Electrode configuration for LIMCA
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Accused Products
Abstract
The present invention provides a method and apparatus for reducing electromagnetic noise pick up in a Liquid Metal Cleanliness Analyzer (LiMCA), used to detect and measure particles in molten metal. An first electrode inserted in the molten metal is electrically insulated from second and third electrodes, also inserted in the molten metal. Molten metal and particles pass between the first electrode and the second and third electrodes through a passage in the electrical insulation. The second and third electrodes have a configuration with respect to the first electrode sufficient to establish symmetrical current loops between the first electrode and the second and third electrodes when a current is supplied to the second and third electrodes. The current is supplied from an ultra-capacitor. Electromagnetic noise in the symmetrical current loops is detected and is added in opposition to reduce the amplitude of the electromagnetic noise.
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Citations
3 Claims
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1. (canceled)
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2. A method of making substantially continuous measurements in a Liquid Metal Cleanliness Analyzer (LiMCA), having a body of molten metal containing particles, electrically insulating wall means having a passage formed therein for passage of the molten metal, a first electrode inserted in the molten metal on one side of the wall means and at least one additional electrode inserted in the molten metal on an opposite side of the wall means to the first electrode and voltage recording means connected between the first electrode and the at least one additional electrode, said method comprising:
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a) supplying current at an initial predetermined level to the first electrode and to the at least one additional electrode to create a current loop between the at least one additional electrode and the first electrode, said current loop generating a wanted pulse signal that is recorded by the voltage recording means, and wherein said current is supplied from a current source comprising an ultra-capacitor; b) monitoring the change in the current from said ultra-capacitor; and c) providing a means for rapidly re-adjusting the current output to said predetermined level while said voltage recording means is temporarily prevented from recording the wanted pulse signal.
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3-5. -5. (canceled)
Specification