For selected aircraft NDE tasks, prototype SQUID systems were developed and tested in realistic environments, demonstrating the practical usability of mobile HTS SQUID in conjunction with the eddy current technique in nondestructive evaluation of highly safety relevant object. The development of planar HTS gradiometers and orientation-independent cryogenics made possible the mobile use of SQUIDs in hostile environments such as airport hangars. The sensors are mounted either in a position-independent miniature cryostat with a liquid nitrogen hold time of up to 12 hours, or on a Joule-Thomson machine-cooler only requiring electricity. Tested in the Lufthansa wheel inspection facility at Frankfurt airport and the DASA at Bremen airport, the SQUID gradiometers worked successfully under electromagnetically noisy conditions. An automated test stand for SQUID testing of aircraft wheels, with the wheel slowly rotating and a robot with the SQUID enclosure scanning stepwise along the wheel axis, detects deep cracks smaller than today's limit of conventional eddy current devices. Further development in the spatial resolution and data analysis will improve the performance. Another SQUID system has been successfully operated on a professional fuselage scanner. Using a signal processing software, first and second layer cracks were detected adjacent to rivets.


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    Titel :

    Aircraft wheel and fuselage testing with eddy current and SQUID


    Weitere Titelangaben:

    Prüfung von Flugzeugrädern und Flugzeugrumpf mit Wirbelstrom und SQUID


    Beteiligte:
    Krause, H.J. (Autor:in) / Hohmann, R. (Autor:in) / Grüneklee, M. (Autor:in) / Maus, M. (Autor:in)


    Erscheinungsdatum :

    1998


    Format / Umfang :

    8 Seiten, 11 Bilder, 14 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    Mobile HTS SQUID system for eddy current testing of aircraft

    Krause, H.J. / Hohmann, R. / Soltner, H. et al. | Tema Archiv | 1997


    Aircraft wheel testing with machine-cooled HTS SQUID gradiometer system

    Hohmann, R. / Maus, M. / Lomparski, D. et al. | Tema Archiv | 1999


    Multiplexed HTS RF SQUID magnetometer array for eddy current testing of aircraft rivet joints

    Gärtner, S. / Krause, H.J. / Wolters, N. et al. | Tema Archiv | 2002


    Aircraft fuselage section, aircraft fuselage and aircraft

    LINDE PETER / MATTHIAS HEGENBART | Europäisches Patentamt | 2023

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