Method and apparatus for the detection of slag co-flowing within a stream of molten metal

A method for the detection of the properties of slag co-flowing within a stream of molten metal comprising the steps of:

• (a) arranging first and second transmitter coils and one receiver coil so as to surround a flow section of the slag co-flowing with the stream of molten metal;
• (b) supplying a first current containing a plurality of frequencies to the first transmitter coil, the current inducing a voltage in the receiver coil;
• (c) selectively supplying a second current containing the plurality of frequencies to the second transmitter coil so as to also induce a voltage in the receiving coil;
• (d) processing the induced voltages at the plurality of frequencies to produce output signals corresponding to each of the plurality of frequencies;
• (e) controlling the amplitude and phase of current components of the second current at the plurality of frequencies in accordance with the output signals;
• and
• (f) detecting the proportion of slag co-flowing within the stream of molten metal in accordance with the output signals.

An apparatus for the detection of the proportion of slag co-flowing within a stream of molten metal comprising:

• (a) two series connected transmitter coils arranged so as to surround a flow section of the slag co-flowing with the stream of molten metal;
• (b) two series connected receiver coils arranged so as to also surround said flow section;
• (c) a current generator circuit for supplying a current containing a plurality of frequencies to said transmitter coils, said current inducing a voltage in said receiver coils;
• (d) a means for processing the induced voltage at the plurality of frequencies to produce output signals corresponding to each of the plurality of frequencies;
• (e) and a means for detecting the proportion of slag co-flowing within the stream of molten metal in accordance with said output signals.

An apparatus for the detection of the proportion of slag co-flowing within a stream of molten metal comprising:

• (a) first and second transmitter coils and one receiver coil, said coils arranged so as to surround a flow section of said slag co-flowing with the stream of molten metal;
• (b) a current means for supplying a first current containing a plurality of frequencies to said first transmitter coil, said current inducing a voltage in said receiver coil;
• (c) a means for selectively supplying a second current containing said plurality of frequencies to said second transmitter coil so as to also induce a voltage in said receiving coil;
• (d) a means for processing said induced voltages at said plurality of frequencies so as to produce output signals corresponding to each of said plurality of frequencies;
• (e) a controlling means for controlling the amplitude and phase of current components of said second current at said plurality of frequencies in accordance with said output signals;
• and
• (f) a means for detecting the proportion of slag co-flowing within said stream of molten metal in accordance with said output signals.