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5-2 Emissivity
Emissivity is the ability of an object to emit or
absorb energy. Perfect emitters have an emissivity
of 1, emitting 100% of incident energy. An object
with an emissivity of 0.8 will absorb 80% and reflect
20% of the incident energy. Emissivity is defined as
ratio of the energy radiated by an object at given
temperature to the energy emitted by a perfect
radiator at the same temperature. All values of
emissivity fall between 0.1 and 1.0.
Non-contact temperature sensors measure IR energy
emitted by the target, have fast response, and are
commonly used to measure moving and intermittent
targets, targets in a vacuum, and targets that inaccessible
due to hostile environments, geometry limitations, or
safety hazard. The cost is relatively high, although in
some cases is comparable to contact devices.
6.Maintenance
Cleaning the lens: Blow off loose particles using
clean compressed air. Gently brush remaining
debris away with a camels hair brush. Carefully
wipe the surface with a moist cotton swab. The
swab may be moistened with water.
NOTE:
DO NOT use solvents to clean the lens.
Cleaning the housing:
Use soap and water on a damp sponge or soft cloth.
Broad Temp.
Infrared Thermometer
7
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