Stainless steel material samples with different surface roughness values were investigated to determine their spectral directional emissivity at elevated temperatures up to 1200 K in the visible to near-infrared wavelength range and in the infrared around 4    μ m . The emissivity measurements were accomplished by measuring the radiation from an appropriately designed test specimen in a furnace heating facility with optical access. Blackbody radiation, needed to determine the emissivity, was generated through a cavity in the specimen itself. During the time of measurement, the sample was shielded from the furnace radiation through a retractable cold radiation shield. In the visible to near-infrared wavelength range, the specimen was imaged on the entrance slit of a 500 mm focal length spectrometer, enabling simultaneous measurement of a sample normal to the viewing direction, the blackbody cavity, and a tilted sample. In the infrared, a FLIR camera was used to image filtered radiation around 4    μ m . Surface roughness increased emissivity significantly in comparison to polished samples. The actual roughness values only had minor effects. Preoxidation of the samples caused a significant increase in emissivity for polished surfaces but had only minor effects for rough samples. The measured emissivities show only a weak variation with temperature.


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    Titel :

    Spectral, Directional Emittance of Stainless Steel at Elevated Temperatures


    Beteiligte:
    Winter, Michael (Autor:in) / Bickel, Robert (Autor:in) / Sekulic, Dusan P. (Autor:in) / Koch, Helmut (Autor:in) / Fu, Hai (Autor:in) / Butler, Bradley (Autor:in) / Wilder, Michael C. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2018-12-12


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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