Electrode configuration for LiMCA
First Claim
1. An apparatus for making measurements in a Liquid Metal Cleanliness Analyzer (LiMCA), having a body of molten metal containing particles, an electrically insulating unit having a passage formed therein for passage of the molten metal, the apparatus comprising:
- a first electrode positioned on one side of the electrically insulating unit;
at least one additional electrode inserted in the molten metal on an opposite side of the electrically insulating unit to the first electrode;
at least one voltage control resistor associated with the at least one additional electrode;
a voltage recording device connected between the first electrode and the at least one additional electrode; and
a current source configured to supply 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, the current loop generating a wanted pulse signal that is recorded by the voltage recording device,wherein the apparatus is configured to adjust the at least one voltage control resistor associated with the at least one additional electrode to re-adjust the current output to the predetermined level during the course of one measurement while the voltage recording device is temporarily prevented from recording the wanted pulse signal, thereby maintaining the supply of current at the predetermined level for a period of time required for the one measurement.
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Accused Products
Abstract
Disclosed is 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. A 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
20 Claims
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1. An apparatus for making measurements in a Liquid Metal Cleanliness Analyzer (LiMCA), having a body of molten metal containing particles, an electrically insulating unit having a passage formed therein for passage of the molten metal, the apparatus comprising:
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a first electrode positioned on one side of the electrically insulating unit; at least one additional electrode inserted in the molten metal on an opposite side of the electrically insulating unit to the first electrode; at least one voltage control resistor associated with the at least one additional electrode; a voltage recording device connected between the first electrode and the at least one additional electrode; and a current source configured to supply 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, the current loop generating a wanted pulse signal that is recorded by the voltage recording device, wherein the apparatus is configured to adjust the at least one voltage control resistor associated with the at least one additional electrode to re-adjust the current output to the predetermined level during the course of one measurement while the voltage recording device is temporarily prevented from recording the wanted pulse signal, thereby maintaining the supply of current at the predetermined level for a period of time required for the one measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of making measurements in a Liquid Metal Cleanliness Analyzer (LiMCA), having a body of molten metal containing particles, an electrically insulating unit having a passage formed therein for passage of the molten metal, a first electrode positioned on one side of the electrically insulating unit and at least one additional electrode inserted in the molten metal on an opposite side of the electrically insulating unit to the first electrode and a voltage recording device connected between the first electrode and the at least one additional electrode, the method comprising:
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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, the current loop generating a wanted pulse signal that is recorded by the voltage recording device; monitoring the change in the current; and adjusting the at least one voltage control resistor associated with the at least one additional electrode to re-adjust the current output to the predetermined level during the course of one measurement while the voltage recording device is temporarily prevented from recording the wanted pulse signal, thereby maintaining the supply of current at the predetermined level for a period of time required for the one measurement. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification