Estimation of inaccuracies of thermocouple measurements of the temperature profile in pyrolyzed solid substances

Thermal interaction of a thermocouple embedded into a solid substance pyrolyzed by an external heat source with the thermal wave propagating inward the substance from the pyrolysis surface is considered. Numerical simulations show that a heat sink through thermocouple wires inward the substance occurs because of a significant difference in thermal conductivities of the solid substance and thermocouple material, which leads to substantial changes in thermojunction, thus, distorting thermocouple data.