Structural integrity assessment via coating tolerant thermography

Jon R. Lesniak; Daniel J. Bazile; Michael J. Zickel

doi:10.1117/12.259149

13 November 1996 Structural integrity assessment via coating tolerant thermography

Jon R. Lesniak, Daniel J. Bazile, Michael J. Zickel

Proceedings Volume 2946, Nondestructive Evaluation of Bridges and Highways; (1996) https://doi.org/10.1117/12.259149
Event: Nondestructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1996, Scottsdale, AZ, United States

Abstract

This paper describes a new thermal method, coating tolerant forced diffusion thermography, specifically designed to inspect large steel bridge structures. Coating tolerant thermography separates the effects of structural defects and variations in emissivity. The technique is a derivative of force 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.

Citation Download Citation

Jon R. Lesniak, Daniel J. Bazile, and Michael J. Zickel "Structural integrity assessment via coating tolerant thermography", Proc. SPIE 2946, Nondestructive Evaluation of Bridges and Highways, (13 November 1996); https://doi.org/10.1117/12.259149

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