This paper describes the principles and general operating characteristics of ultrasonic cross-correlation flowmeters for liquids and gases. A great deal of research is currently proceeding to determine the performance of these instruments when measuring different types of fluids, but the general form of results are given for various flow systems. Since there is no restriction to flow and the measurement is largely independent of the fluid properties there is a great deal of interest in applying the technique in industry when suitable ‘peak-seeking’ correlators become available.
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