TU Darmstadt / ULB / TUbiblio

Effect of transducer port cavities in invasive ultrasonic transit-time gas flow meters

Hoffmann, Maik and Unger, Alexander and Jäger, Axel and Kupnik, Mario (2015):
Effect of transducer port cavities in invasive ultrasonic transit-time gas flow meters.
In: IEEE IUS 2015, Taipei, Taiwan, 21.10.2015-24.10.2015, [Conference or Workshop Item]

Abstract

The design of ultrasonic gas flowmeters (UFMs) requires a thorough characterization of the acoustic sound pressure field. For large pipe flowmeters, such as used for custody or flare gas metering, the transducers are operated at frequencies ranging from 20 kHz up to 150 kHz. Thus, we investigate the effect of various acoustic boundary conditions for a 40 kHz air– coupled ultrasonic transducer by varying the mounting position inside the transducer port cavity. We used a volumetric characterization system to measure the sound pressure field for various boundary conditions. A pipe section with a diameter of ten inch and two representative inclination angles for a single–path UFM are used. We observe a maximum bending of the main sound lobe up to 16 and a significant change of the shape from single to multiple lobes. Our results prove that the transducer port cavity has significant effects on the sound pressure field and that these effects need to be taken into account when a flowmeter is supposed to be designed properly in terms of a symmetric or intentionally non–symmetric sound propagation.

Item Type: Conference or Workshop Item
Erschienen: 2015
Creators: Hoffmann, Maik and Unger, Alexander and Jäger, Axel and Kupnik, Mario
Title: Effect of transducer port cavities in invasive ultrasonic transit-time gas flow meters
Language: English
Abstract:

The design of ultrasonic gas flowmeters (UFMs) requires a thorough characterization of the acoustic sound pressure field. For large pipe flowmeters, such as used for custody or flare gas metering, the transducers are operated at frequencies ranging from 20 kHz up to 150 kHz. Thus, we investigate the effect of various acoustic boundary conditions for a 40 kHz air– coupled ultrasonic transducer by varying the mounting position inside the transducer port cavity. We used a volumetric characterization system to measure the sound pressure field for various boundary conditions. A pipe section with a diameter of ten inch and two representative inclination angles for a single–path UFM are used. We observe a maximum bending of the main sound lobe up to 16 and a significant change of the shape from single to multiple lobes. Our results prove that the transducer port cavity has significant effects on the sound pressure field and that these effects need to be taken into account when a flowmeter is supposed to be designed properly in terms of a symmetric or intentionally non–symmetric sound propagation.

Uncontrolled Keywords: Air-Coupled, Transducer Port Cavities, 40 kHz Ultrasound, UFM, Ultrasonic Gas Flowmeter
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Measurement and Sensor Technology
18 Department of Electrical Engineering and Information Technology
Event Title: IEEE IUS 2015
Event Location: Taipei, Taiwan
Event Dates: 21.10.2015-24.10.2015
Date Deposited: 04 Nov 2015 13:44
Export:

Optionen (nur für Redakteure)

View Item View Item