Material defect detection with Pulse Thermography
pulsed thermography (PT) consists to briefly heat the specimen and then record the temperature decay curve. Qualitatively, the phenomenon is as follow. The temperature of the material changes rapidly after the initial thermal pulse because the thermal front propagates, by diffusion, under the surface and also because of radiation and convection losses. The presence of a defect reduces the diffusion rate so that when observing the surface temperature, defects appear as areas of different temperatures with respect to surrounding sound areas once the thermal front has reached them.
Defected material for defect detection
Result
Detail discription in the .ppt file of the folder