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AssigneeAVL List GmbH
InventorsMario Kupnik, Andreas Schröder, Michael Wiesinger, Klaus-Christoph Harms
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An ultrasonic gas flowmeter includes a measuring pipe with flowing gas, transmitting and receiving sound transducers, transmission and reception electronics, and evaluation electronics. The sound transducers (7, 8, 9, 10) are designed as capacitive electro-acoustic ultrasonic transducers to construct a flowmeter with improved capacity, especially in view of temperature stability and the reduction and consideration of a temperature profile. Devices (5, 6) are provided to level the gas temperature profile and to minimize the influence of the temperature profile on the flow measurement. A more accurate and dependable detection of the volume flow or the mass flow of gases is to be achieved, especially in highly dynamic flows, for the method of determining the flow of gases whereby the mean flow velocity is determined and the flowing gas quantity is determined with highly synchronized resolution from the two transit times of two acoustic signals. In addition, an assessed value is computed (35) for the flow after the determination of the transit times and the assessed value is corrected at least by means of a characteristic temperature of the gas and the temperature of the wall of the measuring pipe (36).
An ultrasonic gas flowmeter using the transit time process, comprising a measuring pipe with flowing gas, at least one transmitting sound transducer and one receiving sound transducer, as well as transmission and reception electronics, wherein the sound transducers are designed as capacitive ultrasonic transducers for the generation of sound as well as for the reception of time transient sound signals, and devices to level the gas temperature profile of the flow, and to minimize the influence of the temperature profile on the flow measurement.
A method to determine the flow of gases, whereby the mean flow velocity is determined and whereby the flowing quantity of gas is determined with a highly synchronized resolution from the transit time of the acoustic signals between transmitter and receiver, wherein an assessed value is calculated for the flow after the determination of acoustic transit times and said assessed value is then corrected at least by means of a characteristic temperature of the gas and the temperature in the pipe wall.
Dependencies are inferred from the claim text.