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Thermal Imagers
Setting Emissivity
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measurement on materials with a low emissivity, an emissivity correction is
often necessary. The easiest correction method is to set the Imager to the
proper emissivity value so the Imager automatically calculates a corrected
surface temperature. If the Imager uses a fixed emissivity value (meaning that
it is set to one value and the user cannot adjust it), then the Imager’s
measurement must be multiplied by a value found in a look up table to get a
more accurate estimate of the actual temperature.
Regardless of an Imager’s ability to adjust for emissivity in calculating
temperature measurements, surfaces with an emissivity of 0.60, or lower, are
often difficult to obtain truly accurate temperature measurements without
significant error. It is always best to change or improve the emissivity of a
surface when possible if accurate temperature measurements are required.
The Imager has the ability to set emissivity by directly entering a value or
using a table of built-in values. Much information is available on emissivity.
Further study of this topic is recommended to get the most accurate
temperature measurements using the Imager.
Note
All thermal imagers require appropriate warm-up time in order to
obtain the most accurate temperature measurement and best image
quality. This time can often vary by model and by environmental
conditions. Although most imagers are fully warmed-up within 3-5
minutes, it is always a best practice to wait at least 10 minutes if the
most accurate temperature measurement is critical to your
application. Whenever changing or adding optional lenses, additional
stabilization time may be required depending on the situation.
Setting Emissivity
Setting your Imager with correct emissivity values is critical to making
accurate temperature measurements. To set the emissivity value:
1. Press until Emissivity appears over .
2. Press the softkey labeled Emissivity.
At this point, emissivity can be set directly as a value or selected from a list of
emissivity values for some common materials. To select from a list of common
materials:
1. Press the softkey labeled Table.
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