Patent ID: 7197199
Filing Date: 2007-03-27
Classification: G01J,G01K

Abstract:
1. A method for calibration of measurement signals and for measuring a temperature in a melt by optical fibers, comprising the steps of arranging a reference material with a known reference temperature at one end of an optical fiber, immersing the optical fiber with the reference material at the one end in the melt to be measured to heat the reference material up to at least its reference temperature, wherein the reference temperature of the reference material is less than a melting-point temperature of the melt to be measured, feeding a signal received by the fiber when the reference temperature is reached as a calibration signal to a measurement device, comparing the signal with a theoretical value for the reference temperature in the measurement device, using any difference from the comparison for calibration, and after the calibration maintaining the optical fiber immersed in the melt to be measured and evaluating an obtained optical and/or electrical signal as a value of the temperature of the melt.