Patent · US Active

Ultrasonic flow sensor with quadrature demodulation

US7637171B2 · kind B2 · utility

3Cited by

3References

11Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Jiawei Zhang · Sunnyvale, US
Bernhard Opitz · Leonberg, DE
Michael Horstbrink · Kornwestheim, DE
Tobias Lang · Stuttgart, DE
Axel Wenzler · Rottweil, DE

Key dates

Filing date	Mar 5, 2008
Grant date	Dec 29, 2009
Priority date	—
Expiry date	Jul 4, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG01F1/667
WIPO fieldMeasurement
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.