Defects like delamination and debonding produce a small but significant stiffness change at the surface of the test object. This effect can be used by the shearography-testing-method for the full range of aeronautic inspection demands. One attempt to deal with bad optical surface conditions is to improve the laser light distribution by two compact laser sources. Successful loading the test object to achieve reliable inspection results needs further attention. Especially thermal loading - the easiest way especially in case of aircraft maintenance inspection: improvements are necessary to develop a portable system to introduce heat in a controlled, but fast way to the test object. Making shearography testing highly mobile is a further necessary attempt to rise the acceptance level in the maintenance world: A portable shearography set for heat loading is still innovative. Traditional CCD cameras have a limit in dynamic range. This is a problem with the Gaussian shaped illumination from the laser. Using a CMOS camera with possibilities to program the dynamic range for each pixel independent of each other is a totally new concept which will increase the usefulness dramatically since it will result in easier illumination. First attemps with common CMOS-sensors have shown that the loss of quality due to the lower dynamic range against the CCD-sensor is significant when preventing overmudulation. The presentation will describe the developments within the EC-funded project INCA with the following examples: The development of a mobile shearography-system for aircraft in-service inspection. Integration of a CMOS-sensor. Results of examinations on real aircraft structures.


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    Title :

    Improvement of the applicability of shearography under aircraft production and maintenance conditions


    Additional title:

    Verbesserung der Anwendbarkeit der Scherographie unter Luftfahrtproduktions- und Wartungsbedingungen


    Contributors:
    Manzke, H. (author) / Kalms, M. (author) / Rau, E. (author) / Grauvogl, E. (author)


    Publication date :

    2004


    Size :

    7 Seiten, 11 Bilder, 2 Quellen


    Remarks:

    (Nicht paginiert)


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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