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Proceedings Paper

The Infrared Emittance Of Semi-Transparent Materials Measured At Cold Temperatures
Author(s): S J Marshall
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Paper Abstract

The infrared emittance of semi-transparent glazing materials used in passive solar building construction was measured over the temperature range -5.6°C to +15°C at 2 - 5.6 μm wavelength. A table of measured apparent emittance values is presented. Absolute values of emittance are not provided due to the conclusion that no adequate model describing three-dimensional emittance in terms of thickness, rectilinear transmittance, and broadband detector sensitivity has yet been formulated. A rough rule-of-thumb for thermographers appears to be that a high emittance value can be assumed for most thick sheets of these materials but the emittance of thin films drops rapidly below a certain critical thickness.

Paper Details

Date Published: 27 March 1984
PDF: 5 pages
Proc. SPIE 0446, Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control, (27 March 1984); doi: 10.1117/12.939160
Show Author Affiliations
S J Marshall, U.S. Army Cold Regions Research and Engineering Laboratory (United States)

Published in SPIE Proceedings Vol. 0446:
Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control
Gordon J. Burrer, Editor(s)

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