G - Physics – 01 – N
Patent
G - Physics
01
N
324/59
G01N 27/00 (2006.01) G01N 15/12 (2006.01) G01N 33/20 (2006.01)
Patent
CA 1328679
ABSTRACT OF THE DISCLOSURE The invention relates to apparatus of the kind disclosed in U.S. Patents Nos. 4,555,662 and 4,600,880 for on-line particle determination in molten metals, wherein a sample of molten metal is drawn through a calibrated bore while a steady current is established through the bore between two electrodes on opposite sides thereof. The passage of non-conducting particles through the passage produces pulses whose magnitude and rate indicate respectively their size and number per unit volume. The electrodes and their leads form an interference-receiving antenna so that the wanted test signal, whose signal/noise ratio is inherently low, is overlaid with interference from neighbouring sources, such as motors, fluorescent lamps and particularly induction furnaces. This unwanted interference is reduced by a cancellation signal produced by a cancellation antenna constituted by a similar pair of electrodes, either separate from the main current-carrying electrodes or having one of them in common. A four electrode configuration permits the diameter of the passage to be monitored continuously. A five electrode configuration has three electrodes separate from the current-carrying electrodes forming the two antennae and connected differentially. A further electrode if provided is used to reference the power supplies so as to minimize ground loops in the signal path.
600148
Alcan International Limited
Gowling Lafleur Henderson Llp
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