Fluke Ti20 User Manual download pdf (Page 61)

C-1

Appendix C

Typical Emissivity Values

The following tables provide references for estimating emissivity and can be used when

the user does not have the means or the time to determine the emissivity value

experimentally. Emissivity values shown in the tables are only approximate. Any or all of

the following parameters can affect the emissivity of an object:

• Temperature

• Angle of measurement

• Geometry (plane, concave, convex, etc.)

• Thickness

• Surface quality (polished, rough, oxidized, sandblasted)

• Spectral region of measurement

• Transmissivity (i.e., thin film plastics)

Note

These following tables are to be used as a guide only, as emissivity changes

with temperature, viewing angle, wavelength, target geometry and surface

finish.

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Fluke Ti20 User Manual Page 61