Facility for assessing spectral normal emittance of solid materials at high temperature

Year: 2015

Authors: Mercatelli L., Meucci M., Sani E.

Autors Affiliation: CNR-INO National institute of Optics, Largo E. Fermi 6, 50125 Firenze Italy

Abstract: Spectral emittance is a key topic in the study of new compositions, depositions, and mechanical machining of materials for solar absorption and for renewable energies in general. The present work reports on the realization and testing of a new experimental facility for the measurement of directional spectral emittance in the range of 2.5-20 mu m. Our setup provides emittance spectral information in a completely controlled environment at medium-high temperatures up to 1200 K. We describe the layout and first tests on the device, comparing the results obtained for hafnium carbide and tantalum diboride ultrarefractory ceramic samples to previous quasi-monochromatic measurements carried out in the PROMES-CNRS (PROcedes, Materiaux et Energie Solaire-Centre National de la Recherche Scientifique, France) solar furnace, obtaining a good agreement. Finally, to assess the reliability of the widely used approach of estimating the spectral emittance from room-temperature reflectance spectrum, we compared the calculation in the 2.5-17 mu m spectral range to the experimental high-temperature spectral emittance, obtaining that the spectral trend of calculated and measured curves is similar but the calculated emittance underestimates the measured value. (c) 2015 Optical Society of America

Journal/Review: APPLIED OPTICS

Volume: 54 (29)      Pages from: 8700  to: 8705

More Information: Italian Ministry of University and Research (Programma “Futuro in Ricerca”, prot. RBFR12TIT1) (FIRB2012-SUPERSOLAR); The Italian Bank Foundation, Fondazione Ente Cassa di Risparmio di Firenze (2013.0726, 2014.0711); Seventh Framework Programme of the EU (SFERA) (228296).
KeyWords: Carbides; Solar furnaces, Controlled environment; Experimental facilities; Mechanical machining; Medium-High temperatures; Quasi-monochromatic; Reflectance spectrum; Renewable energies; Spectral information, Tantalum carbide
DOI: 10.1364/AO.54.008700

Citations: 13
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