Measurement of High Temperatures in the DLR Solar Furnace by UV-B Detection
Author:
Rohner Nicola1, Neumann Andreas1
Affiliation:
1. German Aerospace Center (DLR), Institute for Technical Thermodynamics, Solar Research, Linder Ho¨he, 51147 Koln, Germany
Abstract
The correct selection of the operating wavelength is essential for a precise pyrometric temperature measurement on solar irradiated samples, as the measurement may be disturbed by reflected solar radiation. Atmospheric conditions and particularly the material emissivity have an impact on these measurements. As an approach to solve this problem, we developed a new system that uses the UV-B wavelength range for pyrometry. Simulations and measurements on blackbodies and on real hot bodies heated in the DLR Solar Furnace specified the final measurement wavelength to be in the range of 280–292 nm. A sensitive monochromator system for this UV-B pyrometry was developed and experimentally tested. Measurements in the range of 1320-1500°C on a blackbody without solar irradiation and measurements from 1500°C to about 2400°C on a real solar heated sample are presented and discussed. Final calibration was performed by using blackbody radiation of 1500°C. Two calculation methods are compared. The influence of the calibration temperature on the quality of the measurement is shown. In this first approach, the resolution of the system turned out to be in the order of magnitude of 1 K and the accuracy in the order of magnitude of 10 K.
Publisher
ASME International
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
Reference9 articles.
1. Neumann, A., and Groer, U., 1996, “Experimenting with Concentrated Sunlight Using the Solar Furnace,” Sol. Energy, 58, pp. 181–190. 2. Harrison, T. R., 1960, Radiation Pyrometry and its Underlying Principles of Radiant Heat Transfer, John Wiley & Sons, Inc., New York. 3. De Witt, D. P., and Nutter, G. D., 1988, Theory and Practice of Radiation Thermometry, John Wiley & Sons, Inc., New York. 4. Tschudi, H.-R., and Mu¨ller, Ch., 2000, “Pyrometric Temperature Measurements in the Solar Furnace,” 10th SolarPACES Int. Symp. on Solar Thermal Conc. Technologies: Solar Thermal 2000, Sydney, Australia, 1, pp. 269–273. 5. Tschudi, H. R., and Morian, G., 2001, “Pyrometric Temperature Measurements in Solar Furnaces,” ASME J. Sol. Energy Eng., 123, pp. 164–170.
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