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Near infrared absorption coefficient of molten glass by emission spectroscopy

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Abstract

Emission spectroscopy is applied in the determination of the near infrared spectral absorption coefficient of molten glass. The glass is held in a small horizontal platinum alloy crucible, within an electrically heated cell, optically coupled to a Fourier transform spectrometer. A formula is derived which relates emissivity to absorption coefficient, thickness, and reflectivities for the glass-air and glass-metal interfaces. The reflectivity parameters are determined, in effect, by varying the thickness. Spectral absorption coefficient results are compared with results of transmission spectroscopy. The emission technique is advantageous in that it eliminates the problem of chemical reactions with window materials used in the transmission method, and sample preparation and interfacing to commercially available spectrometers is simplified.

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Authors and Affiliations

  1. Research and Development Division, Owens-Corning Fiberglass Corporation, Technical Center, 43023, Granville, Ohio, USA

    J. I. Berg

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  1. J. I. Berg
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Berg, J.I. Near infrared absorption coefficient of molten glass by emission spectroscopy. Int J Thermophys 2, 381–394 (1981). https://doi.org/10.1007/BF00498768

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  • DOI: https://doi.org/10.1007/BF00498768

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