patent

active

043898998

ABSTRACT:
The speed of a flowing medium is measured by determining the transit time of sound pulses transmitted alternately in opposite directions between first and second transmitter-receivers 23, 24 spaced apart in the direction of flow. A processing circuit 18, 19, 20 evaluates the speed of flow from the difference between the transit times in the two directions. The transit times in the two directions are measured by separate but identical first and second pulse circuits 11, 11'. Each pulse circuit includes a variable frequency generator 13 the frequency of which is so regulated by the transmitted pulse from the pulse generator 12 and the pulse E received from the associated transmitter-receiver that the reciprocal of its frequency is equal to the transit time in the associated direction. Delay circuitry 21 is able to delay the trigger pulse applied to the frequency generator 13 from the pulse generator 12 so as to take account of transit time errors in the apparatus.

REFERENCES:
patent: 3720105 (1973-03-01), Cirulis
patent: 3818757 (1974-06-01), Brown
patent: 3894431 (1975-07-01), Muston et al.
patent: 4003256 (1977-01-01), Donelan et al.
patent: 4069713 (1978-01-01), Gassmann
patent: 4162630 (1979-07-01), Johnson
"Versatile Flow Meter"-Ultrasonics, vol. 10, No. 5, Sep. 1977, p. 204.
"Ultrasonic Flow Meter for Meas. Pure & High Polluted Fluids"-Technisches Messen, 1979, vol. 3, pp. 113-116.
C. Knapp--Geshwindigkeits-und Mengenmessung "Utrashalls", 1958, pp. 1-40.

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