Electrode configuration for LiMCA

摘要

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.

主权项

1. A liquid metal cleanliness analyzer comprising:
an insulating wall comprising a passage; a first electrode disposed proximate to a first side of the insulating wall; at least one additional electrode proximate to a second side of the insulating wall, wherein the second side is opposite of the first side; a computation apparatus; and a current supply system connected to the first electrode and to the at least one additional electrode, wherein:
the computation apparatus is configured to measure a voltage between the first electrode and the at least one additional electrode while liquid metal flows through the passage;when a current measured falls below a predetermined level, the liquid metal cleanliness analyzer is configured to suspend measurement of the voltage while the current supply system is adjusted to return the current to an initial value; andthe measurement is restarted after the current is returned to the initial value.