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  • X-points in the spectral emissivity of solid and liquid refractory transition metals measured by multichannel pyrometry : Discussion of the experimental method and physical interpretation

Abstract

The spectral emissivities of refractory transition metals have been measured from about 2,500 K up to temperatures above the melting point. 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 due to 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: EUR 14220 EN (1993) 49 pp., FS, ECU 8.50
Availability: (2)
ISBN: ISBN 92-826-5699-3
Record Number: 199310636 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en