19.9 Changing object parameters
General
For accurate measurements, you must set the object parameters. This procedure
describes how to change the parameters.
Types of
parameters
The camera can use these object parameters:
Emissivity, which 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 optics temperature, 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.
■
External optics transmission, i.e., the optical transmission of any protective win-
dows, etc. that are set up between the camera and the object of interest.
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
96 Publ. No. 1558792 Rev. a460 – ENGLISH (EN) – July 1, 2010
19 – Working with measurement tools and isotherms
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