Changing Object Parameters - FLIR Exx series User Manual

15 – Working with measurement tools
15.4

Changing object parameters

General
For accurate measurements, you must set the object parameters.
Types of
The camera can use these object parameters:
parameters
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Recommended If you are unsure about the values, the following are recommended:
values
40
Emissivity, i.e., how much radiation an object emits, compared with the radiation
of a theoretical reference object of the same temperature (called a "blackbody").
The opposite of emissivity is reflectivity. The emissivity determines how much of
the radiation originates from the object as opposed to being reflected by it.
Reflected apparent temperature, which is used when compensating for the radi-
ation from the surroundings reflected by the object into the camera. This property
of the object is called reflectivity.
Object distance, i.e., the distance between the camera and the object of interest.
Atmospheric temperature, i.e., the temperature of the air between the camera
and the object of interest.
Relative humidity, i.e., the relative humidity of the air between the camera and
the object of interest.
External IR window compensation, i.e., the temperature of any protective windows,
etc., that are set up between the camera and the object of interest. If no protective
window or protective shield is used, this value is irrelevant and should be left in-
active.
Atmospheric temperature
Emissivity
Object distance
Reflected apparent temperature
Relative humidity
+20°C (+69°F)
0.95
1.0 m (3.3 ft.)
+20°C (+69°F)
50%
Publ. No. T559597 Rev. a500 – ENGLISH (EN) – December 10, 2010