An exploratory investigation, using laboratory fabricated acoustic components, of standinghyphen;wave flow measurement techniques for liquids and gases in pipes of diameter up to about 25 mm was undertaken, using long acoustic waves. The results show a linear sensitivity based on the lsquo;lsquo;singhyphen;aroundrsquo;rsquo; technique, often associated with contrapropagating timehyphen;ofhyphen;flight flowmeters. A repeatability test at a volume flow rate of 1.5lper minute indicates that, within the 95percnt; confidence limit, only 5percnt; of the readings will lie outside the range of 1.1ndash;1.9lper minute. The transducer used in the above investigation comprises a section of the pipe wall which acts as part of a resonating transmitter or detector of long waves in a fluid. The measurement cell is closed and generates a known standinghyphen;wave pattern. The results obtained suggest that, in the future, the initial accuracy obtained in this study can be significantly enhanced with further improvements to the transducers, the measurement cell, the electronics, and test procedures, on which work is continuing, to produce a device competitive with those using other technologies.
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