17.5 Changing object parameters
General
For accurate measurements, you must set the object parameters.
Types of
parameters
The camera can use these object parameters:
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.
Recommended
values
If you are unsure about the values, the following are recommended:
Atmospheric temperature +20°C (+69°F)
0.95Emissivity
1.0 m (3.3 ft.)Object distance
+20°C (+69°F)Reflected apparent temperature
50%Relative humidity
48 Publ. No. T559597 Rev. a554 – ENGLISH (EN) – September 27, 2011
17 – Working with measurement tools
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