Ground-based radar interferometry has recently emerged as an innovative technology of remote sensing, able to accurately measure the static or dynamic displacement of several points of a structure. This technique in the last couple of years has been applied to different types of structures, such as bridges, towers and chimneys. This paper presents a prototype system developed by IDS, originally aimed at measuring the structural vibrations of helicopter rotor blades, based on an interferometric technique and constituted by combination of a radar sensor and a series of transponders installed on the target structure. The main advantages of this solution with respect to conventional interferometric radars, are related to the increased spatial resolution of the system, provided by the possibility to discriminate different transponders installed within the same resolution cell of the radar sensor, and to the reduction of the ambient noise (e.g. multi-path) on the radar measurement. The first feature allows the use of the microwave technology even on target areas with limited dimensions, such as industrial facilities, while the second aspect may extend the use of radar interferometric systems to complex scenarios, where multi-reflections are expected due to the presence of natural targets with high reflectivity to the radar signal. In the paper, the system and its major characteristics are first described; subsequently, application to the measurement of ambient vibration response of a lab set-up is summarized. Then the data acquired on a rotating mock-up are reported and analyzed to identify natural frequencies and mode shapes of the investigated structure.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    An innovative transponder-based interferometric radar for vibration measurements


    Contributors:
    Coppi, F. (author) / Cerutti, A. (author) / Farina, P. (author) / Pasquale, G. de (author) / Novembrini, G. (author)


    Publication date :

    2010


    Size :

    7 Seiten, 7 Bilder, 2 Tabellen, 9 Quellen





    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The marine radar interrogator-transponder

    Isbister, E.J. | Tema Archive | 1977


    Solid-state UHF radar transponder

    Cartledge, L. / Tiffany, G.B. | Engineering Index Backfile | 1960


    A light secondary radar transponder

    Hindson, W.D. / Barnes, D.C. / Cross, F.R. | Tema Archive | 1973


    A Light Aircraft Secondary Radar Transponder

    W. D. Hindson / D. C. Barnes / F. R. Cross et al. | NTIS | 1973