Fluke Ti450 User Manual - Page 29

Temperature Measurement, Menus

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Thermal Imagers Temperature Measurement 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 simplification does not work well on shiny surfaces or unpainted metals as they have an emissivity of

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Thermal Imagers
Temperature Measurement
25
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 simplification does not work well 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.
W
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.
Menus
The menus, together with the three function buttons (
,
,
) and
arrow buttons, are access for thermal image display, camera features, memory
setup, and settings for date, time, language, units, file format, and Imager
information.