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Reliability of temperature determination from curve-fitting in multi-wavelength pyrometery

Published online by Cambridge University Press:  09 July 2013

P.A. Ni ,
R.M. More  and
F.M. Bieniosek
P.A. Ni*
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, California
R.M. More
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, California
F.M. Bieniosek
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, California
*
Address correspondence and reprint requests to P.A. Ni, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. E-mail: pani@lbl.gov
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Abstract

This paper examines the reliability of a widely used method for temperature determination by multi-wavelength pyrometry. In recent warm dense matter experiments with ion-beam heated metal foils, we found that the statistical quality of the fit to the measured data is not necessarily a measure of the accuracy of the inferred temperature. We found a specific example where a second-best fit leads to a more realistic temperature value. The physics issue is the wavelength-dependent emissivity of the hot surface. We discuss improvements of the multi-frequency pyrometry technique, which will give a more reliable determination of the temperature from emission data.

Keywords

Heavy ion beam heatingPyrometryTemperature measurementWarm dense matter
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 2 , June 2013 , pp. 333 - 336
Copyright
Copyright © Cambridge University Press 2013 

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References

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