6 May 2009 Application of air-coupled acoustic thermography (ACAT) for inspection of honeycomb sandwich structures
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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.
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Joseph N. Zalameda, William P. Winfree, Charles G. Pergantis, Daniel DeSchepper, David Flanagan, "Application of air-coupled acoustic thermography (ACAT) for inspection of honeycomb sandwich structures", Proc. SPIE 7299, Thermosense XXXI, 72990R (6 May 2009); doi: 10.1117/12.819493; https://doi.org/10.1117/12.819493
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