Thermal imaging basics
7
7.1 Focus
It is very important to adjust the focus correctly. If the camera is out of focus, there is risk
of missing a gas leak. Incorrect focus adjustment also affects the temperature
measurements.
Figure 7.1 In the unfocused image (left), you can only see a diffuse hotter area. The focused image (right)
clearly shows which object is being observed and where the object is warm.
A focused and sharp image makes the object and heat pattern easy to recognize. A
blurred image not only makes it harder to identify the object and any faults, but can also
lead to measurement errors which are more serious the smaller the measurement object.
Even if all other parameters are set correctly, the measurement values from an unfo-
cused thermal image are highly likely to be incorrect.
Figure 7.2 The measured temperature is higher in the focused image than in the unfocused image.
7.1.1 Adjust focus
You can adjust the focus manually by using the focus ring, or autofocus by pushing the
center of the Focus/Zoom button. See also section 6.8 Focus.
Note Applicable to the FLIR Gx models: You can only adjust the focus manually by us-
ing the focus ring.
7.2 Temperature range
The camera is calibrated for different temperature ranges. The available temperature
range options depend on the camera model.
The temperature range setting has an impact on the sensitivity of the camera and on the
integration (exposure) time. What temperature range to select depends on the thermal
conditions in the scene.
#T810605; r. AD/92464/92464; en-US
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