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US 3,940,731 AGranted
Ultrasonic random signal doppler flow measurement system
AssigneePurdue Research Foundation
InventorsGeorge R. Cooper, Vernon L. Newhouse
Life of this patent
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Abstract
A doppler effect flow measurement device using ultrasonic stationary random noise whereby errors and inaccuracies common in existing doppler flow measurement systems are overcome.
Claims7
A flow measurement device comprising:
- a stationary random noise source having an output signal in the ultrasonic range;
- a transmitter to transmit said output signal toward a target in a flowing medium, said target reflecting signals in said ultrasonic range;
- a delay means connected with said noise source to receive the output signal coupled to said transmitter;
- a receiver to receive said output signal when reflected back from said target;
- and
- signal processing means connected with said delay means and said receiver to receive the output therefrom and responsive thereto producing an output indicative of the frequency shift between said output signal as transmitted and received, said frequency shift being indicative of the flow rate of said medium.
3 more elements
A flow measurement device comprising:
- a stationary random noise source having an output signal in the ultrasonic range;
- a transducer operatively connected to said random noise source to transmit said output signal toward an ultrasonic range signal reflecting target and receive said output signal when reflected from said target when under movement;
- a delay circuit connected with said noise source to receive said output signal simultaneously with the transmission of said signal from said transducer;
- and
- signal processing means connected with said delay circuit and said transducer to receive said output signal and said reflected output signal therefrom, respectively, said signal processing means responsive to receiving said output signal and said reflected output signal producing an output that is indicative of the frequency shift between said signals, said frequency shift reflecting the rate of movement of said target.
2 more elements
Dependencies are inferred from the claim text.