Non-destructive thermal-wave-radar imaging of manufactured green powder metallurgy compact flaws (cracks)

Comparison between Thermal-wave-radar (TWR) original phase images (top) and Automatic Defect Recognition (ADR) processed images (bottom) of two green samples: (a) with cracks; and (b) without cracks. The regions with cracks, local defects and intact material are indicated with green, red and purple color, respectively, in the ADR processed images.176