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1 April 2003 Outdoor thermographic survey of historic structures
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Frequently, on outdoor thermographic surveys long wavelength infrared-thermal imaging systems are employed. When such systems are cooled, that are ideal for outdoor measurements, since they eliminate the effects of similar reflections and enhance the accuracy of the measurement. In this research study, long wavelength infrared thermography was used in the assessment of historic porous stones' masonries, either consolidated or untreated, in the Medieval City of Rhodes, in Greece. Due to the difference between the thermal diffusivities of consolidated and untreated stones or even of moist and dry stones, infrared thermography was capable of imaging large areas, displaying qualitative variations in penetration depth (i.e., consolidation) and/or respiration behavior (i.e. moisture impact), appearing as surface temperature fluctuations in the thermal image(s). The obtained thermal images provided significant information in the assessment of materials concerning moisture and consolidation treatments: monitoring of the physicochemical behavior of porous materials. Conclusively, thermography ought to be considered as a powerful nondestructive assessment tool on the investigation of historic structures.
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Antonia Moropoulou, Nicolas P. Avdelidis, and Panayiotis Theoulakis "Outdoor thermographic survey of historic structures", Proc. SPIE 5073, Thermosense XXV, (1 April 2003);


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