G - Physics – 01 – F
Patent
G - Physics
01
F
349/39
G01F 1/66 (2006.01) G01P 5/24 (2006.01) G06G 7/57 (2006.01) G06G 7/78 (2006.01)
Patent
CA 1099383
ABSTRACT OF THE DISCLOSURE The invention relates to apparatus for ultrasonically measuring physical parameters of flowing media. A measuring path has two ultrasonic converters with transmitting and re- ceiving devices being connected to the converters. The path has at least one component in the direction of flow and over which ultrasonic signals are sent alternately upstream and downstream. A comparator unit connected to the receiving device has an in- put for a reference signal from the control unit applied there- to at a predetermined time after the time of the transmitter starting signal. The comparator unit generates early or late signals when arrival signals from the receiving device come in earlier or later than the reference signal. A first signal level generator connected to said comparator unit produces a first main signal related to the velocity of sound in said media. A second signal level generator connected to the logic circuit for producing a second auxiliary signal related to the flow velocity of said media. A summating circuit has inputs con- nected to the first and second generators. Switch and re- versing amplifier units between the summating circuit and the second signal level generator are controlled by the auxiliary flow velocity signal to and from the summating cir- cuit to provide sum and difference outputs for the summating circuit.
284560
Danfoss A/s
Macrae & Co.
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