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7. Difficulties in measuring emissivity
This section deals only with measurements on opaque materials.
7.1 Direct methods for measuring radiation emitted by the material
7.1.1 Measurement of spectral directional emissivity or total directional emissivity
This measurement is made by direct comparison of the radiation produced by the material with the radiation produced by a reference source; the measurement technique is directly based on one of the definitions given by the relationships
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Difficulties in measuring emissivity
Uncertainties in emissivity measurements
Bibliography
Norms and Standards
- Glass in construction – Determination of emissivity - NF EN 12898 - 2001
- Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques, ASTM International, West Conshohocken, PA - ASTM E408-13 - 2013
- Standard Test Method for Total Hemispherical Emittance of Surfaces up to 1 400 °C, ASTM International, West Conshohocken, PA - ASTM C835-06 - 2006
- Standard Test Method...
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