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Proceedings Paper

Transient Temperature Technique For Measuring Normal Spectral And Normal Total Emittance
Author(s): Robert J. Tiernan; James E. Saunders
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Paper Abstract

Normal spectral and normal total emittance values were obtained for sapphire and translucent alumina using Fourier-transform infrared spectroscopy. Values were derived from radiance measurements in the spectral range of 5000 cm-1 to 400 cm-1, and in the temperature range of 900 K to 1450 K. Samples were dropped from a furnace into the nitrogen ambient of the spectrometer to the position where the internal globar source is normally focused. Temperatures were determined from radiance values at 1027 cm-1 where alumina has zero reflectivity and transmittance. Standard deviations of the total normal emittances, expressed as percentages of the average of three drops, were ≤3% of the averages.

Paper Details

Date Published: 11 September 1989
PDF: 10 pages
Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); doi: 10.1117/12.960782
Show Author Affiliations
Robert J. Tiernan, GTE Electric Products (United States)
James E. Saunders, GTE Electric Products (United States)


Published in SPIE Proceedings Vol. 1112:
Window and Dome Technologies and Materials
Paul Klocek, Editor(s)

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