Apparatus for the measurement of the fraction of gas in a...

Details Apparatus for the measurement of the fraction of gas in a... Apparatus for the measurement of the fraction of gas in a...

G - Physics

01

N

73/69

G01N 27/22 (2006.01) G01N 33/28 (2006.01)

Patent

CA 1236992

ABSTRACT 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 approx- imately equal to the potential occuring half way between the other two electrodes. The third electrode may be fed by a simple voltage divider through a buffer amplifier (F2), and the signal processing unit preferably comprises a sine wave generator and a charge amplifier (operational amplifier with capacitance feedback).

466771

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