Improving the Dynamic Emissivity Measurement Above 1000 K by Extending the Spectral Range

TEMPMEKO 2016
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Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 12th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science

Abstract

To improve the dynamic emissivity measurement, which is based on the laser-flash method, an array spectrometer is characterized regarding its spectral radiance responsivity for a spectrally resolved emissivity measurement above \(1000\,\)K in the wavelength range between \(550\,\)nm and \(1100\,\)nm. Influences like dark signals, the nonlinearity of the detector, the size-of-source effect, wavelength calibration and the spectral radiance responsivity of the system are investigated to obtain an uncertainty budget for the spectral radiance and emissivity measurements. Uncertainties for the spectral radiance of lower than a relative \(2\,\%\) are achieved for wavelengths longer than \(550\,\)nm. Finally, the spectral emissivity of a graphite sample was determined in the temperature range between \(1000\,\)K and \(1700\,\)K, and the experimental data show a good repeatability and agreement with literature data.

Keywords

Emissivity Graphite High temperature Laser flash Spectrometry 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Physikalisch-Technische BundesanstaltBerlinGermany

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