From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
By using relationships between wave propagation and thermal diffusive propagation, it was shown that that one can transform from diffusive propagation into an equivalent wave field. The transformation results in sharp reflections with time delay proportional to the distance. The performance of the transform was tested on carbon composite samples using either xenon flash or incandescent quartz halogen light bulb excitations. The images are as good as any of the common techniques in use. The method can detect artificial damage locate at the depth of the 12th carbon mats. Application of back projection was also demonstrated. The combined use of the equivalent wave field transform and back projection improves both depth and lateral resolution. The technique is very efficient in term of computational load.
M. Gershenson, "Equivalent wave field transform applied to pulse thermography in carbon composite samples," Proc. SPIE 10661, Thermosense: Thermal Infrared Applications XL, 106610R (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 18, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2302712.
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