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A. Schröder, R. Reitinger, M. Kupnik, M. Gröschl, E. Benes:
"An ultrasonic flow-meter for determining the volume flow of gases in pipes at high temperatures";
in: "Proc. 1st Congress of Alps Adria Acoustics Association / 3rd Congress of Slovenian Acoustical Society", M. Cudina (Hrg.); Slovenian Acoustical Society, Portoroz/Slowenien, 2003, ISBN: 961-6238-73-6, S. 527 - 530.

A new method is suggested for measuring the volume flow of gases in pipes at elevated
temperatures of some hundred degrees Celsius, using ultrasonic waves generated and
detected by means of capacitance transducers. Hence, as common ultrasonic capacitance
transducers are made of materials not resistant against high temperatures, a special
transducer for this application has to be developed. Various materials for each component
of the transducer are investigated. Specific manufacturing processes for coating the
transducer backplates with different insulating materials are introduced, and the
experimental setup for the volume flow measurements is presented. Special attention is
paid to the investigation of different insulating materials, whether they can be used as
dielectrics during transducer operation. Furthermore, the mechanical stress between the
backplate and the coating material at elevated temperatures is considered.

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