Comparative Analysis of Infrared Thermographic Techniques for Non-destructive Testing and Evaluation of Materials

Among the various widely used thermographic techniques, Frequency Modulated Thermal Wave Imaging (FMTWI) has proven to be indispensable for evaluating various materials. There are growing concerns of surface and sub-surface defect detection capabilities with moderate peak power heat sources compared to the widely used conventional pulse-based thermographic methods. In average testing, time compared to the sinusoidal modulated lock-in thermography make FMTWI an invaluable technique. The present work highlights a comparative study on FMTWI technique using multi-transform analysis approaches for Non-Destructive Testing and Evaluation (NDT&E) of materials.