Normal spectral emissivity of niobium (at 900 nm) by a pulse-heating reflectometric technique

The normal spectral emissivity of niobium strip specimens was measured using a new pulse-heating reflectometric technique. The hemispherical spectral reflectivity of the surface of a strip tangent to an integrating sphere is determined by a high-speed lock-in technique. At the same time, the radianc...

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Published in:International journal of thermophysics 1998-06, Vol.20 (4), p.1095-1106
Main Authors: Righini, F, Spisiak, J, Bussolino, G C
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Spisiak, J
Bussolino, G C
description The normal spectral emissivity of niobium strip specimens was measured using a new pulse-heating reflectometric technique. The hemispherical spectral reflectivity of the surface of a strip tangent to an integrating sphere is determined by a high-speed lock-in technique. At the same time, the radiance temperature of the strip is measured by high-speed pyrometry from approximately 1000 K to the melting point. Details of the measurement method and of the related calibration techniques are reported. Results of the normal spectral emissivity of niobium at 900 nm from room temperature to its melting point are presented, discussing differences related to the heating rate and to surface conditions.
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title Normal spectral emissivity of niobium (at 900 nm) by a pulse-heating reflectometric technique
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