TY - CONF A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Steinfurth, Henrik A1 - Augustin, Sven A1 - Mecke, R. A1 - Schiller, M. A1 - Kernchen, A. A1 - Kalisch, U. A1 - Meinhardt, J. A1 - Hennen, C. A1 - Groll, E. T. A1 - Arnold, T. T1 - Characterisation of historic façades using active thermography with solar heating and optical methods N2 - Active thermography is well suited for the detection of delaminations and cracks in façade elements like plaster and tiles. Not only artificial heating but also solar heating can be used if the adjustment of the façade and the weather conditions are suitable. Optical methods like laser scanners, photogrammetric methods and crack tracking sensors are providing geometrical 3D data which can be used for a 3D mapping of thermograms and for providing data with higher geometrical resolution. Thus, by the combination and fusion of these data, a comprehensive mapping and monitoring of damages of façade systems is possible. T2 - 19th World Conference on Non-destructive Testing (WCNDT) CY - München, Germany DA - 13.06.2016 KW - Non-destructive testing KW - Active thermography KW - Solar heating KW - Historic facades KW - Optical methods PY - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-366833 SN - 978-3-940283-78-8 VL - BB 158 SP - Mo.2.C.2., 1 EP - 8 PB - DGZfP CY - Berlin AN - OPUS4-36683 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Steinfurth, Henrik A1 - Krankenhagen, Rainer A1 - Mecke, R. A1 - Schiller, M. A1 - Kernchen, A. A1 - Kalisch, U. A1 - Hennen, C. A1 - Meinhardt, J. A1 - Groll, E.T. A1 - Arnold, T. T1 - Detection and characterisation of safety relevant detachments of facade elements using a combination of active thermography and optical scanning methods N2 - In this contribution, the development and application of optical and thermographic methods for the nondestructive evaluation of delaminations, cracks and further substructures in Connection with bulging is presented. Since delaminated fagade elements show geometric as well as thermal anomalies, surface geometry and defects beneath the surface were investigated. As methods, Stereo photogrammetry, a tracking based method for tactile recording of geometric 3D data and active thermography were used. Two case studies were assessed with a combination of these methods: the plaster scratches at the Magdeburg Cathedral and a mural painting in Cobbelsdorf, both located in Germany. While the plaster scratches have been investigated by artificial heating with an infrared radiator, the rural painting was tested by analysing the temperature increase due to solar heating. T2 - NDT-CE 2015 - International symposium non-destructive testing in civil engineering CY - Berlin, Germany DA - 15.09.2015 KW - Active thermography KW - Stereo photogrammetry KW - Tracking sensor KW - Historic plaster KW - Masonry KW - Delaminations KW - Cracks PY - 2015 SN - 1435-4934 SP - 291 EP - 300 AN - OPUS4-35106 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -