Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1980-07-18
1982-03-30
Kreitman, Stephen A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
043218350
ABSTRACT:
An apparatus for measuring fluid flow velocity includes an oscillation generator triggered by a circuit driver and a receiver which are disposed in oblique, opposed relation with respect to the direction of flow of the fluid, and an analyzing circuit for the determination of the transit time of the oscillations through the fluid, which analyzing circuit is made up by an exclusive OR-circuit connected on the input side of the receiver and to the oscillation generator operating with constant frequency and constructed as a square-wave impulse generator, a low-pass filter following it, and circuit means for detecting the differential value between a reference voltage and the voltage at the low-pass filter. The apparatus measures the phase-shift between the emitted and received signals, as a result of which a high accuracy is achieved even in case of short measuring distances and the apparatus can be constructed at very low costs.
REFERENCES:
patent: 3981191 (1976-09-01), Brown et al.
patent: 4011755 (1977-03-01), Pedersen et al.
Alex Friedmann Kommanditgesellschaft
Kreitman Stephen A.
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