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Proceedings Paper

Thermal diffusivity imaging with a moving line source
Author(s): William P. Winfree; D. Michele Heath; K. Elliott Cramer
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Paper Abstract

The thermal line scan technique has been shown to be an effective technique for rapid inspection of aerospace specimens. Past efforts have focused on thermal measurements far behind the line source where the heat flow normal to the surface is negligible. This paper focuses on measurements closer to the line source to enable the measurement of the thermal diffusivity in the surface normal direction. This measurement also enables an independent characterization of the thermal diffusivity in the direction of motion of the thermal line source. An analytical solution is given for a line source moving with constant velocity across an anisotropic plane. A nonlinear least squares fitting routine is used to reduce the temporal response of a specimen to images of the thermal diffusivity in both the directions normal to the surface and parallel to the motion of the line source. Measurements are presented on specimens with known variations in effective diffusivity. Measurements on these specimens allow a comparison of this technique to more conventional techniques for diffusivity measurement.

Paper Details

Date Published: 23 March 2001
PDF: 10 pages
Proc. SPIE 4360, Thermosense XXIII, (23 March 2001); doi: 10.1117/12.421035
Show Author Affiliations
William P. Winfree, NASA Langley Research Ctr. (United States)
D. Michele Heath, NASA Langley Research Ctr. (United States)
K. Elliott Cramer, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 4360:
Thermosense XXIII
Andres E. Rozlosnik; Ralph B. Dinwiddie, Editor(s)

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