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Development and Evaluation of an Improved Apparatus for Measuring the Emissivity at High Temperatures

  • An improved apparatus for measuring the spectral directional emissivity in the wavelength range between 1 µm and 20 µm at temperatures up to 2400 K is presented in this paper. As a heating unit an inductor is used to warm up the specimen, as well as the blackbody reference to the specified temperatures. The heating unit is placed in a double-walled vacuum vessel. A defined temperature, as well as a homogenous temperature distribution of the whole surrounding is ensured by a heat transfer fluid flowing through the gap of the double-walled vessel. Additionally, the surrounding is coated with a high-emitting paint and serves as blackbody-like surrounding to ensure defined boundary conditions. For measuring the spectral directional emissivity at different emission angles, a movable mirror is installed in front of the specimen, which can be adjusted by a rotatable arrangement guiding the emitted radiation into the attached FTIR-spectrometer. The setup of the emissivity measurement apparatus (EMMA) and the measurement procedure are introduced, and the derived measurement results are presented. For evaluating the apparatus, measurements were performed on different materials. The determined emissivities agree well with values published in literature within the derived relative uncertainties below 4% for most wavelengths.

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Metadaten
Author:Hartmann Jürgen, Mariacarla Arduini, Jochen Manara, Thomas Stark, Hans-Peter Ebert
Persistent identifier:https://www.mdpi.com/1424-8220/21/18/6252
DOI:https://doi.org/10.3390/s21186252
ISSN:1424-8220
Parent Title (English):Sensors
Document Type:Article
Language:English
Year of publication:2021
Publishing Institution:Hochschule für Angewandte Wissenschaften Würzburg-Schweinfurt
Release Date:2021/11/08
Tag:Emissivität; Temperatur
emissivity; high temperature; infrared radiation; reflectivity
Volume:21
Issue:18
Institutes and faculty:Fakultäten / Fakultät Elektrotechnik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 536 Wärme
Regensburger Klassifikation:Physik
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