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Device for temperature compensation in an acoustic flow meter
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.ORCID iD: 0000-0002-4133-3317
(English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

A meter includes a casing (1) with a fluid passage (2), in which two transducer mountings (3, 4) arranged at a distance (Lb) from each other support two transducers (5, 6) which are acoustically opposed to each other. Between the transducers (5, 6) there is a distance (Lu) over which they transmit and receive sound pulses through a fluid which in a direction (a) flows through the fluid passage (2). On the basis of the transit times of the sound pulses over the distance (Lu) both countercurrently with and countercurrently to the direction of flow (a), e.g. the velocity of the flow of the fluid is then calculated. A compensating device (8, 9) is arranged between at least one of the transducers (5, 6) and one of the transducer mounts (3, 4). The compensating device (8, 9) is made of a material having a known function of thermal expansion and having such a length that a longitudinal change, caused by a change in temperature of the fluid, of the distance (Lb) between the transducer mounts (3, 4) and, thus, of the distance (Lu) between the transducers (5, 6) is essentially compensated for by an opposite longitudinal change of the compensating device (8, 9).

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-36858Local ID: 54343d70-d873-11db-a1bf-000ea68e967bOAI: oai:DiVA.org:ltu-36858DiVA: diva2:1010305
Patent
US US6532828, WO0026618 (A1), EP1135670 (A1), EP1135670 (A0), SE9803750 (L), SE512920 (C2) (2003-03-18)
Note

Godkänd; 2003; 20060926 (ysko)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-09-15Bibliographically approved

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