The scope of this effort is to determine the viability of a new heating technique using a noncontact acoustic excitation source. Because of low coupling between air and the structure, a synchronous detection method is employed. Any reduction in the out of plane stiffness improves the acoustic coupling efficiency and as a result, defective areas have an increase in temperature relative to the surrounding area. Hence a new measurement system, based on air-coupled acoustic energy and synchronous detection is presented. An analytical model of a clamped circular plate is given, experimentally tested, and verified. Repeatability confirms the technique with a measurement uncertainty of +/- 6.2 %. The range of frequencies used was 800-2000 Hertz. Acoustic excitation and consequent thermal detection of flaws in a helicopter blade is examined and results indicate that air coupled acoustic excitation enables the detection of core damage in sandwich honeycomb structures.


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    Title :

    Air coupled acoustic thermography (ACAT) inspection technique


    Additional title:

    Luftangekoppelte akustische Thermographie-Prüftechnik (ACAT)


    Contributors:
    Zalameda, J.N. (author) / Winfree, W.P. (author) / Yost, W.T. (author)


    Publication date :

    2008


    Size :

    8 Seiten





    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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