Heraeus Electro-nite International N.v.

Frank Seutens

Francis Dams

Robert Charles Whitaker

A method is provided for measuring a parameter of a molten metal bath by an optical fiber surrounded by a cover. The optical fiber is immersed in the molten bath, and the radiation absorbed by the optical fiber in the molten bath is fed to a detector, wherein the optical fiber is heated when immersed in the molten bath. The heating curve of the optical fiber has at least one point P(t, T), wherein the increase &#x394;Tin the temperature T of the optical fiber over the time &#x394;t in a first time interval t&#x2212;&#x394;t up to the temperature Tis smaller than the increase &#x394;Tin the temperature of the optical fiber over the time &#x394;t in an immediately following second time interval t+&#x394;t.

Temperature measuring method in molten metal bath

A method is provided for measuring a temperature of a molten metal bath by an optical fiber surrounded by a cover. The optical fiber is immersed in the molten bath, and the radiation absorbed by the optical fiber in the molten bath is fed to a detector, wherein the optical fiber is heated when immersed in the molten bath. The heating curve of the optical fiber has at least one point P(t, T), wherein the increase &#x394;Tin the temperature T of the optical fiber over the time &#x394;t in a first time interval t&#x2212;&#x394;t up to the temperature Tis smaller than the increase &#x394;Tin the temperature of the optical fiber over the time &#x394;t in an immediately following second time interval t+&#x394;t.

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Sint Huibrechts Lille, Belgium

Frank Seutens