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Flir T1020 Manual

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Working with measurement tools17
Follow this procedure:
1. To select the measurement tool, touch the tool on the screen. The tool is now dis-
played with one or more handles.
Spot measurement tool:
Area measurement tool:
2. Push the joystick—or touch and hold the tool. This displays a context menu.
• Select
(Resize) to change the size of the tool.
• Select
(Move) to move the tool.
3. Move the joystick up/down and left/right to resize or move the tool.
4. When completed, push the joystick and select
(Done).
17.5 Changing object parameters
17.5.1 General
For accurate measurements, you must set the object parameters.
17.5.2 Types of parameters
The camera can use these object 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.
• 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
(Settings) > Device settings > User interface
options > Emissivity mode > Select from materials table.
Of the object parameters, Emissivity is the most important 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
#T559954; r. AL/37426/37426; en-US
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