Abstract
The detection of defects in materials and components using ultrasonic nondestructive testing and evaluation techniques is of interest in many industrial areas. Reliable defect detection requires defined and reproducible scanning of the probes along the surface of the components. For post-processing of the recorded rf-data the Synthetic Aperture Focusing Technique SAFT has been successfully applied to improve the performance of ultrasonic testing. For specific defect and component configurations, the Time-of-Flight Diffraction technique TOFD has also been successfully applied for quantitative evaluation of crack sizes. This contribution reviews developments and applications of SAFT and TOFD with reference to representative examples from the past and the present.
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References
Prine, D.W.: Synthetic aperture ultrasonic imaging. In: Proc. of the Eng. Appl. of Holography Symposium, p. 287. SPIE Press, Bellingham (1972)
Silk, M.G.: Sizing crack-like defects by ultrasonic means. In: Sharpe, R.S. (ed.) Research Techniques in Non-Destructive Testing, vol. 3. Academic Press, London (1977)
Spies, M., Rieder, H.: Synthetic aperture focusing of ultrasonic inspection data to enhance the probability of detection of defects in strongly attenuating materials. NDT E Int. 43, 425–431 (2010)
Frederick, J.R., Seydel, J.A., Fairchild, R.C.: Improved ultrasonic nondestructive testing of pressure vessels. U.S. Nuclear Regulatory Commission Report NUREG-0007-1 (1976)
Seydel, J.A.: Ultrasonic synthetic aperture focusing techniques in NDT. In: Sharpe, R.S. (ed.) Research Techniques in Nondestructive Testing, vol. 6, pp. 1–47. Academic Press, London (1982)
Johnson, J.: Parameter study of synthetic aperture focusing in ultrasonics. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE, vol. 1, pp. 735–752. Plenum Press, New York (1982)
Thomson, R.N.: Transverse and longitudinal resolution of the synthetic aperture focusing technique. Ultrasonics 22, 9–15 (1984)
Burch, S.F., Burton, J.T.: Ultrasonic synthetic aperture focusing using planar pulse-echo transducers. Ultrasonics 22, 275–281 (1984)
Doctor, S.R., Hall, T.E., Reid, L.D.: SAFT—the evolution of a signal processing technology for ultrasonic testing. NDT Int. 19, 163–167 (1986)
Kramer, S.: Ultrasonic weld defect sizing using the synthetic aperture focusing technique. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE, vol. 8, pp. 1995–2002. Plenum Press, New York (1989)
Hughes, M.S., Hsu, D.K., Margetan, F., Thompson, R.B., et al.: Application of SAFT on composites. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE, vol. 11, pp. 1413–1419. Plenum Press, New York (1992)
Langenberg, K.J., Brandfaß, M., Klaholz, S., et al.: Applied inversion in nondestructive testing. In: Louis, A.K., Engl, H.W., Rundell, W. (eds.) Inverse Problems in Medical Imaging and Nondestructive Testing. Springer, Berlin (1996)
Kline, R.A.: SAFT imaging in anisotropic media. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE, vol. 18, pp. 913–919. Plenum Press, New York (1999)
Spies, M., Jager, W.: Synthetic aperture focusing for defect reconstruction in anisotropic media. Ultrasonics 41, 125–131 (2003)
Scheben, R., Götz, S., Spies, M., Rieder, H.: Improved quality assurance via the interaction of inspection procedures with simulation and reconstruction algorithms. In: Proceedings of the DACH Meeting 2008, vol. 113-CD. DGZfP, Berlin (2008). Mi.4.B.1 (in German)
Engstrand, C., Kline, R.: Application of SAFT to layered, anisotropic media. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE. AIP Conference Proceedings CP760, pp. 1151–1158. American Institute of Physics, Melville (2004)
Shlivinski, A., Langenberg, K.J.: Defect imaging with elastic waves in inhomogeneous-anisotropic materials with composite geometries. Ultrasonics 46, 89–104 (2007)
Doctor, S.R., Schuster, G.J., Reid, L.D., Hall, T.E.: Real-time 3D SAFT UT system evaluation and validation. Pacific Northwest National Laboratory, USA, Report NUREG/CR-6344 PNNL-10571 (1996)
Rieder, H., Dillhöfer, A., Spies, M.: MMC-USIS—development of a compact LAN-based inspection system for automated ultrasonic testing, SAFT-evaluation and 3D visualization. In: Proceedings of the DGZfP Annual Meeting 2010, vol. 122-CD, p. 46. DGZfP, Berlin (2010) (in German)
Mayer, K., Marklein, R., Langenberg, K.J., Kreutter, T.: Three-dimensional imaging system based on Fourier-transform synthetic aperture focusing technique. Ultrasonics 28, 241–255 (1990)
Busse, L.J.: Three-dimensional imaging using a frequency-domain synthetic aperture focusing technique. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 39, 174–179 (1992)
Lévesque, D., Blouin, A., Néron, C., Monchalin, J.P.: Performance of laser-ultrasonic F-SAFT imaging. Ultrasonics 40, 1057–1063 (2002)
Stepinski, T.: An implementation of synthetic aperture focusing technique in frequency domain. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 54, 1399–1408 (2007)
Yamani, A.: Three-dimensional imaging using a new synthetic aperture focusing technique. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 44, 943–947 (1997)
Li, M.L., Guan, W.J., Li, P.C.: Improved synthetic aperture focusing technique with applications in high-frequency ultrasound imaging. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 51, 63–70 (2004)
Schuster, G.J., Doctor, S.R., Bond, L.J.: A system for high-resolution, nondestructive, ultrasonic imaging of weld grains. IEEE Trans. Instrum. Meas. 53, 1526–1532 (2004)
Ruiter, N.V., Schwarzenberg, G.F., Zapf, M., Gemmeke, H.: Improvement of 3D ultrasound computer tomography images by signal pre-processing. In: Ultrasonics Symposium, 2008, IUS 2008, Beijing, China, pp. 852–855. IEEE Press, New York (2008)
Lingwall, F., Stepinski, T.: Compensating transducer diffraction effects in synthetic aperture imaging for immersed solids. In: Ultrasonics Symposium, 2002, pp. 719–722. IEEE Press, New York (2002)
Wennerström, E., Stepinski, T.: An iterative synthetic aperture imaging algorithm with correction of diffraction effects. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 53, 1008–1017 (2006)
Lorenz, M., Wielinga, T.S.: Ultrasonic characterization of defects in steel using multi-SAFT imaging and neural networks. NDT E 26, 127–133 (1993)
Krause, M., Mielentz, F., Milmann, B., Streicher, D., Müller, W.: Ultrasonic imaging of concrete elements: state of the art using 2D synthetic aperture. In: International Symposium (NDT-CE 2003) on Non-Destructive Testing in Civil Engineering (2003). http://ndt.net/article/ndtce03/papers/v051/v051.htm
Schickert, M., Krause, M., Müller, W.: Ultrasonic imaging of concrete elements using reconstruction by synthetic aperture focusing technique. J. Mater. Civ. Eng. 15, 235–246 (2003)
Krause, M., Milmann, B., Mielentz, F., Streicher, D., et al.: Ultrasonic imaging methods for investigation of post-tensioned concrete structures: a study of interfaces at artificial grouting faults and its verification. J. Nondestruct. Eval. 27, 67–82 (2008)
Junglewitz, A., Spies, M., Rieder, H.: Operational challenges: extension of propeller welding repairs for a higher availability of ships. In: Proceedings of The Riviera Annual Marine Propulsion Conference 2008, London (2008). http://rivieramm.com
Spies, M., Rieder, H., Dillhöfer, A.: On-site evaluation of large components using SAFT and TOFD ultrasonic imaging. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE. AIP Conference Proceedings CP1335, pp. 1394–1401. American Institute of Physics, Melville (2011)
Silk, M.G.: The use of diffraction-based time-of-flight measurements to locate and size defects. Br. J. NDT 26, 208–213 (1984)
British Standard BS7706: Guide to calibration and setting-up of the ultrasonic TOFD technique. British Standards Institution (1993)
Charlesworth, J.P., Temple, J.A.G.: Engineering applications of ultrasonic time-of-flight diffraction. Research Studies Press Ltd., Great Britain (2001)
Farley, J.M., Goujon, N.S., Shepherd, B.W.O.: Critical evaluation of TOFD for search scanning. In: Proceedings of the 16th World Conference on NDT, Montreal, Canada (2004). http://ndt.net
AEA Technology Energy: In: Celebrating TOFD’s 25th Anniversary, vol. 4, 6 (1999). http://ndt.net
Martinez-Ona, R., Viggianello, S., Bleuze, A.: On the qualification of TOFD technique for austenitic stainless steel welds inspection. In: Proceedings of the 9th ECNDT, Berlin, Germany, DGZfP-Proceedings 103-CD (2006)
Lin, S., Fukutomi, H., Ogata, T.: Analysis of wave propagation for the TOFD method by finite element method: optimization of test configuration and proposal of a new TOFD method. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE. AIP Conference Proceedings CP820, pp. 1103–1110. American Institute of Physics, Melville (2005)
de Geus, S.J., Dijkstra, F.H., Bouma, T.: Advances in TOFD inspection. In: Proceedings of the 15th World Conference on NDT, Rome, Italy (2000). http://ndt.net
Chen, Y.: The application of TOFD technique on the large pressure vessel. In: Proceedings of the 17th World Conference on NDT, Shanghai, China (2008). http://ndt.net
Baskaran, G., Balasubramaniam, K., Rao, C.L.: Shear-wave time of flight diffraction (S-TOFD) technique. NDT E Int. 39, 458–467 (2006)
Moura, E., Silva, R., Siqueira, M., Rebello, J.: Pattern recognition of weld defects on pre-processed TOFD signals using linear classifiers. J. Nondestruct. Eval. 23, 163–171 (2004)
da Silva, I.C., Siqueira, M.H.S.: Automatic inspection using the TOFD technique and neural networks. In: Proceedings of the 8th European Conference in Non Destructive Testing, ECNDT, Barcelona (2002). http://ndt.net
Shekhar, C., Shitole, N.: Combining fuzzy logic and neural networks in classification of weld defects using ultrasonic time of flight diffraction. In: 45th Annual British Conference on NDT, NDT 2006, Stratford-upon-Avon, UK (2006)
Meksen, T.M., Boudraa, B., Drai, R., Boudraa, M.: Automatic crack detection and characterization during ultrasonic inspection. J. Nondestruct. Eval. 29, 169–174 (2010)
Kechida, A., Drai, R., Guessoum, A.: Texture analysis for flaw detection in ultrasonic images. J. Nondestruct. Eval. (2011). Published online 7 Dec. 2011
Krautkrämer, J., Krautkrämer, H.: Ultrasonic Testing of Materials. Springer, Berlin (1990)
Spies, M.: Semi-analytical elastic wave-field modeling applied to arbitrarily oriented orthotropic media. J. Acoust. Soc. Am. 110, 68–79 (2001)
Mondal, S., Sattar, T.: An overview TOFD method and its mathematical model (2000). http://www.ndt.net/article/v05n04/mondal/mondal.htm
Schmitz, V.: Nondestructive acoustic imaging techniques. In: Fink, M., et al. (eds.) Imaging of Complex Media with Acoustic and Seismic Waves. Topics Appl. Phys., vol. 84, pp. 167–190. Springer, Berlin (2002)
Doctor, S.R.: Nuclear power plant NDE challenges—past, present and future. In: Thompson, D.O., Chimenti, D.E. (eds.) Review of Progress in QNDE. AIP Conference Proceedings CP894, pp. 17–31. American Institute of Physics, Melville (2007)
Office of Inspection and Enforcement: Stress corrosion cracking in large-diameter stainless steel recirculation system piping at BWR plants, IE Bulletin No. 83-02, US Nuclear Regulatory Commission, Washington, D.C., USA, March 4, 1983
Ogilvy, J.A.: Theory of Wave Scattering from Random Rough Surfaces. Adam Hilger, Bristol, Philadelphia and New York (1991)
Dugan, S., Wagner, S., Zickler, S.: Manufacturing of test specimens with realistic defects for ultrasonic testing. In: Proceedings of the DGZfP Annual Meeting 2010, vol. 122-CD. DGZfP, Berlin (2010). Di.2.B.3 (in German)
Rieder, H., Dillhöfer, A., Spies, M., Graff, A., Orth, Th., Kersting, Th.: SAFT- and TOFD-evaluation for the ultrasonic weld inspection of longitudinally welded large diameter pipes. In: Proceedings of the DGZfP Annual Meeting 2010, vol. 122-CD. DGZfP, Berlin (2010). Mi.2.A.1 (in German)
Langenberg, K.J.: Introduction to the special issue on inverse problems. Wave Motion 11, 99–112 (1989)
Holmes, C., Drinkwater, B.W., Wilcox, P.D.: Post-processing of the full matrix of ultrasonic transmit-receive array data for non-destructive evaluation. NDT E Int. 38, 701–711 (2005)
Yonetsiji, E., Murakami, T., Braconnier, D.: Inspection of thick part with phased array volume focusing technique. In: Proceedings of the 9th European Conference on NDT, vol. 103-CD, DGZfP, Berlin (2006). We.1.2.2
Spies, M., Rieder, H., Didion, Ch., Santraine, B., Licht, R., Gebhardt, W.: A conclusive concept for three-dimensional imaging based on efficient steering and focusing of an ultrasonic 2D-array. In: Proceedings of the 9th European Conference on NDT, vol. 103-CD. DGZfP, Berlin (2006). Fr.1.1.3
Acknowledgements
The authors would like to thank the following people for their many valuable contributions: Dr. Sandra Dugan, Materialprüfanstalt MPA Stuttgart, Germany; Alfred Graff, Dr. Thomas Orth, Salzgitter-Mannesmann Forschung, Duisburg, Germany; Thomas Kersting, Europipe, Mülheim/Ruhr, Germany.
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V. Schmitz, W. Müller former affiliation, now retired.
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Spies, M., Rieder, H., Dillhöfer, A. et al. Synthetic Aperture Focusing and Time-of-Flight Diffraction Ultrasonic Imaging—Past and Present. J Nondestruct Eval 31, 310–323 (2012). https://doi.org/10.1007/s10921-012-0150-z
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DOI: https://doi.org/10.1007/s10921-012-0150-z