| 摘要 |
PCT No. PCT/EP85/00544 Sec. 371 Date Jun. 24, 1986 Sec. 102(e) Date Jun. 24, 1986 PCT Filed Oct. 17, 1985 PCT Pub. No. WO86/02583 PCT Pub. Date May 9, 1986.A method and an apparatus for the detection of slag co-flowing within a stream of molten steel being poured from metallurgical vessel, more particularly during continuous casting, makes it possible to detect even a small quantity of slag in the emerging flow of molten metal without requiring the removal of the shielding for the pouring stream, or without interfering with the pouring, by measuring changes in the electrical conductivity of the pouring system by means of electromagnetic fields. To this end, one or more transmitter coils and receiver coils are mounted fixedly around the pouring stream. The transmitter coils are fed with a current containing several frequencies, and the magnitude and phase position of the voltage induced in the receiver coils are evaluated frequency-selectively so as to increase the sensitivity, the measuring transducer being operated in a bridge circuit. The change in electrical conductivity of the pouring stream and, hence, the quantity of slag, are determined from the magnitude and phase position of the voltage induced in the measuring coils. Temperature-dependent errors are largely suppressed.
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