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pyrometry

Laser and Particle Beams (1)

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Reliability of temperature determination from curve-fitting in multi-wavelength pyrometery
P.A. Ni, R.M. More, F.M. Bieniosek
Journal:

Laser and Particle Beams / Volume 31 / Issue 2 / June 2013

Published online by Cambridge University Press:

09 July 2013, pp. 333-336
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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.