Abstract:
The active thermal non-destructive testing and evaluation techniques
have gained wide acceptance in health monitoring of various solids
materials such as metals, composites and semiconductors. The most
popular active infrared thermographic methods for non-destructive
testing and evaluation applications are pulse based thermography and
lock-in thermography techniques. But the usage of these techniques is
limited due to their inherent limitations. To overcome the limitations of
the existing approaches, the present work demonstrates the effectiveness of digitized frequency modulated thermal wave imaging technique for detection of different shaped defects in a glass fibre reinforced
polymer specimen. Further, the usage of post-processing scheme
facilitates defect detection with high resolution and also preserves
the shape of defects.
