| 摘要 |
PURPOSE: To make possible an eddy current type current meter used for a conductive fluid, such as the molten steel from a continuous casting machine, etc., to accurately measure the flow velocity of the fluid by correcting gap variation. CONSTITUTION: A C-type core 1 is provided near molten steel 9 and an exciting coil 2 and gap variation detecting coil 3 are wound around the core 1 and connected to an AC power source 5 and amplifier 7. A magnetic flux detecting coil 4 is provided at the central part of the core 1 and inputs detecting signals to a correction circuit 8 through a phase rectifying circuit 6. When the coil 2 is excited, a magnetic fluxϕs is generated by an eddy current at each magnetic pole of the molten steel 9 and, as the molten steel 9 moves at a speed (V), a magnetic fluxϕv is generated at the central part of the core 1 owing to the movement of the magnetic fluxϕs . Since the magnetic fluxϕv is measured by means of the magnetic flux detecting coil 4 and the variation caused by the gap variation measured by the gap variation detecting coil 3 is corrected by means of the correction circuit 8, the flow velocity (v) of the molten steel 9 can be measured with accuracy.
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