TY - CONF A1 - Schlichting, Joachim T1 - Imaging Cracks by Laser Excited Thermography T2 - 36th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) CY - Kingston, RI, USA DA - 2009-07-26 PY - 2009 AN - OPUS4-19865 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schlichting, Joachim A1 - Kervalishvili, Guram N. A1 - Maierhofer, Christiane A1 - Kreutzbruck, Marc T1 - Charakterisierung von Rissen mittels Laser angeregter aktiver Thermografie T2 - Thermographie-Kolloquium 2009 CY - Stuttgart, Germany DA - 2009-10-08 PY - 2009 IS - Vortrag 19 SP - 1 EP - 7 CY - Berlin AN - OPUS4-21571 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schlichting, Joachim T1 - Geometrische Charakterisierung von Fehlstellen lokal angeregter aktiver Thermografie T2 - 15. ITG-/GMA-Fachtagung "Sensoren und Messsysteme 2010" CY - Nuremberg, Germany DA - 2010-05-18 PY - 2010 AN - OPUS4-21753 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schlichting, Joachim T1 - Geometrische Charakterisierung von Fehlstellen mittels lokal angeregter aktiver Thermografie T2 - DGZfP-Jahrestagung 2010 CY - Erfurt, Germany DA - 2010-05-10 PY - 2010 AN - OPUS4-21760 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kervalishvili, Guram N. A1 - Schlichting, Joachim A1 - Maierhofer, Christiane A1 - Kreutzbruck, Marc T1 - Heat transfer modeling of local thermal excitation for surface crack detection and characterization N2 - In the presented paper the use of local excitation (laser beam) for crack detection and characterization is simulated. As we could see, using the temperature differences between two reference points was large enough to detect and characterize the crack, even for such small value of laser power as 2 W. The influence of radiation and convection on the temperature difference was negligible (about 0.1%). The influence of heat conduction, in case of crack with air, was very small (about 3%). The main mechanism which influences the temperature differences between the reference points is the heat conduction in steel. From the presented results one can see that temperature differences are increasing with an increase of the crack depth or the crack length. Better resolution and characterization of the crack depths and lengths should be achieved with increased duration of heating time or the laser power. We could also see that the best position for the laser spot to characterize the crack is the closest one. Also, comparison of 2D and 3D simulation results for circular heat source used as local excitation mechanism had showed that only full 3D modelling will allow accomplishing a quantitative level of comparison between experimental and simulation results. T2 - ECNDT 2010 - 10th European conference on non-destructive testing CY - Moscow, Russia DA - 2010-06-07 KW - Thermography KW - Heat transfer modeling KW - Surface crack PY - 2010 SN - 978-1-617-82791-4 SP - 1 EP - 10 AN - OPUS4-22973 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kervalishvili, Guram N. A1 - Schlichting, Joachim A1 - Maierhofer, Christiane A1 - Kreutzbruck, Marc T1 - FEM modelling of heat transfer in the vicinity of vertical surface cracks using local thermal excitation T2 - Thermographie-Kolloquium 2009 CY - Stuttgart, Germany DA - 2009-10-08 KW - FEM modelling KW - Active thermography KW - Laser excitation KW - Cracks KW - Steel PY - 2009 IS - DGZfP-BB 119-CD (Poster 02) SP - 1 EP - 8 CY - Berlin AN - OPUS4-20096 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schlichting, Joachim T1 - Defect Sizing by Local Excitation Thermography T2 - 15th "Buildings Services, Mechanical and Building Industy Days" International Conference CY - Debrecen, Hungary DA - 2009-10-15 PY - 2009 AN - OPUS4-20181 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schlichting, Joachim T1 - Defect Sizing by Local Excitation Thermography T2 - 5th International Workshop Non-Destructive Testing in Progress CY - Prague, Czech Republic DA - 2009-10-12 PY - 2009 AN - OPUS4-20155 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Schlichting, Joachim A1 - Kervalishvili, Guram N. A1 - Maierhofer, Christiane A1 - Kreutzbruck, Marc ED - Mazal, Pavel T1 - Defect sizing by local excitation thermography T2 - 5th International workshop of NDT experts - NDT in progress 2009 CY - Prague, Czech Republic DA - 2009-10-12 KW - Thermography KW - Laser excitation KW - FEM modeling KW - Crack sizing PY - 2009 SN - 978-80-214-3968-9 SP - 261 EP - 270 AN - OPUS4-20333 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Schlichting, Joachim ED - Maierhofer, C. ED - Reinhardt, H.-W. ED - Dobmann, G. T1 - Active thermography for evaluation of reinforced concrete structures KW - Active thermography KW - Pulse-phase thermography KW - Emissivity KW - Reinforced concrete KW - Subsurface defects PY - 2010 SN - 978-1-84569-950-5 VL - 2 IS - Chapter 17 SP - 370 EP - 402 PB - Woodhead Publ. AN - OPUS4-22611 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Schlichting, Joachim A1 - Kervalishvili, Guram N. A1 - Maierhofer, Christiane A1 - Kreutzbruck, Marc T1 - Defect sizing by local excitation thermography T2 - 15th International conference "Building services, mechanical and building industry days" CY - Debrecen, Hungary DA - 2009-10-15 KW - Thermography KW - Laser excitation KW - FEM Modeling KW - Crack sizing PY - 2009 SN - 978-963-473-315-7 SP - 67 EP - 76 AN - OPUS4-20655 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -