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Improvement of the detection of defects by pulse thermography thanks to the TSR approach in the case of a smart composite repair patch

The work aims to assess quantitatively the improvement given by using the Thermographic Signal Reconstruction (TSR) approach to the detectivity of defects in structures. The considered structure is a smart composite repair patch used in aeronautics. Artificial defects simulating a debond at the patch/structure interface are to be detected. The signal to noise ratio of the defect in the sound structure background is calculated as an index of detectivity. A strategy is proposed for optimizing the time of observation allowing the best detection and characterization.