TY - JOUR A1 - Mayer, K. A1 - Langenberg, K.-J. A1 - Krause, Martin A1 - Milmann, Boris A1 - Mielentz, Frank T1 - Characterization of reflector types by phase-sensitive ultrasonic data processing and imaging JF - Journal of nondestructive evaluation N2 - Ultrasonic and radar imaging techniques are limited in resolution by the wavelength in the material, yet information beyond those limits is hidden in complex frequency dependent reflection coefficients. The analysis of the phase of complex reflection coefficients together with the properties of imaging algorithms can help to characterize and to classify indications of defects in concrete buildings. This paper describes a method to extract phase information from measurements and SAFT reconstructed images. The influencing factors like material properties, transducer characteristics, and imaging algorithms based on Born or Physical Optics approximations are elaborated. Simulated and experimental results are briefly discussed. KW - NDT KW - Imaging KW - Flaw characterization KW - Tendon ducts KW - Phase analysis KW - Ultrasonic echo KW - SAFT KW - FT-SAFT KW - EFIT-modeling KW - Modellierung KW - EFIT KW - Spannbeton KW - Ultraschallecho KW - Spannkanäle KW - Verpressfehler KW - Zerstörungsfreie Prüfung im Bauwesen KW - ZfP-Bau PY - 2008 DO - https://doi.org/10.1007/s10921-008-0035-3 SN - 0195-9298 SN - 1573-4862 VL - 27 IS - 1-3 SP - 35 EP - 45 PB - Plenum Press CY - New York, NY AN - OPUS4-17926 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Krause, Martin A1 - Milmann, Boris A1 - Mielentz, Frank A1 - Streicher, Doreen A1 - Redmer, Bernhard A1 - Mayer, K. A1 - Langenberg, K.-J. A1 - Schickert, M. T1 - Ultrasonic Imaging Methods for Investigation of Post-tensioned Concrete Structures: A Study of Interfaces at Artificial Grouting Faults and Its Verification JF - Journal of nondestructive evaluation N2 - This paper presents the progress of successful location of grouting faults in tendon ducts with ultrasonic imaging. The examples were obtained in the research group FOR 384 funded by DFG (German Research Foundation). The co-operation of experimental research and modeling allowed imaging and identification of grouted and ungrouted areas of tendon ducts (including strands) in a large test specimen (40 m²). In addition to the criteria for indicating grouting faults in post-tensioned ducts known until now the phase evaluation of reflected ultrasonic pulses is described. Experiments and modeling of wave propagation are presented for reflections at metal plates in concrete (thickness range 0.5 mm to 40 mm) and for tendon ducts including strands. The main part of the progress was achieved by automated measurements using dry contact transducers, 3D-SAFT reconstruction including phase evaluation and modeling considering wave propagation for typical elastic parameters and exact experimental site conditions. The results for shear waves as well as for pressure waves are compared in the frequency range from 50 kHz to 120 kHz. KW - Non-destructive testing KW - Tendons KW - Prestressed concrete bridges KW - Ultrasonic echo KW - Reconstruction calculation KW - 3D-SAFT KW - Modeling (EFIT) PY - 2008 DO - https://doi.org/10.1007/s10921-008-0033-5 SN - 0195-9298 SN - 1573-4862 VL - 27 IS - 1-3 SP - 67 EP - 82 PB - Plenum Press CY - New York, NY AN - OPUS4-17922 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Milmann, Boris A1 - Krause, Martin A1 - Mielentz, Frank A1 - Mayer, K. T1 - Ultraschallecho-Verfahren für Spannbeton: Signifikanter Nachweis von Verpressfehlern mit Phasenauswertung T2 - Praktische Anwendungen Zerstörungsfreier Prüfungen und Zukunftsaufgaben - Tagungsband der Fachtagung Bauwerksdiagnose 2008 T2 - Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen und Zukunftsaufgaben CY - Berlin, Deutschland DA - 2008-02-21 KW - Ultraschallecho KW - Spannbeton KW - Verpressfehler KW - Modellierung KW - Polarimetrische Abbildungsverfahren PY - 2008 SN - 978-3-940283-08-5 N1 - Serientitel: Berichtsband der Deutschen Gesellschaft für Zerstörungsfreie Prüfung – Series title: Berichtsband der Deutschen Gesellschaft für Zerstörungsfreie Prüfung IS - 112 SP - 1 EP - 11 (Beitrag 11) PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung CY - Berlin AN - OPUS4-18280 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Krause, Martin A1 - Mielentz, Frank A1 - Milmann, Boris A1 - Streicher, Doreen A1 - Mayer, K. T1 - Ultrasonic Reflection Properties at Interfaces Between Concrete Steel and Air: Imaging and Modelling T2 - NDE Conference on Civil Engineering T2 - NDE Conference on Civil Engineering CY - St. Louis, Missouri, USA DA - 2006-08-14 KW - Ultrasonic echo KW - Concrete PY - 2006 SN - 1-57117-148-7 SP - 472 EP - 479 PB - ASTM CY - St. Louis AN - OPUS4-14239 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Krause, Martin A1 - Milmann, Boris A1 - Schickert, M. A1 - Mayer, K. T1 - Investigation of Tendon Ducts by Means of Ultrasonic Echo Methods - A Comparative Study T2 - 9th European Conference on NDT T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - NDT-CE KW - Concrete KW - Tendon ducts KW - Ultrasonic echo KW - Ultrasonic imaging KW - Grouting faults PY - 2006 SN - 3-931381-86-2 SP - 1(?) EP - 12(?) PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-14224 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Mayer, K. A1 - Langenberg, K.-J. A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Milmann, Boris A1 - Kohl, Christoph T1 - Characterization of ultrasonic and radar reflector types in concrete by phase evaluation of the signal and the reconstructed image T2 - 9th European Conference on NDT T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - NDT-CE KW - Ultrasonic echo KW - Radar KW - Phase evaluation KW - Modeling of wave propagation KW - Reconstruction calculation PY - 2006 SN - 3-931381-86-2 SP - 1 EP - 8(?) PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-14225 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Krause, Martin A1 - Mielentz, Frank A1 - Milmann, Boris A1 - Mayer, K. T1 - Objektabbildung mit scannenden Ultraschallecho-Verfahren T2 - Verkehrsbauten - Flächentragwerke (Beton-Kalender 2007) KW - ZfPBau KW - Ultraschallecho KW - Betonbauteile KW - Spannkanäle KW - Phased Array KW - Rekonstruktionsrechnung KW - Modellierung elastischer Wellen PY - 2006 SN - 978-3-433-01833-0 SN - 0342-7617 VL - 1 IS - Kap. V / Abschnitt 8 SP - 543 EP - 554 PB - Ernst CY - Berlin AN - OPUS4-14272 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mayer, K. A1 - Milmann, Boris A1 - Krause, Martin A1 - Mielentz, Frank T1 - Methode zum Nachweis von Verpressfehlern in Spannbeton durch Phasenauswertung bei Ultraschallecho-Verfahren JF - ZfP-Zeitung KW - Ultraschall-Echo-Verfahren KW - Verpressfehler KW - Spannbeton KW - Hüllrohr KW - Brücken PY - 2008 SN - 1616-069X SN - 0948-5112 VL - 112 IS - 12 SP - 37 EP - 40 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung CY - Berlin AN - OPUS4-18685 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Krause, Martin A1 - Gräfe, Boris A1 - Mielentz, Frank A1 - Milmann, Boris A1 - Friese, Martin A1 - Wiggenhauser, Herbert A1 - Mayer, K. ED - M.G. Alexander, ED - H.-D. Beushausen, ED - F. Dehn, ED - P. Moyo, T1 - Ultrasonic imaging of post-tensioned concrete elements: New techniques for reliable localization of grouting defects T2 - Proceedings of the international conference on concrete repair, rehabilitation and retrofitting II T2 - 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting CY - Cape Town, South Africa DA - 2008-11-24 KW - Post-tensioned concrete KW - Ultrasonic echo KW - Phase evaluation KW - Air-coupled ultrasound PY - 2009 SN - 978-0-415-46850-3 SP - 521 EP - 527 PB - CRC Press CY - Boca Raton AN - OPUS4-20651 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Krause, Martin A1 - Mayer, K. A1 - Friese, Martin A1 - Milmann, Boris A1 - Mielentz, Frank A1 - Ballier, G. ED - Odile Abraham, ED - Dérobert, Xavier T1 - Progress in ultrasonic tendon duct imaging T2 - NDTCE `09 - 7th international symposium on non destructive testing in civil engineering (Proceedings) T2 - NDTCE `09 - 7th international symposium on non destructive testing in civil engineering CY - Nantes, France DA - 2009-06-30 KW - Reconstruction calculation KW - SAFT KW - EFIT Modelling KW - Prestressed concrete structures PY - 2009 SN - 978-2-7208-2542-5 SN - 1628-4704 IS - Paper 77 SP - 147 EP - 154 AN - OPUS4-20652 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -