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Proceedings Paper

Reference-free analysis of flash thermography data
Author(s): Steven M. Shepard; Yulin Hou; Tasdiq Ahmed; James R. Lhota
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Paper Abstract

Since its introduction 5 years ago, the Thermographic Signal Reconstruction (TSR) method has become a widely accepted approach to processing and interpreting active thermography data. Although the technique generates a noise free replica of an experimental data sequence, it is the time derivatives of the replica that have proved to be most useful. In particular, the second derivative of the TSR signal offers increased sensitivity, noise and artifact suppression and reference-free evaluation and quantification of results. Unlike contrast methods, where a point is evaluated by comparison to a defect-free reference, the TSR second derivative of a single pixel indicates the presence of a subsurface defect, or in the absence of a defect, it can be used to measure the local thermal diffusivity.

Paper Details

Date Published: 18 April 2006
PDF: 7 pages
Proc. SPIE 6205, Thermosense XXVIII, 620513 (18 April 2006); doi: 10.1117/12.669396
Show Author Affiliations
Steven M. Shepard, Thermal Wave Imaging, Inc. (United States)
Yulin Hou, Thermal Wave Imaging, Inc. (United States)
Tasdiq Ahmed, Thermal Wave Imaging, Inc. (United States)
James R. Lhota, Thermal Wave Imaging, Inc. (United States)

Published in SPIE Proceedings Vol. 6205:
Thermosense XXVIII
Jonathan J. Miles; G. Raymond Peacock; Kathryn M. Knettel, Editor(s)

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