Performing Manual Fpn Correction With External Shutter; Figure 6: Performing Fpn Correction - Teledyne FLIR A68 Series User Manual

For information on troubleshooting the internal mechanical shutter, refer to the
Internal Shutter Problems section.

Performing Manual FPN Correction with External Shutter

4. With the camera at nominal operating temperature, expose the camera (with the
lens) to a scene of uniform temperature. For example, this can be done using an
object with a flat surface, ideally matte black and non-reflective, such as a metal
plate. This flat surface must not be in direct contact with the camera lens to
avoid heat transfer or reflection; leave a small gap between the surface and the
lens so they do not touch.
Note: When using an external shutter, if a scene of uniform temperature
is not used for FPN correction, resulting images will have artifacts.
The following images demonstrate the effect of a faulty FPN correction due to the use
of a non-uniform scene.
40 • Features and Configuration Options
Flat surface with uniform temperature
Gap from
lens

Figure 6: Performing FPN Correction

FLIR A68/A38 Series IR Camera User's Manual