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The paper deals with the visualization of thermal fi elds above the sample body while observing thermal loading of wood. Via holographic interferometry, thermal fi elds were visualized in a non-contact manner and the values were recorded in 0, 3, 7 and 15 minutes or earlier in case of degradation. In real time, the ongoing processes were recorded in the thermal boundary layer above the surface of sample bodies in dimensions of 43 mm × 40 mm × 10 mm of beech wood in three different directions: longitudinal, radial, tangential cut. The temperatures of isothermal curves above the heated samples and coeffi cients of heat transfer α were determined by a quantitative analysis of holographic interferograms. The heat transfer coeffi cient α ranged within 4.6-7.4 W/m2K. The simulation of heat transfer for the selected samples was prepared by the Fluent programme. Consequently, the measured values from the experiments were compared with the calculated values. There is a correlation between the measured and calculated values.

Investigation of temperature fields in the air environment above wood subjected to thermal degradation