A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Laser induced active thermography for the visualization of transport processes in building materials
This presentation reports about the use of laser-induced thermal excitation for the monitoring of heat and moisture transport processes in building materials such as wood, brick and stone using an infrared camera With a Nd YAG laser, a point, a line or other geometries are scanned along the surface of the material under investigation. During and after excitation, the absorbed heat diffuses into the material. The surface temperature is recorded by an infrared camera as a function of time. In this paper, we present the results of two investigations. The method described above was applied to wood treated with wood preservatives in order to assess the thermal properties of the sample during the fixation process of the preservative. Different concentrations of the preservative could be detected because of their different absorption of the laser wavelength. Moisture content had the same influence for all concentrations. Thus, if the dependence of absorption of the laser wavelength on moisture content is known for one concentration of wood preservative and the dependence of the absorption on the concentration for a certain moisture content, the presented method provides a possibility to measure the surface moisture content. The method was also proven to be suitable to investigate water transport and content in sandstone.
Laser induced active thermography for the visualization of transport processes in building materials
This presentation reports about the use of laser-induced thermal excitation for the monitoring of heat and moisture transport processes in building materials such as wood, brick and stone using an infrared camera With a Nd YAG laser, a point, a line or other geometries are scanned along the surface of the material under investigation. During and after excitation, the absorbed heat diffuses into the material. The surface temperature is recorded by an infrared camera as a function of time. In this paper, we present the results of two investigations. The method described above was applied to wood treated with wood preservatives in order to assess the thermal properties of the sample during the fixation process of the preservative. Different concentrations of the preservative could be detected because of their different absorption of the laser wavelength. Moisture content had the same influence for all concentrations. Thus, if the dependence of absorption of the laser wavelength on moisture content is known for one concentration of wood preservative and the dependence of the absorption on the concentration for a certain moisture content, the presented method provides a possibility to measure the surface moisture content. The method was also proven to be suitable to investigate water transport and content in sandstone.
Laser induced active thermography for the visualization of transport processes in building materials
Kramer, Andrea (author) / Nies, Daniel (author) / Pulz, Robert (author) / Rehmer, Birgit (author) / Stephan, Ina (author) / Maierhofer, Christiane (author)
2009
10 Seiten, 9 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
Evaluation of building materials using infrared thermography
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