METHOD FOR DETERMINING A FLOW PROPERTY OF A FLUID FLOWING THROUGH A CONDUIT AND METHOD FOR PROVIDING CORRECTED CAPACITANCES IN SAID FLOW PROPERTY DETERMINING METHOD

摘要

A method for determining a flow property of a fluid flowing through a conduit (1) provided with a capacitance meter comprising an upstream and a downstream annular capacitance sensor (2a, 2b), wherein each annular capacitance sensor comprises at least three sensor electrodes (11a-13a, 11b-13b), which sensor electrodes are arranged around the circumference of the conduit, the method comprising selecting, for each annular capacitance sensor, a set of measurement capacitors, wherein a measurement capacitor is formed by two measurement electrodes, and wherein a measurement electrode consists either of a single sensor electrode or of at least two interconnected sensor electrodes; measuring at several moments during a time interval a capacitance of each measurement capacitor of each annular capacitance sensor (2a, 2b); determining cross correlations between capacitances measured during the time interval at the upstream annular capacitance sensor (2a) and capacitances measured during the time interval at the downstream annular capacitance sensor (2b); and determining the flow property from the cross correlations.