An indirect, acoustic method to temperature in the melt is presented. This method uses the acoustic disturbance velocity in the gas phase as the information source for the thermal transformations occurring in the metal bath. Flow disturbances result from interaction between gas or plasma flows in the melt. Thus, the determined temperatures characterize the thermodynamic and energetic state of the melt. This information is used to calculate the thermodynamic, chemical, mass-exchange transformations occurring in the melt in real-time. Statistical analysis was applied to measurements obtained by thermocouples and the acoustic system. Analysis and generalization of the data showed high correlation between thermodynamic temperatures determined by the acoustic system with measurements by thermocouple for temperatures in the final period of the technological process.
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