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

Year: 1999

Authors: Righini F., Spisiak J., Bussolino GC.

Autors Affiliation: CNR Ist. di Metrologia G. Colonnetti, strada delle Cacce 73, 10135 Torino, Italy; Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia

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 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.

Journal/Review: INTERNATIONAL JOURNAL OF THERMOPHYSICS

Volume: 20 (4)      Pages from: 1095  to: 1106

More Information: Vedecká Grantová Agentúra MŠVVaŠ SR a SAV, VEGA. – One of the authors (J.S.) gratefully acknowledgesthe financial support received from the Slovak Grant Agency (VEGA) under Contract2/5084/98. – Commissariat a l
KeyWords: high temperatures; niobium; normal spectral emissivity;; pulse heating; reflectometric techniques
DOI: 10.1023/A:1022602820071

Citations: 29
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