4 April 1997 Coating tolerant thermography for the detection of cracks in structures
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A new variation of forced-diffusion thermography, coating tolerant forced diffusion thermography, is described. This new thermal method is specifically designed to inspect large steel bridge structures. To increase effectiveness in the field coating tolerant thermography separates the effects of structural defects from variations in emissivity. The technique is a derivative of forced diffusion thermography which uses patterned radiation to force heat flow in-plane to specifically target cracks. This paper presents the fundamentals of coating tolerant forced diffusion thermography including the mathematical bases for the separation of thermal gradients and emissivity gradients. Also, presented are case studies including the inspection of a bridge girder samples at FHWA Turner Fairbanks Lab.
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Jon R. Lesniak, Jon R. Lesniak, Daniel J. Bazile, Daniel J. Bazile, Michael J. Zickel, Michael J. Zickel, } "Coating tolerant thermography for the detection of cracks in structures", Proc. SPIE 3056, Thermosense XIX: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (4 April 1997); doi: 10.1117/12.271648; https://doi.org/10.1117/12.271648

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