SUMMARY
The paper shows experimental results of fatigue crack detection, performed by laser spot thermography and vibrothermography techniques. The experiments were conducted on aluminium bar with artificially introduced crack. The paper contains theoretical background of both techniques. Also test setups including the control and signal processing software were presented and described. Semi-automatic algorithm for data processing was presented. The algorithm allows for automating measurement procedure, which limits the operator input. The paper shows that both laser spot thermography, as well as, vibrothermography can be effectively used for crack detection in metallic structures