| 摘要 |
Method and apparatus for measuring the flow speed and the gas volume proportion of a stream of liquid metal wherein a magnetic probe is inserted into the stream of liquid metal and induces a first and second voltage according to Faraday's principle of induction in a first and second predetermined volume of the liquid metal stream, the time sequence of the first and second induction voltages due to speed fluctuations is detected as a measure for the flow speed by means of a first and second pair of electrodes at a known axial spacing L, the travel time tau of a predetermined volume of liquid metal from the first pair of electrodes to the second pair of electrodes is measured and the flow speed v = L/ tau determined therefrom, and that the induction voltage, which decreases in magnitude with increasing gas volume proportion, is used as a measure for the gas volume proportion in the stream of liquid metal.
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