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Proceedings Paper

Visualization of subsurface defects in composites using a focal plane array infrared camera
Author(s): Yuri A. Plotnikov; William P. Winfree
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Paper Abstract

A technique for enhanced defect visualization in composites via transient thermography is presented in this paper. The effort targets automated defect map construction for multiple defects located in the observed area. Experimental data were collected on composite panels of different thickness with square inclusions and flat bottom holes of different depth and orientation. The time evolution of the thermal response and spatial thermal profiles are analyzed. The pattern generated by carbon fibers and the vignetting effect of the focal plane array camera make defect visualization difficult. An improvement of the defect visibility is made by the pulse phase technique and the spatial background treatment. The relationship between a size of a defect and its reconstructed image is analyzed as well. The image processing technique for noise reduction is discussed.

Paper Details

Date Published: 19 March 1999
PDF: 6 pages
Proc. SPIE 3700, Thermosense XXI, (19 March 1999); doi: 10.1117/12.342301
Show Author Affiliations
Yuri A. Plotnikov, NASA Langley Research Ctr. (United States)
William P. Winfree, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 3700:
Thermosense XXI
Dennis H. LeMieux; John R. Snell, Editor(s)

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