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Proceedings Paper

Improved flaw detection and characterization with difference thermography
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Paper Abstract

Flaw detection and characterization with thermographic techniques in graphite polymer composites is often limited by localized variations in the thermographic response. Variations in properties such as acceptable porosity, variations in fiber volume content and surface polymer thickness result in variations in the thermal response that in general cause significant variations in the initial thermal response. These variations result in a noise floor that increases the difficulty of detecting and characterizing deeper flaws. The paper investigates comparing thermographic responses taken before and after a change in state in a composite to improve the detection of subsurface flaws. A method is presented for registration of the responses before finding the difference. A significant improvement in the detectability is achieved by comparing the differences in response. Examples of changes in state due to application of a load and impact are presented.

Paper Details

Date Published: 10 May 2011
PDF: 9 pages
Proc. SPIE 8013, Thermosense: Thermal Infrared Applications XXXIII, 80130U (10 May 2011); doi: 10.1117/12.883472
Show Author Affiliations
William P. Winfree, NASA Langley Research Ctr. (United States)
Joseph N. Zalameda, NASA Langley Research Ctr. (United States)
Patricia A. Howell, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 8013:
Thermosense: Thermal Infrared Applications XXXIII
Morteza Safai; Jeff R. Brown, Editor(s)

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