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OPEARTING MANUAL
Technische Änderungen vorbehalten
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CAUTION: On all three methods the object temperature must be different from ambient temperature.
9.3
Characteristic Emissivity
In case none of the methods mentioned above help to determine the emissivity you may use the emissivity tables
►Appendix A
– Table of
Emissivity for metals
and
Appendix B – Table of Emissivity for non-metals
. 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))