Electromagnetic ultrasonic transducers (EMUS) do not need liquid couplants; they can be designed to operate at elevated temperatures; they can be scanned at high speeds; and they can be designed and fabricated for a much wider variety of wave modes than piezoelectric probes, especially for modes with tangential polarisation. A disadvantage is the larger insertion loss than that of piezoelectric transducers. However, using an optimised layout of probes and transmitting and receiving electronics yields sufficient power and signal/noise ratio for pipe testing and many other industrial applications. The paper describes the general state of the art and the results of optimisation for in-service inspection of gas pipelines. In particular, the optimisation of linearly polarised shear-wave transducers for vertical and oblique incidence is presented.


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    Titel :

    Electromagnetic ultrasonic transducers and systems for in-service inspection of gas pipelines


    Weitere Titelangaben:

    Elektromagnetische Ultraschallwandler und Systeme fuer die betriebliche Inspektion von Gaspipelines


    Beteiligte:
    Hoeller, P. (Autor:in) / Salzburger, H.J. (Autor:in) / Wilbrand, A. (Autor:in)


    Erscheinungsdatum :

    1987


    Format / Umfang :

    4 Seiten, 8 Bilder, 11 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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