Photothermal Determination of Infrared Emissivity of Selective Solar Absorbing Coatings

The infrared emissivity of glassy carbon, stainless steel, and stainless steel with a selective coating of NiNiO has been determined using a thermal-wave resonant cavity heated with a modulated laser beam. This is achieved performing a length scan of the cavity at a fixed frequency of 5 Hz. It is ob...

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Bibliographic Details
Published in:International journal of thermophysics 2015-06, Vol.36 (5-6), p.1051-1056
Main Authors: Macias, J. D., Ordonez-Miranda, J., Lizama-Tzec, F. I., Arés, O., Bante-Guerra, J., Oskam, G., de Coss, R., Alvarado-Gil, J. J.
Format: Article
Language:English
Subjects:
Classical Mechanics
Condensed Matter
Condensed Matter Physics
Industrial Chemistry/Chemical Engineering
Materials Science
Optics
Physical Chemistry
Physics
Physics and Astronomy
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Summary:The infrared emissivity of glassy carbon, stainless steel, and stainless steel with a selective coating of NiNiO has been determined using a thermal-wave resonant cavity heated with a modulated laser beam. This is achieved performing a length scan of the cavity at a fixed frequency of 5 Hz. It is observed experimentally that (1) the mechanisms of heat conduction and radiation co-exist inside the cavity, through the coupling of the dc and ac components of the temperature, and (2) the radiation effect shows up in both the amplitude and phase signals for cavity thicknesses greater than the diffusion length of the intra-cavity air. Using a suitable theoretical model, the experimental data for the amplitude and phase have allowed the determination of the infrared emissivity of the studied materials.
ISSN:0195-928X
1572-9567
DOI:10.1007/s10765-014-1614-4