The Infrared Emittance Of Semi-Transparent Materials Measured At Cold Temperatures

S J Marshall

doi:10.1117/12.939160

27 March 1984 The Infrared Emittance Of Semi-Transparent Materials Measured At Cold Temperatures

S J Marshall

Proceedings Volume 0446, Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control; (1984) https://doi.org/10.1117/12.939160
Event: Thermal Infrared Sensing for Diagnostics and Control: Thermosense VI, 1983, Oak Brook, United States

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.

Citation Download Citation

S J Marshall "The Infrared Emittance Of Semi-Transparent Materials Measured At Cold Temperatures", Proc. SPIE 0446, Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control, (27 March 1984); https://doi.org/10.1117/12.939160

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