Types Of Parameters; Recommended Values; Procedure - FLIR E53 User Manual

16 Working with measurement tools
Note During normal operation there is typically no need to change the default measure-
ment parameters, see section 16.5.3 Recommended values, page 78.

16.5.2 Types of parameters

The camera can use these measurement parameters:
• External IR window compensation, i.e., the temperature of any protective windows, ex-
ternal lenses (e.g., the close-up lens), etc., that are set up between the camera and the
object of interest. If no protective window, protective shield, or external lens is used, this
value is irrelevant and should be left inactive.
• Object distance, i.e., the distance between the camera and the object of interest.
Note The camera can be configured to automatically measure the distance when an
image is saved. With this setting, the Object distance parameter in the image data is
automatically updated with the measured distance when an image is saved. (There is
no effect on the Object distance setting in live mode.) For more information, see section
, page .
• 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 ob-
ject of interest.
• Reflected temperature, which is used when compensating for the radiation from the
surroundings reflected by the object into the camera. This property of the object is
called "reflectivity."
• Emissivity, i.e., how much radiation an object emits, compared with the radiation of a
theoretical reference object at the same temperature (called a "blackbody"). The oppo-
site of emissivity is reflectivity. The emissivity determines how much of the radiation
originates from the object as opposed to being reflected by it.
Note There is an Emissivity mode setting, which you can use to enter the emissivity
by material instead of by value. Select
options > Emissivity mode > Select from materials table.
Emissivity is the most important measurement parameter to set correctly. If the Emissivity
is set to a low value, the Reflected temperature also becomes important. The parameters
Object distance, Atmospheric temperature, and Relative humidity are relevant for longer
distances. The External IR window compensation must be activated if a protective window
or external lens is used.

16.5.3 Recommended values

If you are unsure about the values, the following are recommended:
Object distance
Atmospheric temperature
Relative humidity
Reflected temperature
Emissivity

16.5.4 Procedure

You can set the measurement parameters globally. You can also change the Emissivity,
Reflected temperature, and Object distance parameters locally for a measurement tool.
#T810190; r. AL/47698/47698; en-US
(Settings) > Device settings > User interface
1.0 m (3.3 ft.)
20°C (69°F)
50%
20°C (69°F)
0.95
78