The comparing of models for indirect measurement of temperatures in steel coils

The heating of material belongs to group of technological processes with high energetically consumption. The measurement temperature in inside body of material is not possible directly from variously reasons. In more cases the temperature is measured by thermocouple on surface of material or the temperature of combustion products are measured. Of course these ways do not provide required quality of heating. In opposite case, the consumption of fuel is higher. In paper is described the method of indirect measuring, which is based on solving of Fourier´s partial differential equation. This equation is solved for boundary condition of first kind. The analytical and numerical solving was applied. Both methods were verified by experiment. The deviation between direct and indirect measurement has been 3 - 3.5 %.