G - Physics – 01 – F
Patent
G - Physics
01
F
349/39
G01F 1/66 (2006.01) G01P 5/24 (2006.01)
Patent
CA 1205898
ABSTRACT OF THE DISCLOSURE A procedure for measuring the flow velocity of a sus- pension by ultrasonic echo pulse technique. In the proce- dure, two or several ultrasonic transducers located at a dis- tance from each other are placed on the surface of the pipe subjected to measurement. From the transducers an ultra- sonic pulse is emitted through the pipe and an echo of the ultrasonic pulse is received after a time determined by the measuring depth. The echo pulses are received and a low fre- quency signal contained in them, caused by fibres or other particles in the suspension, is amplitude-detected. In the procedure is used a second or later echo from the rear wall of the measuring pipe in case a received echo is masked by the transmitted pulse. The signals derived from the trans- ducers are compared utilizing a correlation technique and in this way the flow velocity of the suspension that is to be measured is determined.
413676
Hewitt Neville S.
Sappel S.a.
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