optris LS – E2006-01-A
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► Cove a part of the surface of the measuring object with black, flat paint with an emissivity of 0,98. Adjust the
emissivity of your infrared thermometer to 0,98 and take the temperature of the colored surface. Afterwards,
determine the temperature of a directly adjacent area and modify the emissivity until the measured value
corresponds to the temperature of the colored surface.
Characteristic Emissivities
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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