Measuring and testing – Volume or rate of flow – System
Patent
1975-01-03
1976-10-26
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
73560, G01F 166
Patent
active
039876748
ABSTRACT:
Transducers are positioned on opposite sides of a fluid conduit and are longitudinally displaced from one another along the axis of the conduit. Each transducer contains a transmitting and receiving transducer element which produces output energy in a direction represented by a ray forming an angle to the axis of the flow conductor, such that the sine of the angle is equal to the ratio of the velocity of sound in the transducer body supporting the transducer crystal to the shear mode sound velocity in the conduit walls of the conduit conducting the fluid. The longitudinal spacing between the centers of the transducers on opposite sides of the conduit is such that it intercepts a sonic beam passing through the liquid. The sine of the angle of that beam passing through the fluid within the conduit and between the transducers makes with a line normal to the axis of the pipe, equals the ratio of the velocity of sound in the liquid to the pipe shear mode velocity of sound in the conduit. A novel mounting clamp and spacing strip is provided to automatically adjust the longitudinal spacing between the transducers and to ensure that the transducers can be securely clamped to the pipe without displacing the transducers during the clamp tightening process. The rear of the transduer crystals is covered with damping layers to damp out the trailing portions of the transmitted signal. The flow display computer associated with the transducers is arranged to count clock pulses during transmission upstream between the transducers and then during transmission downstream between the transducers. The difference in the number of pulses counted is then proportional to the velocity of the fluid within the conduit. The difference in pulse count may be previously compensated for by changes in the sonic beam angle due to possible changes in the liquid sound velocity so as to eliminate any dependence on sonic velocity in the resultant flow velocity computation.
REFERENCES:
patent: 2844961 (1958-07-01), Hedrich et al.
patent: 2912856 (1959-11-01), Kritz
patent: 3237453 (1966-03-01), Yamamoto et al.
patent: 3575050 (1971-04-01), Lynnworth
patent: 3782193 (1974-01-01), Meyer et al.
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