Digital liquid velocity measuring system

A - Human Necessities – 61 – B

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349/36, 349/39

A61B 10/00 (2006.01) A61B 8/06 (2006.01) G01F 1/66 (2006.01)

Patent

CA 1133112

ABSTRACT OF THE DISCLOSURE There is disclosed a liquid velocity measuring apparatus compris- ing an actuable generator for providing a relatively high frequency signal to a transmitting transducer for directing an ultrasonic wave into a conduit through which liquid is directed. A receiver transducer is disposed to receive the acoustical wave as reflected from the liquid, and to provide an output signal to be amplified and demodulated to provide a train of high frequency pulses, the frequency of which is indicative of the velocity of the liquid directed through the conduit. The train of pulses is applied to a counter and decoder for respectively counting and decoding the pulses to provide a signal to a display whereby a digital indication of the liquid velocity is given. Further, a timing circuit is provided for enabling the generator, the counter and the decoder for a first, relatively short period of time, made dependent upon the cross-sectional area (or diameter) of the conduit through which the liquid is directed, and for energizing the display for a second, relatively long period of time to permit reading of the dis- play.

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