Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1981-05-01
1983-11-29
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
044174810
ABSTRACT:
Apparatus for measuring the speed of flow of a flowable medium by determining the transit time of sound waves therein wherein first and second sound transmitter/receivers in the form of electroacoustic converters are spaced apart in the medium with an imaginary line joining said first and second transmitter/receivers having a component in the direction of the flow to be measured and wherein sound pulses of predetermined length are alternately transmitted in a first direction from said first transmitter/receiver to said second transmitter/receiver and in a second direction opposite to said first direction from said second transmitter/receiver to said first transmitter/receiver said sound pulses being converted into electrical measurement pulses on arrival at said transmitter/receivers there being processing circuitry for processing electrical measurement pulses to determine the speed of flow from the transit times of the sound pulses in said first and second directions, said processing circuitry including means for precluding from the determination electrical measurement pulses which do not conform to an expected pattern as a result of electrical or acoustic disturbances.
REFERENCES:
patent: 3818757 (1974-06-01), Brown
patent: 3918304 (1975-11-01), Abruzzo et al.
patent: 4028938 (1977-06-01), Eck
patent: 4069713 (1978-01-01), Gassmann
patent: 4183244 (1980-01-01), Kohno et al.
Erwin Sick GmbH - Optik-Elektronik
Ruehl Charles A.
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