21 January 1985 New Development In Ndt Infrared Thermographic Techniques Help Assess Flaw Delaminations In Flight Hardware
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With the ever increasing demand of superstructures by the space and defense industries, detection of flaws, voids, and unbonded regions has acquired tremendous attention. New thermographic techniques make it now possible to quantize the extent of internal dam-age and to locate the specific layer in which the flaw exists in both honeycomb and composite structures. The usefulness of this technique was demonstrated when several aircraft wing assemblies catastrophically failed during recovery. A non-destructive (ND) test program was initiated to assess the quality of brand-new wings. The IR test revealed large unbonded areas between the wing spar and face skin in some of the wings. Results from cross section examination of these wings were in complete agreement with those of the IR scan. Emissivity correction techniques were sometimes mandatory to enhance the ability of the thermographic equipment to extract information regarding the flaws. With video recording fast documentation can be achieved, and if the system is coupled to a video processor (minicomputer), further non-real time analysis is possible (Fourier transform, image averaging, contrast stretching, image enhancement, etc.) of the area in question.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Barney, H. Decker, J. Hodor, "New Development In Ndt Infrared Thermographic Techniques Help Assess Flaw Delaminations In Flight Hardware", Proc. SPIE 0510, Infrared Technology X, (21 January 1985); doi: 10.1117/12.945024; https://doi.org/10.1117/12.945024


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