Ultrasonic Imaging of Concrete Elements Using Reconstruction by Synthetic Aperture Focusing Technique
Publication: Journal of Materials in Civil Engineering
Volume 15, Issue 3
Abstract
Ultrasonic reconstruction by the synthetic aperture focusing technique (SAFT) has a great potential to image concrete elements and detect embedded objects. Its algorithm focuses ultrasonic signals received at many aperture points by coherent superposition, yielding a high-resolution image of the region of interest. Using this approach, several problems caused by the strongly inhomogeneous structure of concrete are diminished, where scattering of transmitted pulses leads to disturbing phenomena such as attenuation and structural noise. This contribution is intended to review the work of the writers on the application of SAFT reconstruction to concrete testing. First, consequences of scattering of ultrasonic waves in concrete are qualitatively explained. Then the use of SAFT is discussed in comparison to traditional A-scan and B-scan techniques. Different reconstruction algorithms and implementations are presented for one-, two-, and three-dimensional SAFT. Pulse-echo measurement systems are described, which are able to acquire large sets of data on linear and planar apertures employing single transducer, transducer array, and scanning laser Doppler vibrometer arrangements. To illustrate the application of the SAFT techniques, examples from laboratory and field experiments are described comprising imaging of back walls, tendon ducts containing faults, layers, and reinforcement in concrete elements.
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References
Colla, C., Krause, M., Maierhofer, C., Henschen, J., Höhberger, H., and Sommer, H.(2002). “Combination of NDT techniques for site investigation of non-ballasted railway tracks.” NDT & E Int., 35, 95–105.
Frederick, J. R., Seydel, J. A., and Fairchild, R. C. (1976). “Improved ultrasonic non-destructive testing of pressure vessels.” Rep. No. NUREG-0007-1 prepared for the U.S. Nuclear Regulatory Commission, Univ. of Michigan, Department of Mechanical Engineering, Ann Arbor, Mich.
Hillger, W., and Neisecke, J.(1993). “Qualitätssicherung mineralischer Baustoffe durch neue Ultraschall-Impuls-Echo-Technik.” Betonwerk+Fertigteil-Technik, 59(6), 82–89.
Jansohn, R., and Schickert, M. (1998). “Objective interpretation of ultrasonic concrete images.” Proc., 7th European Conf. on Non-Destructive Testing (ECNDT), 7th ECNDT, Broendby, Denmark, 808–815.
Köhler, B., Hentges, G., and Müller, W.(1998). “Improvement of ultrasonic testing of concrete by combining signal conditioning methods, scanning laser vibrometer and space averaging techniques.” NDT & E Int., 31(4), 281–287.
Kovalev, A. V., Kozlov, V. N., Samokrutov, A. A., Shevaldykin, V. G., and Yakovlev, N. N.(1990). “Pulse-echo technique for concrete inspection. Interferences and spatial selection.” Defektoskopiya, 2, 29–41 (in Russian).
Krause, M., Bärmann, R., Frielinghaus, R., Kretzschmar, F., Kroggel, O., Langenberg, K., Maierhofer, Ch., Müller, W., Neisecke, J., Schickert, M., Schmitz, V., Wiggenhauser, H., and Wollbold, F.(1997a). “Comparison of pulse-echo methods for testing concrete.” NDT & E Int., 30(4), 195–204.
Krause, M., Mielentz, F., Milman, B., Wiggenhauser, H., Müller, W., and Schmitz, V.(2001). “Ultrasonic imaging of concrete members using an array system.” NDT & E Int., 34, 403–408.
Krause, M., Müller, W., and Wiggenhauser, H.(1997b). “Ultrasonic inspection of tendon ducts in concrete slabs using 3D-SAFT.” Acoust. Imaging, 23, 433–439.
Krause, M., Schickert, G., Wiggenhauser, H., Wilsch, G., and Wüstenberg, H. (1992). “Ultraschall-Impulsecho zur zerstörungsfreien Prüfung an Bauteilen aus Beton.” Proc., DGZfP-Jahrestagung 1992, Deutsche Gesellschaft für Zerstörungsfreie Prüfung, Berlin, 214–221.
Krause, M., and Wiggenhauser, H. (2001). “Ultrasonic testing in civil engineering.” Proc., NDT in Progress, Czech Society for Nondestructive Testing, Prague, Czech Republic, 17–28.
Krause, M., Wiggenhauser, H., and Wilsch, G. (1993). “Advanced pulse echo method for ultrasonic testing of concrete.” Proc., Nondestructive Testing in Civil Engineering, British Institute of Nondestructive Testing, Northampton, England, 821–827.
Krautkrämer, J., and Krautkrämer, H. (1990). Ultrasonic testing of materials, Springer, New York.
Krieger, J., Krause, M., and Wiggenhauser, H.(1998). “Tests and assessments of NDT methods for concrete bridges.” Structural materials technology III, R. D. Medlockand D. C. Laffrey, eds., Proc. SPIE, 3400, 258–269.
Langenberg, K.-J. (1987). “Applied inverse problems.” Basic methods of tomography and inverse problems, P. C. Sabatier, ed., Adam Hilger, Bristol, England.
Malhotra, V. M., ed. (1984). Proc., In Situ/Nondestructive Testing of Concrete, SP-82, American Concrete Institute, Detroit.
Marklein, R., Langenberg, K. J., Bärmann, R., Mayer, K., and Klaholz, S.(1996). “Nondestructive testing with ultrasound: Numerical modeling and imaging.” Acoust. Imaging, 22, 757–764.
Mayer, K. (1990). “Ultraschallabbildungsverfahren: Algorithmen, Methoden der Signalverarbeitung und Realisierung.” Doctoral dissertation, Universität-Gesamthochschule Kassel, Kassel, Germany.
Mayer, K., Marklein, R., Langenberg, K. J., and Kreutter, T.(1990). “Three-dimensional imaging system based on Fourier transform synthetic aperture focusing technique.” Ultrasonics, 28, 241–255.
Müller, W. (1994). “Betonprüfung.” IZFP Rep. No. 940109-E, Institut für Zerstörungsfreie Prüfverfahren, Saarbrücken, Germany.
Müller, W., Schmitz, V., and Schäfer, G. (1983). “Defect sizing and classification using HOLOSAFT.” Proc., 6th Int. Conf. NDE in the Nuclear Industry, American Society for Metals, Metal Park, Ohio, 153–158.
Müller, W., Schmitz, V., and Schäfer, G. (1985). “Imaging defects by one-dimensional synthetic aperture focusing technique.” Proc., 7th Int. Conf. NDE in the Nuclear Industry, American Society for Metals, Metal Park, Ohio, 301–304.
Popovics, S., Rose, J. L., and Popovics, J. S.(1990). “The behaviour of ultrasonic pulses in concrete.” Cem. Concr. Res., 20, 259–270.
RILEM. (1972). “Testing of concrete by the ultrasonic pulse method.” RILEM NDT 1, Cachan, France.
Schickert, M. (1995). “Towards SAFT imaging in ultrasonic inspection of concrete.” Proc., Int. Symposium on Non-Destructive Testing in Civil Engineering (NDT-CE), Deutsche Gesellschaft für Zerstörungs-freie Prüfung, Berlin, 411–418.
Schickert, M. (1996). “Erhöhte Abbildungsgenauigkeit bei der Ultraschallprüfung von Beton durch SAFT mit nichtlinearen Zeitskalen.” Proc., DACH-Jahrestagung 1996, Deutsche Gesellschaft für Zerstörungsfreie Prüfung, Berlin, 447–452.
Schickert, M. (1998). “Ein empirisches Modell der frequenzabhängigen Schallschwächung von Beton.” Proc., DGZfP-Jahrestagung 1998, Deutsche Gesellschaft für Zerstörungsfreie Prüfung, Berlin, 233–240.
Schickert, M. (1999). “Ein empirisches Modell der Dispersion von Ultraschall in Beton.” Proc., DGZfP-Jahrestagung 1999, Deutsche Gesellschaft für Zerstörungsfreie Prüfung, Berlin, 559–566.
Schickert, M. (2000). “Anwendung der SAFT-Rekonstruktion bei der Betonprüfung mit Ultraschall.” Proc., DGZfP-Jahrestagung 2000, Deutsche Gesellschaft für Zerstörungsfreie Prüfung, Berlin, 537–546.
Schickert, M., Schnapp, J. D., Kroggel, O., and Jansohn, R. (2001). “Ultraschallprüfung von Beton: Verbesserte Objekterkennung durch stochastische Methoden.” Proc., DGZfP-Jahrestagung 2001 (CD-Rom), Deutsche Gesellschaft für Zerstörungsfreie Prüfung, Berlin, V44.
Schubert, F., and Köhler, B. (1997). “Numerical modeling of ultrasonic attenuation and dispersion in concrete. The effect of aggregates and porosity.” Proc., Nondestructive Testing in Civil Engineering (NDT-CE), British Institute of Nondestructive Testing, Northampton, England, Vol. 1, 143–157.
Shevaldykin, V. G., Kozlov, V. N., and Samokrutov, A. A. (1998). “Inspection of concrete by ultrasonic pulse-echo tomograph with dry contact.” Proc., 7th European Conf. on Non-Destructive Testing (ECNDT), 7th ECNDT, Broendby, Denmark, 816–821.
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Copyright © 2003 American Society of Civil Engineers.
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Received: May 7, 2002
Accepted: Jul 12, 2002
Published online: May 15, 2003
Published in print: Jun 2003
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