Loading ...
Loading ...
Loading ...
Performance Series Thermal Imagers
Temperature Measurement
21
Temperature Measurement
All objects radiate infrared energy. The quantity of energy radiated is based on
the actual surface temperature and the surface emissivity of the object. The
Imager senses the infrared energy from the surface of the object and uses this
data to calculate an estimated temperature value. Many common objects and
materials such as painted metal, wood, water, skin, and cloth are very good at
radiating energy and it is easy to get relatively accurate measurements. For
surfaces that are good at radiating energy (high emissivity), the emissivity
factor is ≥90 % (or 0.90). This approach does not work on shiny surfaces or
unpainted metals as they have an emissivity of <0.60. These materials are not
good at radiating energy and are classified as low emissivity. To more
accurately measure materials with a low emissivity, an emissivity correction is
necessary. Adjustment to the emissivity setting will usually allow the Imager to
calculate a more accurate estimate of the actual temperature.
Warning
To prevent personal injury, see emissivity information for actual
temperatures. Reflective objects result in lower than actual
temperature measurements. These objects pose a burn hazard.
Note
Surfaces with an emissivity <0.60 make reliable and consistent
determination of actual temperatures problematic. The lower the
emissivity, the more potential error is associated with the Imager's
temperature measurement calculations, even when emissivity and
reflected background adjustments are attempted and performed
properly.
More information is available on emissivity at http://www.fluke.com/emissivity
and http://www.fluke.com/emissivityexplanation. We recommend the study of
this topic to get the most accurate temperature measurements.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
Loading ...
Loading ...
Loading ...