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Proceedings Paper

Improved sampling of thermal transients using focal plane array infrared imagers
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Paper Abstract

Quantitative thermal diffusivity and thickness images can be obtained by minimizing the squared difference between the data and a thermal model. This requires the transient portion of the thermal response to be adequately sampled. For fixed infrared camera frame rates (typically 60 hertz) this may be difficult for very fast thermal transients. The focus of this work is to investigate a technique where the application of the flash heat is controlled by a variable delay. By cycling the flash heating and implementing a linearly increasing delay, thermal transients faster than the frame rate of the thermal camera can be successfully sampled. Detection of subsurface defects with improved defect contrast and spatial resolution on samples with fabricated defects is presented.

Paper Details

Date Published: 12 April 2004
PDF: 8 pages
Proc. SPIE 5405, Thermosense XXVI, (12 April 2004); doi: 10.1117/12.547453
Show Author Affiliations
Joseph N. Zalameda, Army Research Lab. (United States)
William P. Winfree, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 5405:
Thermosense XXVI
Douglas D. Burleigh; K. Elliott Cramer; G. Raymond Peacock, Editor(s)

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