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Spectral emissivities and optical constants of electromagnetically levitated liquid metals as functions of temperature and wavelengthThe development of a noncontact temperature measurement device utilizing rotating analyzer ellipsometry is described. The technique circumvents the necessity of spectral emissivity estimation by direct measurement concomittant with radiance brightness. Using this approach, the optical properties of electromagnetically levitated liquid metals Cu, Ag, Au, Ni, Pd, Pt, and Zr were measured in situ at four wavelengths and up to 600 K superheat in the liquid. The data suggest an increase in the emissivity of the liquid compared with the incandescent solid. The data also show moderate temperature dependence of the spectral emissivity. A few measurements of the optical properties of undercooled liquid metals were also conducted. The data for both solids and liquids show excellent agreement with available values in the literature for the spectral emissivities as well as the optical constants.
Document ID
19900008591
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Krishnan, S. (Intersonics, Inc., Northbrook IL., United States)
Hauge, R. H. (Houston Research Inc., TX., United States)
Margrave, J. L. (Rice Univ. Houston, TX., United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1989
Publication Information
Publication: JPL, Proceedings of the Second Noncontact Temperature Measurement Workshop
Subject Category
Instrumentation And Photography
Accession Number
90N17907
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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