Apparatus for the measurement of the fraction of gas in a two component fluid flow

Abstract From the Canadian patent

An apparatus for the measurement of the fraction of gas in a two component flow comprising a liquid and a gas in mixture in par-, ticular a flowing oil/gas-mixture. The apparatus is based on the measurement of changes in the electrical capacitance across two electrodes at different potentials between which the two, component mixture is forced to flow. The electrodes form a primary sensor supplied by a signal processing unit. In addition to the electrodes, a third electrode, is provided enclosing the other two electrodes, and kept at a potential which is approximately equal to the potential occuring half way between the other two electrodes. The third electrode may be fed by a simple voltage …