We provide a simple solution for the particular problem of the in-service inspection of aeronautic surfaces in order to detect bumps that is otherwise done visually and usually less reliably. Bumps and other surface defects can be a symptom of more serious internal damage. We have extended the use of the well know shadow Moire technique to be implemented on convex curved surfaces. The use of a flexible Ronchi grating allows its adaptation to a convex general surface. The effect is the contrast enhancement of only the small defects sweeping-off other misleading height profile fringes. The results obtained are quite satisfactory compared to the use of flat reference gratings. The experimental setup consists of a plastic foil with a printed Ronchi grating stretched between three points which adapts to any cylindrical or conical convex surface independently of the relative grating-surface orientation. Static quantification of profiles of defects is also possible by means of with an attached CCD camera. Visual detectability of local surface structures lie in the range of approximately 30 mu m in depth.


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    Titel :

    Detection of microbumps in aeronautic surfaces by means of an elastical Moire system


    Beteiligte:


    Erscheinungsdatum :

    2001


    Format / Umfang :

    8 Seiten, 15 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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