Comparison of pulse phase and thermographic signal reconstruction processing methods

Beata Oswald-Tranta; Steven M. Shepard

doi:10.1117/12.2017899

22 May 2013 Comparison of pulse phase and thermographic signal reconstruction processing methods

Proceedings Volume 8705, Thermosense: Thermal Infrared Applications XXXV; 87050S (2013) https://doi.org/10.1117/12.2017899
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

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.

Citation Download Citation

Beata Oswald-Tranta and Steven M. Shepard "Comparison of pulse phase and thermographic signal reconstruction processing methods", Proc. SPIE 8705, Thermosense: Thermal Infrared Applications XXXV, 87050S (22 May 2013); https://doi.org/10.1117/12.2017899

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