Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag
Patent
1985-01-15
1986-10-14
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring transit time of tracer or tag
7386132, G01F 132
Patent
active
046165096
ABSTRACT:
The disclosed apparatus includes novel fluid-flow detectors wherein a ball orbits along a circular track inside a wall that bears external piston-mode piezoelectric transducer means, the wall being of either plastic or metal. In one form of orbital-ball flow detector, the linear range of flow-versus-orbiting frequency is extended to lower flow rates by providing an inner track of the ball on a bearing member that is rotatable by the orbiting ball. The range of flow rates is also extended for an axial-flow detector having an orbital ball or a turbine-type rotor as the fluid-activated element by providing multiple subdivision passages having valves that close at successively lower main-passage flow rates, the subdivision passages having flow detectors whose outputs are combined to provide output that represents flow in the main passage.
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