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