11 September 1989 Transient Temperature Technique For Measuring Normal Spectral And Normal Total Emittance
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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.
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Robert J. Tiernan, James E. Saunders, "Transient Temperature Technique For Measuring Normal Spectral And Normal Total Emittance", Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); doi: 10.1117/12.960782; https://doi.org/10.1117/12.960782
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