optris CTlaser 05M, Operator'S Manual

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9.3 Characteristic emissivity
In case none of the methods mentioned above help to determine the emissivity you may use the emissivity
table
►
Appendix A and Appendix B . These are average values only. The actual emissivity of a material
depends on the following factors:

temperature

measuring angle

geometry of the surface

thickness of the material

constitution of the surface (polished, oxidized, rough, sandblast)

spectral range of the measurement

transmissivity (e.g. with thin films)