Changing Object Parameters; General; Types Of Parameters; Recommended Values - FLIR GFx320 User Manual

16 Achieving a good image
4. Move the joystick up/down to go to select Invert palette.
5. Push the joystick to enable/disable the setting.
6. Push the button to leave the setup mode.

16.8 Changing object parameters

16.8.1 General

For accurate measurements, you must set the object parameters. You can do this locally
or globally. This procedure describes how to change the object parameters globally.

16.8.2 Types of parameters

The camera can use these object parameters:
• Emissivity, i.e., how much radiation an object emits, compared to the radiation of a
theoretical reference object of the same temperature (called a "blackbody"). The op-
posite 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 radiation
from the surroundings reflected by the object into the camera. This property of the ob-
ject 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 ob-
ject 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 windows,
etc. that are set up between the camera and the object of interest.

16.8.3 Recommended values

If you are unsure about the values, the following values are recommended:
Emissivity 0.95
Distance 1.0 m (3.3 ft.)
Reflected appa- +20°C (+69°F)
rent temperature
Relative humidity 50%
Atmospheric +20°C (+69°F)
temperature

16.8.4 Procedure

Follow this procedure to change the object parameters globally:
1. Turn the mode wheel to
2. Push the button to display a menu.
3. Move the joystick left/right to go to the Edit tab.
4. Move the joystick up/down to select Object parameters.
5. Push the joystick to display a dialog box.
6. Move the joystick up/down to select the parameter you want to change, then push
the joystick.
7. Move the joystick up/down to change the value, then push the joystick.
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