Abstract
Among various widely used InfraRed Thermal Non-Destructive Testing (IRTNDT) modalities, Non-Stationary Thermal Wave Imaging (NSTWI) techniques have proved to be an indispensable approach for the inspection and evaluation of various materials. Growing concern for the development of surface and subsurface defect detection techniques with moderate peak power heat sources (than the widely used conventional pulse based thermographic methods) and in a reasonably less testing time (compared to sinusoidal modulated lock-in thermography), makes these NSTWI techniques invaluable for this field. The present work highlights a comparative study on various NSTWI techniques, further experimental results are presented to find their defect detection capabilities by taking signal to noise ratio (SNR) into consideration.
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