This paper proposes a method to characterize the axial length of defect in pipe based on the facts that a defect's reflection results from the overlap between the reflected signals at each of its edges and the relative distance between the two edges of reflection bear a direct relationship to the axial length of defect. In this method, the front-edge signal can be obtained from a parametrical model-based estimation with the aid of EMD as signal preprocessor, which further enables the extraction of back-edge signal from the collected reflection signal. That is, our proposed method can resolve the closely spaced overlapping edge signals that are difficult to be obtained by using other conventional algorithms. Once the two edge signals have been decomposed and identified, axial length of defect can be easily and accurately derived. The experimental results have presented the proposed method can provide a good performance in evaluating axial length of defect.


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    Title :

    Parameter estimation of guided-wave reflection signal for quantitative characterization of defect in pipeline


    Additional title:

    Parameterabschätzung der Reflexion geführter Schallwellensignale zur quantitativen Charakterisierung von Fehlern in Pipelines


    Contributors:


    Publication date :

    2009


    Size :

    8 Seiten, 7 Bilder, 2 Tabellen, 5 Quellen




    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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