Signal Reconstruction and Feature Extraction of Pulsed Eddy Current Thermography for Aerospace Composites
نویسندگان
چکیده
Pulsed eddy current (PEC) stimulated thermography is proposed as a powerful non-destructive evaluation (NDE) technique, allowing the operator to observe the heating developed from the eddy current distribution in a structure using infrared imaging, detecting defects over a relatively wide area within a short time. Some defects (impact, delamination, disbond or crack) commonly occur in aerospace composite components, such as carbon fibre reinforced plastic (CFRP), which can lead to safety issues. For the defects on the surface and near-surface, early detection has been proposed previously. For the sub-surface or deep hidden defects like delamination, the raw data is invalid because of the severe lateral heat diffusion. Tucker decomposition is proposed combining PEC stimulated thermography to detect and evaluate the defects in composites. In the proposed signal reconstruction (SR) approach, several hundred frames of raw data (3D tensor) representing the time history are processed.
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