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15 March 2002 Role of emissivity in infrared thermographic imaging and testing of building and structural materials
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Abstract
Emissivity can be defined as an expression that describes the optical properties of a material in sense of the extent of energy emitted with regard to an ideal black body. Since there is no infrared camera that can read temperature directly, correct emissivity values ought to be measured with the intention of interpreting thermal images obtained from thermographic surveys. In the present work, the emissivity values of numerous building and structural materials, such as stones, plasters, mortars, marbles and mosaics' tesserae, were calculated in accordance with the relevant ASTM standard approach or by the use of an empirical laboratory developed approach. The obtained emissivity values were discussed and explained in terms of the approach used, the wavelength effect, as well as the materials surface condition.
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Antonia Moropoulou and Nicolas P. Avdelidis "Role of emissivity in infrared thermographic imaging and testing of building and structural materials", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); https://doi.org/10.1117/12.459576
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