Method for the optical temperature determination of a molten metal and unwinding device for carrying out such a method

摘要

Method for the optical temperature determination of a molten metal (10) with a measuring device comprising - an optical waveguide (6) for guiding electromagnetic radiation emitted by the metal (10) or the tip of the optical waveguide (6) to an optical detector (11), At least one spare optical waveguide (7), an optical detector (11) for determining the temperature of the metal from an analysis of the electromagnetic radiation, a measuring chain in which the optical waveguide (6) is the measuring transducer, at least one spare measuring chain, in which the replacement optical waveguide (7) is the measured value sensor, characterized by calibration of the replacement measuring chain by means of the measuring chain as an intrinsic standard, whereby the replacement measuring chain and the measuring chain record the same measured variable.