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The spectral emissivities of refractory transition metals have been measured from about 2500 K up to temperatures above the melting point T(m). The experimental method adopted is based on multiwavelength pyrometric measurements, where the determination of the spectral emissivity is implicitly related to the evaluation of temperature through the radiation emission law and an assumed relationship between the spectral emissivity and the wavelength. Heating was produced with a pulsed laser in times of the order of 100 ms. A specially constructed pyrometer was used which enabled measurements at six different wavelengths to be carried out at time intervals of the order of 0.1 ms. A model for the evaluation of temperature and spectral emissivities has been developed and its limitations arising from statistical and systematic errors are discussed.

Additional information

Authors: RONCHI C, JRC Karlsruhe (DE);HIERNAUT J P, JRC Karlsruhe (DE);HYLAND G J, University of Warwick, Department of Physics, Coventry (GB)
Bibliographic Reference: Article: Metrologia (1992) No. 29, pp. 261-271
Record Number: 199310375 / Last updated on: 1994-11-29
Original language: en
Available languages: en