METHOD AND DEVICE FOR MEASURING THE TEMPERATURE OF A MOLTEN METAL BATH

摘要

The invention relates to a method for measuring a temperature of a molten metal bath by means of an optical fibre surrounded by a cover. The optical fibre is immers ed in the molten bath and the radiation absorbed by the optical fibre in the molten ba th is fed to a detector, wherein the optical fibre is heated when immersed in the molten bath. The heating curve of the optical fibre has at least one point P(t0, T0), wherein the increase .DELTA.T1 in the temperature T of the optical fibre over the time .DELTA.t in a first time interval t0-.DELTA.t up to the temperature T0 is smaller than the increase .DELTA.T2 in the temperature of the optical fibre over the time .DELTA.t in an immediately following second time interval t0+.DELTA.t.