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Proceedings Paper

Application of air-coupled acoustic thermography (ACAT) for inspection of honeycomb sandwich structures
Author(s): Joseph N. Zalameda; William P. Winfree; Charles G. Pergantis; Daniel DeSchepper; David Flanagan
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Paper Abstract

The application of a noncontact air coupled acoustic heating technique is investigated for the inspection of advanced honeycomb composite structures. A weakness in the out of plane stiffness of the structure, caused by a delamination or core damage, allows for the coupling of acoustic energy and thus this area will have a higher temperature than the surrounding area. Air coupled acoustic thermography (ACAT) measurements were made on composite sandwich structures with damage and were compared to conventional flash thermography. A vibrating plate model is presented to predict the optimal acoustic source frequency. Improvements to the measurement technique are also discussed.

Paper Details

Date Published: 6 May 2009
PDF: 8 pages
Proc. SPIE 7299, Thermosense XXXI, 72990R (6 May 2009); doi: 10.1117/12.819493
Show Author Affiliations
Joseph N. Zalameda, Army Research Lab. (United States)
William P. Winfree, NASA Langley Research Ctr. (United States)
Charles G. Pergantis, Army Research Lab. (United States)
Daniel DeSchepper, Army Research Lab. (United States)
David Flanagan, Army Research Lab. (United States)


Published in SPIE Proceedings Vol. 7299:
Thermosense XXXI
Douglas D. Burleigh; Ralph B. Dinwiddie, Editor(s)

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