Title of article :
Normal Spectral Emissivity of Niobium (at 900 nm) by a Pulse-Heating Reflectometric Technique
Author/Authors :
F. Righini، نويسنده , , J. Spi?iak and G. C. Bussolino ، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1999
Abstract :
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 iIntegrating 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 1000K 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 preseInted,
discussing differences related to the heating rate and to surface conditions
Keywords :
niobium , pulseheating , transient techniques. , normal spectral emissivity , reflectometric techniques , high temperatures , refractory metals
Journal title :
International Journal of Thermophysics
Journal title :
International Journal of Thermophysics