Nkk Corporation

Nireco Corporation

Masao Sugawara

Takeo Yamada

Kouichi Matsumoto

Akio Nagamune

Kouichi Tezuka

First and second electrodes are inserted into molten metal. A first pseudo random signal is transmitted to the first electrode, and at the same time the first pseudo random signal and a second pseudo random signal which has the same pattern as the first pseudo random signal but which is slightly different in frequency from the first pseudo random signal are multiplied by each other in a first multiplier to thereby calculate a first product value. A signal obtained from the second electrode and the second pseudo random signal are multiplied by each other in a second multiplier to thereby obtain a second product value. The displacement of the molten metal is calculated from the time difference between maximum correlation values respectively appearing in time series patterns of the first and second product values.

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Tokyo, Japan

Masao Sugawara