Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)

O 58.10: Poster

Wednesday, March 28, 2012, 18:15–21:45, Poster B

Determination of single crystal emissivity by comparison with black-body radiation — •Fabian Scheepers, Sara Wanjelik, and Mathias Getzlaff — Institute of Applied Physics, University Duesseldorf

Contactless determination of temperature provides advantages towards traditional thermometers. Pyrometers allow a quick measurement up to several thousand degrees Celsius even in physically and chemically aggressive environment. Based on Planck's law, nowadays used devices are mostly limited by the knowledge of surface conditions. Ecspecially high reflective metals are the actual challenge. Their emissivity can vary over a large range. Therefore, the temperature and surface dependent correction coefficient must be known. Here we report concerning this correction for a tungsten surface; it was obtained by a spot infrared pyrometer that compared the apparent and their associated black-body radiation.The black-body was realised in the form of a cylindrical bore in the tested material and heated by electron impact. Additionally, a tungsten-based thermocouple was used for a second independent temperature determination.