Application of air-coupled acoustic thermography (ACAT) for inspection of honeycomb sandwich structures

Joseph N. Zalameda; William P. Winfree; Charles G. Pergantis; Daniel DeSchepper; David Flanagan

doi:10.1117/12.819493

6 May 2009 Application of air-coupled acoustic thermography (ACAT) for inspection of honeycomb sandwich structures

Joseph N. Zalameda, William P. Winfree, Charles G. Pergantis, Daniel DeSchepper, David Flanagan

Proceedings Volume 7299, Thermosense XXXI; 72990R (2009) https://doi.org/10.1117/12.819493
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

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.

Citation Download Citation

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

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