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Title: An Ultrasonic Gas Flowmeter Using High Frequency Transducers And Correlation Technique
Author: P. Brassier, B. Hosten, F. Vulovic
Source: Flomeko 2000
Year Published: 2000
Abstract: The research activities carried out in the past years showed that in gas networks some constraints exist on the ultrasonic working frequency of flowmeters. The study of the transmission and the attenuation of the signal, and noise mechanisms gives us a defined suitable frequency range 1. Thereby, a working frequency of 500 kHz proves to be the most suitable to avoid noise effects. This frequency is above the noise level detected in gas pipelines. Moreover, the signal lost due to attenuation of ultrasound in gas is still negligible. In parallel, the use of this frequency allows the application of efficient numerical techniques of signal processing such as the correlation method. An initialisation process based on this method is developed for gas flowmeters. It provides low uncertainty on parameters involved in the flow measurement process.

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