Abstract
Inspection of a multi-layer geometry is of particular interest to the aircraft industry in which areas repaired with doublers must be continually inspected for further crack growth in the underlying structure. In some muti-layer geometries, x-ray inspection is the modality of choice due to the inaccessibility and limitations of other techniques. Because x-ray inspectability is extremely dependent upon crack opening and orientation, a need exists to quantitatively assess the detectability of cracks for various crack geometry parameters and x-ray generator parameters. X-ray simulation models for different generator types, generator settings, inspection geometries and crack parameters can be used to make these quantitative assessments [1]. The long term goal of this work is to contribute to an inspection standard for certain aircraft geometries which will account for variabilities in generator characteristics such as output spectrum, filtration, voltage and current. In this paper, we target a specific aircraft inspection problem and apply the x-ray simulation model to crack detectability in terms of contrast. In addition, some model validation is performed to support the results of the inspection simulations. Finally, a preliminary quantitative measure of crack detectability in terms of both size and contrast is derived and applied to the simulation results.
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References
J.N. Gray, F. Inane and B.E. Shull, “Three Dimensional Modeling of Projection Radiography in Review of Progress in Quantitative Nondestructive Evaluation, Vol. 8A, D.O. Thompson and D.E. Chimenti, Ed., Plenum Press, 1989.
Fundamentals of Digital Image Processing, Anil K. Jain, Prentice Hall, 1989.
R.M. Wallingford, E.M. Siwek and J.N. Gray, “Application of Two-dimensional Matched Filters to X-ray Radiographic Flaw Detection” in Review of Progress in Quantitative Nondestructive Evaluation. Vol. 11 A, D.O. Thompson and D.E. Chimenti, Ed., Plenum Press, 879–886, 1989.
R.G. Swensson and P.F. Judy, “Detection of Noisy Visual Targets: Models for the effects of spatial uncertainty and Signal-to-Noise Ratio” Perception and Psychophvsics. Vol. 29, No. 6, 521–534, 1981.
P.R. Moran, “A Physical Statistics Theory for Detectability of Target Signals in Noisy Images — Mathematical Background, Empirical Review, and Development of Theory” Medical Physics. Vol. 9, No. 3, 401–413, 1982.
M. Ishida, K. Doi, L-N. Loo, C.E. Metz, and J.L. Lehr, “Digital Image Processing: Effect on Detectability of Simulated Low-Contrast Radiographic Patterns” Radiology, Vol. 150, No. 2, 569–575, 1984.
Medical Imaging Systems, Albert Macovski, Prentice Hall, 1983.
D.T. Kuan, A.A. Sawchuk, T.C. Strand and P. Chavel, “Adaptive Noise Smoothing Filter for Images with Signal-Dependent Noise” IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 7, No. 2, 165–177, 1985.
A Handbook of Introductory Statistical Methods, C.P. Cox, Wiley, 1987.
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© 1993 Plenum Press, New York
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Wallingford, R.M., Gray, J.N. (1993). Use of an X-Ray Process Model to Determine Crack Detectability in a Multi-Layer Geometry. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2848-7_41
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DOI: https://doi.org/10.1007/978-1-4615-2848-7_41
Publisher Name: Springer, Boston, MA
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