Abstract:
Among various widely used InfraRed Thermal NonDestructive
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
