Illumination of the surface of an object does not change its
emissivity, although for high accuracy IRT, ambient illumination
must be taken into account. Solar radiation reaching the earth includes
mainly visible radiation. When cattle are exposed to solar
radiation some portion of the visible radiation may be absorbed
and re-emitted as heat, or IR radiation. Since the visible radiation
is color dependent, blacker cattle should absorb more solar radiation,
and solar loading effects will be greater, when measuring IR
temperatures.
 
Illumination of the surface of an object does not change its
emissivity, although for high accuracy IRT, ambient illumination
must be taken into account. Solar radiation reaching the earth includes
mainly visible radiation. When cattle are exposed to solar
radiation some portion of the visible radiation may be absorbed
and re-emitted as heat, or IR radiation. Since the visible radiation
is color dependent, blacker cattle should absorb more solar radiation,
and solar loading effects will be greater, when measuring IR
temperatures.
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