optris PI160 Operator's Manual page 35

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Characteristic Emissivity
In case none of the methods mentioned above help to determine the emissivity you may use the emissivity
tables ►Appendix A and 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)
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