Termography based on optical techniques, in general, provide very good defect resolution. However, results are strongly affected by surface features and external factors such as non uniform heating and environmental reflections. Advanced signal/image processing is required to reduce their impact. For instance, PPT and TSR techniques allow detecting defects down to a depth of 2.5 mm, for defects having a size-to-depth ratio of approximately 2 and higher. Thermography using ultrasounds provide an interesting means for inspecting materials. It has the inconvenience of requiring a physical contact between the ultrasonic transducer and the specimen and that many experimental factors need to be addressed to obtain good results. Nevertheless, once all these factors are correctly addressed, inspection is extremely fast and results provide good defect contrast without processing. Cold image subtraction or the FFT can be used to improve contrast in some cases. Electromagnetic excitation is a relatively new field of investigation in active thermography. In this study only line inspection was used. Pulsed and modulated inductive excitations are currently under investigation.


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    Titel :

    Infrared thermography. Principle and applications to aircraft materials


    Weitere Titelangaben:

    Infrarotthermographie. Prinzipien und Anwendungen auf Luftfahrtwerkstoffe


    Beteiligte:


    Erscheinungsdatum :

    2008


    Format / Umfang :

    8 Seiten, 2 Bilder, 1 Tabelle, 21 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Infrared Thermography: Principle and Applications to Aircraft Materials

    Maldague, X. / Larbi, W. Ben / Bendada, A. et al. | TIBKAT | 2008


    Infrared thermography: principles and applications

    Speakman, J. R. / Ward, S. | British Library Conference Proceedings | 1998




    Theory and applications of infrared thermography

    Clark, M.R. / McCann, D.M. / Forde, M.C. | Tema Archiv | 2001