Emissivity measurements on historic building materials using dual-wavelength infrared thermography

2001 ◽  
Author(s):  
Antonia Moropoulou ◽  
Nicolas P. Avdelidis
Keyword(s):  
Infrared Thermography ◽  
Building Materials ◽  
Dual Wavelength ◽  
Historic Building ◽  
Emissivity Measurements

Historic building materials from Alhambra: Nanoparticles and global climate change effects

2019 ◽  
Vol 232 ◽  
pp. 751-758 ◽  
Author(s):  
Marcos L.S. Oliveira ◽  
Carolina Dario ◽  
Bernardo F. Tutikian ◽  
Hinoel Z. Ehrenbring ◽  
Caliane C.O. Almeida ◽  
...  
Keyword(s):  
Climate Change ◽  
Global Climate Change ◽  
Building Materials ◽  
Global Climate ◽  
Historic Building ◽  
Climate Change Effects

scholarly journals Material characterization models and test methods for historic building materials

2017 ◽  
Vol 132 ◽  
pp. 315-320
Author(s):  
Tessa Hansen ◽  
Ruut Hannele Peuhkuri ◽  
Eva B. Møller ◽  
Søren Peter Bjarløv ◽  
Tommy Odgaard
Keyword(s):  
Material Characterization ◽  
Building Materials ◽  
Test Methods ◽  
Historic Building

scholarly journals An Approach Method to Evaluate Wood Emissivity

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Rui Pitarma ◽  
João Crisóstomo
Keyword(s):  
Infrared Thermography ◽  
Diagnostic Technique ◽  
Environmentally Sustainable ◽  
Built Heritage ◽  
Approach Method ◽  
Useful Life ◽  
Wooden Structures ◽  
Emissivity Measurements ◽  
Environmental Importance

Throughout the ages, wood has been used in constructions. Therefore, most of the built heritage is made with wooden structures. Wood is a renewable, versatile, long-lasting, and environmentally sustainable material. It is comfortable, is aesthetically very valued, and has crucial environmental importance. Thus, being a widely used long-life material, it requires techniques for monitoring its state of integrity. Inspection needs to be done in production, in the work site, and during its useful life. Infrared thermography (IRT) is a nondestructive, noninvasive, noncontact diagnostic technique. It evaluates the surface temperature of objects based on the emitted radiation. Nevertheless, the accurate measurement of temperature is strongly dependent on the emissivity value of the material. This paper presents an expedite method to measure wood emissivity values, using active infrared thermography. Wood samples of the Pinus pinaster species were used in the experiments. The thermal contrast of the samples was performed by applying three different heating methods: conduction, convection, and radiation. The emissivity values of the three tests were compared with each other and with data from the literature, showing satisfactory results and validating the presented methodology. The procedure can also be adopted, with some adjustments, to other materials and in situ analysis, contributing to emissivity measurements.

Dual Band Infrared Thermography as a NDT Tool for the Characterization of the Building Materials and Conservation Performance in Historic Structures

1999 ◽  
Vol 591 ◽  
Author(s):  
A. Moropoulou ◽  
N.P. Avdelidis ◽  
M. Koui ◽  
N.K. Kanellopoulos
Keyword(s):  
Porous Materials ◽  
Infrared Thermography ◽  
Building Materials ◽  
Capillary Rise ◽  
Dual Band ◽  
Nondestructive Technique ◽  
Macro Scale ◽  
Historic Monuments ◽  
Repair Mortars

ABSTRACTInfrared thermography is a non-destructive investigation technique, which is largely used because of the outstanding advantages that it is capable to provide in a variety of applications and especially for conservation purposes of historic monuments, where destructive sectioning is prohibited. In the present work, dual band infrared thermography (3–5.4 μm and 8–12 μpm) is used, to evaluate the humidity distribution by capillary rise in reference samples of porous materials in lab, in order to validate the examination of real scale material systems in situ. The combined study of vapor/moisture transport in prototypes simulating porous materials under controlled environmental conditions (Relative Humidity 60–80% & Temperature 25–40°C), provides interpretation tools to the investigation by IR Thermography of transport phenomena occurring at the masonry. The cross-investigation of consolidated porous stones and of repair mortars, in lab and in situ on historic monuments in Greece, permits to evaluate the performance of conservation materials, regarding their compatibility to the porous building stones on historic masonries. It is deduced that Infrared Thermography by recording thermal maps of the real surfaces under study provides information on the differential behavior of the various materials on the masonry scale regarding the water impregnation and evaporation phenomena, which control the weathering effects in porous media. Hence, infrared thermography might be used as a nondestructive technique to evaluate on a micro and macro scale the performance of conservation interventions and materials, in compatibility to the original materials on the level of the structures.

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