Patent ID: 7891867
Filing Date: 2011-02-22
Classification: G01J

Abstract:
1. A method for measuring a parameter of a molten steel bath by an optical fiber surrounded by a cover, the method comprising immersing the optical fiber in the molten steel bath, such that the optical fiber is heated when immersed in the molten steel bath, feeding the radiation absorbed by the optical fiber in the molten steel bath to a detector, and plotting the heating curve of the optical fiber to determine at least one point P(t 0 , T 0 ) where the increase ΔT 1 in a temperature T of the optical fiber over time Δt in a first time interval t 0 −Δt up to the temperature T 0 is smaller than an increase ΔT 2 in the temperature of the optical fiber over the time Δt in an immediately following second time interval t 0 +Δt, wherein the temperature T 0 of the optical fiber allocated to the point of time t 0 between the two time intervals is a maximum of 600° C.