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Title: Transient Diffraction Effects In Ultrasonic Meters For Volumetric, Mass And Energy Flow Measurement Of Natural Gas
Author: Per Lunde, Kjell Eivind, Frysa Remi, A. Kippersrud, Magne Vestrheim
Source: 2003 North Sea Flow Measurement Workshop
Year Published: 2003
Abstract: The influences of transducer diffraction effects on measured USM transit times are investigated, in relation to dry calibration methods and consequences for the USM measurement accuracy in flow calibration and field operation. Diffraction effects depend on a number of operational factors. The magnitude of such systematic effects is evaluated using a plane piston model and finite element modelling of the vibration and radiation of typical USM piezoelectric transducers. Consequences for volumetric, mass and energy flow measurement using USMs are evaluated.

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