Ultrasonic flow sensor with quadrature demodulation

Details Ultrasonic flow sensor with quadrature demodulation Ultrasonic flow sensor with quadrature demodulation

2008-03-05

2009-12-29

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

Reexamination Certificate

active

07637171

ABSTRACT:
An ultrasonic flow sensor, in particular for determining the flow velocity of a medium flowing through a pipeline, has at least one ultrasonic converter for transmitting and/or receiving ultrasonic signals, an oscillator, which is connected with the ultrasonic converter, and an evaluation unit, which determines a phase shift of the ultrasonic signal that was received, with respect to a reference signal. The evaluation unit includes a plurality of quadrature demodulators, which operate with different demodulation frequencies and each determine phase information about the ultrasonic signal that was received, and when a vernier unit is provided, which determines—based on the individual pieces of phase information—a phase angle or a quantity proportional thereto.

REFERENCES:
patent: 4155259 (1979-05-01), Engeler
patent: 4324258 (1982-04-01), Huebscher et al.
patent: 6514205 (2003-02-01), Lee et al.

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