In the paper, the possibility of detection the hidden defects or damage applying the models of dynamic (active) infrared thermography and the 2D discrete wavelet transform of data measured in thermal processes has been described. The possibility to examine the defects of the material structure with the discrete wavelet transform (DWT) of the spatial function registering the disturbance underwent analysis. Besides of theoretical information abaut application of these transforms, the results of MES digital simulations as well as qualitative experimental have been presented. The performed digital simulations proved that the 2D discrete wavelet transform could be effective tool for non-destructive identification of the structural defects. High level of the noise compared to the disturbances generated by the structural defect causes some limitations of this method
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