期刊名称：Advances in Science and Technology Research Journal
印刷版ISSN：2080-4075
电子版ISSN：2299-8624
出版年度：2020
卷号：14
期号：2
页码：215-222
DOI：10.12913/22998624/118103
语种：English
出版社：Society of Polish Mechanical Engineers and Technicians
摘要：The article discusses the impact of surface emissivity on the thermograms, obtained from a thermal imagingcamera during the measurements of construction objects. The study was carried out as an analysis of the digitaland thermal images for three selected materials types of building fnishing such as: wood outside doors, cementlime plaster and glass façade. The images obtained from the exterior and from the interior of the buildings werecompared and analyzed in terms of the spectrum intensity within the range of ambient temperature. The result ofthe conducted research shows how important it is to use both side images for such details as locks, door knobsand handles to properly assess the optional light reflections, especially on glossy surfaces. The influence of themost signifcant factors on the surface emissivity, such as direction of emission θ, surface temperature TS, radiation wavelength λ, time τ, was discussed on the basis of the experiment. The measurements were made using aFlir T440bx thermal imaging camera, while for the analysis of thermal images and the generation of graphs, theFlir Tools+ 6.4.18039.1003 software was used. For all tested materials, the emissivity value was estimated usinga camera and black insulating tape characterized by a known emissivity value ε = 0.98. The study of materialswith different emissivity under the reference conditions helped to identify the influence of material reflectivity onthe obtained temperature spectrum values and to correctly perform the research. The temperature ranged between269–293 K, but in particular measurements, the range was reduced. The thermal images reveals additional unexpected details of insulation discontinuity, the indication of which is necessary for building modernization. Thewood door joinery research showed the leakage, which disqualifes them from use in low energy buildings in muchmore defnite way because the temperature range resulting from heat outflow approaches even 15 K. The use ofglass wind insulation boards can eliminate the wood door icing, which occurs at a temperature of about 268 K, andat the same time, increase the temperature of the shielded door by about 10 K.
关键词：surface emissivity; thermal imaging; building structural materials
