Long- and short-range acoustic-signal interaction with surface-breaking cracks and geometric boundaries of the rail-wheel tread area are presented in this article. Ultrasonic signals are generated using a laser-line source of varying length and distance from a crack and are detected with a 1-MHz contact transducer to map the sound field behind the crack in the near, intermediate, and far fields of the insonified region. The factors that affect the behavior of a laser-generated surface acoustic wave propagating along the tread area of a rail wheel are discussed. A signal normalization method is proposed to help in sensing the presence of a crack from the transmitted signal unaffected by the boundary effect of the complicated wheel geometry, diffraction of the acoustic wave around the crack tip, and source-to-crack length ratio and separation distance.


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    Title :

    Laser-generated acoustic signal interaction with surface flaws on rail wheels


    Additional title:

    Lasererzeugte Ultraschallwechselwirkung mit Oberflächenfehlern an Eisenbahnrädern


    Contributors:

    Published in:

    Publication date :

    2005


    Size :

    13 Seiten, 9 Bilder, 2 Tabellen, 7 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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