User Manual
Ashley-Edison International Ltd
Page 44
This is done by setting the emissivity control to the appropriate value. It is therefore
necessary to know the value of the emissivity. There is a vast amount of data
available, unfortunately much of it is confusing because substantially different
values are quoted. This is because emissivity depends upon:
a) The basic material
b) Surface condition - roughness and oxidation
c) Temperature
d) Angle of view
e) Wavelength
For materials with smooth, clean (unoxidised) surfaces, emissivities are usually
in the range 0.05 to 0.50 and are usually very wavelength dependent, being
higher at shorter wavelengths. The appropriate settings for the
Model M2
IR
Thermal Cameras are given in the following tables. It must be remembered that
these are only guideline figures. They can be substantially increased if the surface
is rough or even slightly oxidised.
The values quoted for oxidised metals assume that the metal is heavily oxidised.
Thin oxide layers will give an emissivity value between this and the value for an
unoxidised surface
The values quoted for oxidised metals assume that the metal is heavily oxidised.
Thin oxide layers will give an emissivity value between this and the value for an
unoxidised surface
If a more precise emissivity value is needed or more information is required on
how to obtain the emissivity value of a specific material, please contact us:
