14.3 Characteristic Emissivity
In the case that none of the methods mentioned above help to determine the emissivity you may use the
emissivity tables, see Chap. A 2, see Chap. A 3. These are only average values. The actual emissivity of a ma-
terial depends on the following factors:
- Temperature
- Measuring angle
- Geometry of the surface (smooth, convex, concave)
- Thickness of the material
- Constitution of the surface (polished, oxidized, rough, sandblast)
- Spectral range of the measurement
- Transmissivity (e.g. with thin films)
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