Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 52: Poster Session - New Methods: Experiments

O 52.5: Poster

Tuesday, March 17, 2020, 18:15–20:00, P2/1OG

Temperature measurement by a pyrometer: Determination of the emissivity coefficient and influencing factors — •Robert Decke, Mate Puljiz, and Mathias Getzlaff — Institute of Applied Physics, University of Duesseldorf

Pyrometers represent an elegant tool for the contactless measurement of temperatures. This technique is especially important under vacuum or aggresive conditions. Additionally, high temperatures can be determined. For a correct procedure the emissivity coefficient must be known which is a measure for the difference of the emitted light intensity at a specific wave length between a black body and the real object. The goal of this study was therefore to investigate the influencing factors of this coefficient.

Here we report on the investigation of a W(110) crystal at different temperatures with pyrometers working at two different wave lengths. The real surface temperature was monitored using a thermocouple. The influence of the setup, the focus condition of the pyrometer optics, the wave length and the angle between the surface normal and the detection direction will be shown.