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TECHNICAL PAPERS

Pyrometric Temperature Measurements in Solar Furnaces

[+] Author and Article Information
Hans Rudolf Tschudi

Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

Gerd Morian

IMPAC Electronic GmbH, Krifteler Straße 32, DE-60326 Frankfurt/Main, Germany

J. Sol. Energy Eng 123(2), 164-170 (Jan 01, 2001) (7 pages) doi:10.1115/1.1355035 History: Received July 01, 2000; Revised January 01, 2001
Copyright © 2001 by ASME
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References

Figures

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Experimental setup for the flash assisted multi wavelength pyrometry (FAMP)
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The solar-blind pyrometer
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Transmittance of the filter used in the solar-blind pyrometer together with an AM1.5 irradiance spectrum of the sun
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Temperature deviations of a solar-blind pyrometer due to solar radiation (solid lines) and to emittance errors (dashed lines) as functions of temperature. In order to establish a correlation between temperature and irradiance, the equilibrium irradiation Eeq of a body for a given temperature is also presented (thick solid line). One sun corresponds to a total radiant flux of 1 kW m−2. The example discussed in the text is based on the total irradiance E=4000 suns, the emittance ε=0.8, and Eeq=800 suns (dotted lines).
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Comparison of FAMP temperatures (open circles with 95% confidence intervals) with solar-blind pyrometer reading (solid line). The dashed line gives the solar input before concentration (arbitrary units). The solid circles indicate the spectral reflectances averaged over the interval [820 nm, 960 nm] measured with FAMP.
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Comparison of FAMP (open circles) with solar-blind pyrometer temperatures (solid line). The FAMP temperatures are calculated with the spectral reflectance averaged over all indicated FAMP measurements.
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FAMP temperatures calculated with a mean spectral reflectance (see Fig. 7) are plotted versus the corresponding individual mean spectral reflectances of the interval [820 nm, 960 nm] (see Fig. 6). The two irradiance regimes are treated separately (solid circles: high irradiation, open circles: low irradiation). The solid curves indicate the least-square fit lines; the dotted lines indicate the 95 percent confidence limits of its slope. The points should cluster around the dashed lines if the fluctuations of the temperature output were caused by emittance fluctuations.

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