Characterization of active thermographic system performance

Steven M. Shepard; Tasdiq Ahmed

doi:10.1117/12.342306

19 March 1999 Characterization of active thermographic system performance

Steven M. Shepard, Tasdiq Ahmed

Proceedings Volume 3700, Thermosense XXI; (1999) https://doi.org/10.1117/12.342306
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

The decision to use Thermographic Nondestructive Testing (TNDT) for a particular application is frequently made on an empirical basis using flat bottom hole test samples. In many cases, results are interpreted using subjective, non- quantitative criteria that cannot be generalized to apply to a broader range of applications. Although sensitivity is generally considered an important indicator of TNDT system performance, subsurface spatial resolution is rarely discussed. We present a methodology for TNDT system performance characterization that is loosely modeled on the Modulation Transfer Function (MTF) used in visual imaging. Once a TNDT system has been characterized using this approach, system performance for other applications can be accurately predicted. Examples including a steel resolution target and flat bottom holes in a CMC panel are discussed.

Citation Download Citation

Steven M. Shepard and Tasdiq Ahmed "Characterization of active thermographic system performance", Proc. SPIE 3700, Thermosense XXI, (19 March 1999); https://doi.org/10.1117/12.342306

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