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Application of Air Coupled Acoustic Thermography (ACAT) for Inspection of Honeycomb Sandwich StructuresThe 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.
Document ID
20090019139
Document Type
Conference Paper
Authors
Winfree, William P.
(NASA Langley Research Center Hampton, VA, United States)
Zalameda, Joseph N.
(Army Research Lab. United States)
Pergantis, Charles
(Army Research Lab. United States)
Flanagan, David
(Army Research Lab. United States)
Deschepper, Daniel
(Army Research Lab. United States)
Date Acquired
August 24, 2013
Publication Date
April 13, 2009
Subject Category
Acoustics
Report/Patent Number
LF99-7784
Meeting Information
SPIE Defense, Security, and Sensing 2009(Florida)
Distribution Limits
Public
Copyright
Public Use Permitted.

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