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Proceedings Paper

Comparison of pulse phase and thermographic signal reconstruction processing methods
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Paper Abstract

Active thermography data for nondestructive testing has traditionally been evaluated by either visual or numerical identification of anomalous surface temperature contrast in the IR image sequence obtained as the target sample cools in response to thermal stimulation. However, in recent years, it has been demonstrated that considerably more information about the subsurface condition of a sample can be obtained by evaluating the time history of each pixel independently. In this paper, we evaluate the capabilities of two such analysis techniques, Pulse Phase Thermography (PPT) and Thermographic Signal Reconstruction (TSR) using induction and optical flash excitation. Data sequences from optical pulse and scanned induction heating are analyzed with both methods. Results are evaluated in terms of signal-tobackground ratio for a given subsurface feature. In addition to the experimental data, we present finite element simulation models with varying flaw diameter and depth, and discuss size measurement accuracy and the effect of noise on detection limits and sensitivity for both methods.

Paper Details

Date Published: 22 May 2013
PDF: 9 pages
Proc. SPIE 8705, Thermosense: Thermal Infrared Applications XXXV, 87050S (22 May 2013); doi: 10.1117/12.2017899
Show Author Affiliations
Beata Oswald-Tranta, Univ. of Leoben (Austria)
Steven M. Shepard, Thermal Wave Imaging, Inc. (United States)

Published in SPIE Proceedings Vol. 8705:
Thermosense: Thermal Infrared Applications XXXV
Gregory R. Stockton; Fred P. Colbert, Editor(s)

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