Abstract
The present paper describes the development and first application of ultrasonic imaging of timber (wood) by means of reconstruction calculation (3D-SAFT; Synthetic Aperture Focusing Technique). It considers the highly anisotropic ultrasonic velocity on wood. In order to validate such techniques we report on experiments carried out on test specimens made from pine and beech. Those specimens differ for the orientations of the annual rings. For the reconstruction calculation the slowness curves of the material are considered applying the elastic constants known from the literature. The anisotropic SAFT reconstruction is calculated from measured datasets and from synthetic data resulting from EFIT modelling (EFIT: Elastodynamic Finite Integration Technique).
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References
Hasenstab, A., Hillemeier, B., Krause, M. [2005]: Defect Localization in Wood with Low Frequency Ultrasonic Echo Technique. In: Proceedings of the 14th International Symposium on NDT of Wood, 02.-04.05.05, Hannover.
Mayer, K., Marklein, R., Langenberg, K.J., Kreutter, T. [1990]: Three-dimensional imaging system based on Fourier transform synthetic aperture focusing technique. Ultrasonics V 28, pp. 241–255.
Marklein, R. [1997]: Numerische Verfahren zur Modellierung von akustischen, elektromagnetischen, elastischen und piezoelektrischen Wellenausbreitungsproblem im Zeitbereich basierend auf der Finiten Integrationstechnik. Shaker Verlag, Aachen, Germany.
Chinta, P., Mayer, K., Krause M. [2010]: Ultraschallmodellierung und SAFT-Rekonstruktion von Fehlstellen in Holzbauteilen. In: Berichtsband der DGZfP-Jahrestagung 2010, Erfurt, 10.-12. Mai 2010, BB 122-CD, Poster 59, 8 pages.
Musgrave, M.J.P. [1970]: Crystal Acoustics, Introduction to the study of elastic waves and vibrations in crystals. Holden-Day, San Fancisco, USA.
Bucur, V. [2006]: Acoustics of Wood. 2nd Edition, Springer-Verlag, Berlin Heidelberg, Germany.
Schubert, S. [2007]: Acousto-Ultrasound Assessment of Inner Wood-Decay in Standing Trees: Possibilities and Limitations. Swiss Federal Institute of Technology, Zurich, Dissertation ETH Nr. 17126, 125 pages.
Bucur, V., Lanceleur, P., Roge, B. [2002]: Acoustic properties of wood in tridimensional representation of slowness surfaces. Ultrasonics 40, pp. 537–541.
Acknowledgements
This research work is funded by the Federal Office for Building and Regional Planning (BBR, Germany).
The authors would like to acknowledge Prof. Karl-Jörg Langenberg and Priv.-Doz. Dr.-Ing. Rene Marklein for their support. The test specimens were made by Mr. M. Lange (BAM VIII.2) and Mr. D. Rätsch BAM IV.1).
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Krause, M., Chinta, P.K., Mayer, K., Effner, U.A., Müller, S. (2013). NDT of Structural Timber Members by Means of 3D Ultrasonic Imaging Techniques and Modelling. In: Güneş, O., Akkaya, Y. (eds) Nondestructive Testing of Materials and Structures. RILEM Bookseries, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0723-8_4
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DOI: https://doi.org/10.1007/978-94-007-0723-8_4
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