G - Physics – 01 – F
Patent
G - Physics
01
F
349/39
G01F 1/66 (2006.01) G01F 1/86 (2006.01)
Patent
CA 1105605
ABSTRACT OF THE DISCLOSURE A flowmeter for accurately determining the rate of flow of a gas substantially independent of its molecular composition and also for determining a measure of the velocity of sound in that gas. The gas flows through a transducer assembly. Disposed in the transducer are two cylindrical transducers each capable of producing or responding to acoustic compressions in the gas. The transducers are alternately switched between transmitting and receiving with one transducer at a given instant being used to transmit and the other to receive. The phase difference between the transmitted and the received signal for two successive transmit-receive cycles are stored with the difference between two successive stored phase differences indicating the magnitude and the direction of fluid flow and the sum of the stored phase differences providing a measurement of the velocity sound in that gas. The flowmeter includes circuitry for automatically compen- sating for changes in gas composition so that the indicated flow rate is correct at all times.
297492
Hall Lawrence G.
Loveland Robert S.
Osler Hoskin & Harcourt Llp
Perkin-Elmer Corporation The
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