Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1979-03-01
1980-11-11
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73597, 364510, G01F 166
Patent
active
042325480
ABSTRACT:
A sonic flow meter for measuring the rate of flow of a fluid within an enclosed axially elongated hollow conduit is disclosed. First and second transducers are secured to the exterior surface of the conduit. The transducers are spaced from each other along the axis of the conduit such that the first transducer is located downstream from the second transducer with respect to the direction of flow of the fluid. Each of the transducers are adapted to transmit to each other, and receive from each other, sinusoidal sonic signals which pass through the fluid in the conduit. Sonic signal transmission means are provided for causing a plurality of sonic signals to be transmitted in an upstream direction from the first to the second transducer means and for causing an equal plurality of sonic signals to be transmitted in a downstream direction from the second to the first transducer means. Finally, a flow measurement circuit is provided for measuring the rate of flow of the fluid as a function of the difference in time it takes to transmit the sonic signals in the upstream and downstream directions. The flow measurement circuit determines the time difference by measuring the upstream and downstream transmission times with reference to a plurality of zero cross-over points of the transmitted sonic signals.
REFERENCES:
patent: 3869915 (1975-03-01), Baumoel
patent: 3987674 (1976-10-01), Baumoel
patent: 4022058 (1977-05-01), Brown
patent: 4028938 (1977-06-01), Eck
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