Emissivity
0.95 and take the temperature of the sticker. Afterwards, determine the temperature of the adjacent area
on the measuring object and adjust the emissivity according to the value of the temperature of the
sticker.
►
Cove a part of the surface of the measuring object with a 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.
CAUTION:
On all three methods the object temperature must be different from ambient temperature.
8.3
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 (plane, 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)
thermoMETER CSmicro
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