The goal of this ongoing work is to optimize experimental variables for a guided wave scanning method to obtain the most revealing and accurate images of defect conditions in composite materials. This study focuses on signal processing effects involved in forming guided wave scan images. Signal processing is involved at two basic levels for deriving ultrasonic guided wave scan images. At the primary level, NASA GRC has developed algorithms to extract over 30 parameters from the multimode signal and its power spectral density. At the secondary level, there are many variables for which values must be chosen that affect actual computation of these parameters. In this study, a ceramic matrix composite sample having a delamination is characterized using the ultrasonic guided wave scan method. Energy balance and decay rate parameters of the guided wave at each scan location are calculated to form images. These images are compared with ultrasonic c-scan and thermography images. The effect of the time portion of the waveform processed on image quality is assessed by comparing with images formed using the total waveform acquired.


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    Title :

    Signal processing effects for ultrasonic guided wave scanning of composites


    Additional title:

    Signalverarbeitungseinflüsse bei der Abtastung von Verbundwerkstoff mit geführten Schallwellen


    Contributors:
    Roth, D.J. (author) / Cosgriff, L.M. (author) / Martin, R.E. (author) / Burns, E.A. (author) / Teemer, L. (author)


    Publication date :

    2005


    Size :

    7 Seiten, 3 Bilder, 3 Tabellen, 7 Quellen





    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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