Measurement of High Temperatures in the DLR Solar Furnace by UV-B Detection

[+] Author and Article Information
Nicola Rohner, Andreas Neumann

German Aerospace Center (DLR), Institute for Technical Thermodynamics, Solar Research, Linder Höhe, 51147 Koln, Germany

J. Sol. Energy Eng 125(2), 152-158 (May 08, 2003) (7 pages) doi:10.1115/1.1562949 History: Received March 01, 2002; Revised December 01, 2002; Online May 08, 2003
Copyright © 2003 by ASME
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A pyrometer detects the emitted and the reflected radiation
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Spectral distribution of the concentrated, reflected sunlight in comparison to the radiation of a gray body (ε=0.8) at different temperatures, the concentration factor is c=5000
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A comparison of LOWTRAN spectra and gray body spectra in the UV-B region; Cross symbols: Spectrum 1 of concentrated sunlight; Circles: Spectrum 2 of concentrated sunlight; Squares: Spectrum 3 of concentrated sunlight (see text); and Lines: all gray bodies with ε=0.8
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Temperature error ΔT as function of wavelength and temperature, calculated for an error in emissivity of 5%
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Scheme of the experimental measurement system. The source is either a blackbody or a solar heated sample.
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Percentage variance of the determined UV temperatures by method 1 (blank symbols, 3 different configurations); and method 2 (full symbols, config1) compared to the temperature of the blackbody
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Measured radiation data and Planck fits (solid lines). The calibration temperature is 1400°C. To exemplify the accuracy, error bars are attached to the 1500°C data points.
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Percentage of deviation of the UV temperature (method 1) from the blackbody temperature Tbl for two different calibration temperatures
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Temperatures deduced by method 1 and 2 versus the wavelength (calibration at 1500°C): open symbols are the calculated temperatures from the radiation measurement; solid symbols are the mean values over the measured wavelength region; and dotted lines are Planck fits.
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Raw signal of calibration measurements at 1500°C and measurements on a magnesia sample of about 1500°C at different days and daytimes. The different interior markings of the symbols refer to series of measurements: square symbols are measured summer afternoon spectra; circle symbols refer to measured summer noon spectra.
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Temperature measurements by UV-B detection on a solar irradiated magnesia sample. The IR camera temperatures are used for reference.




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