28 January 1999 Pulse phase thermography for defect detection and visualization
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Abstract
Pulse Phase Thermography (PPT) has been reported as a novel powerful technique of the thermal NDE. It employs application of the Discrete Fourier Transform (DFT) to thermal images obtained following flash heating of the front surface of a specimen. The computed phasegrams are excellent for defect visualization in a wide range of materials. This is in part due to their low sensitivity to uneven heating. This work is an attempt to analyze advantages and limitations of PPT. Results of application of the DFT to simulated temperature decays are presented. The temperature evolution on a surface has been simulated based on an analytical solution of the 1D heat diffusion problem. A more sophisticated study has been done for different sizes of defects using numerical solution of the 3D mathematical model. Capabilities of PPT for in-depth scanning and for monitoring of the material loss are discussed. The recommendations for the practical application of the PPT are presented. Experimental results obtained following these recommendations are reported.
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Sergio Marinetti, Yuri A. Plotnikov, William P. Winfree, Alberto Braggiotti, "Pulse phase thermography for defect detection and visualization", Proc. SPIE 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, (28 January 1999); doi: 10.1117/12.339890; https://doi.org/10.1117/12.339890
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