Transmitting and receiving circuitry for an ultrasonic...

Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy

Reexamination Certificate

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Reexamination Certificate

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11139740

ABSTRACT:
A transmitting and receiving circuitry system for an ultrasonic flowmeter includes an ultrasound transducer interface for connection to an ultrasound transducer of the ultrasonic flowmeter, an amplifier with a first input and a second input, as well as a signal generator for activating the ultrasound transducer, with the first input of the amplifier connecting to the signal generator while the second input of the amplifier connects both to the ultrasound transducer interface and, via a feedback element, to the output of the amplifier. The impedance of the feedback element can be varied, permitting an adaptation of the transmitting and receiving circuitry to the operating mode of the ultrasonic flowmeter, in particular an adaptation to a transmitting or receiving mode, whereby an overall improvement of the signal-to-noise ratio is attainable. A method for operating such a system is also disclosed.

REFERENCES:
patent: 6584861 (2003-07-01), Jespersen
patent: 6947851 (2005-09-01), Jespersen
patent: 2005/0061085 (2005-03-01), Jesperson
patent: 02174837 (1990-07-01), None
European Search Report, European Patent Office, Jun. 7, 2006.

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