Internal Shutter Problems - Teledyne FLIR A68 Series User Manual

Internal Shutter Problems

The A68/A38 internal shutter is a small mechanical device that when activated to
change position requires a certain amount of electical power above the nominal
operating level. In some cases, if inadequate power is available the transition from
open to closed state may be interrupted. As a preventative measure to avoid electrical
faults ensure that the camera is adequately powered according to the
Interface specifications.
Other issues due to the mechanical nature of the shutter may also be at fault,
however, the camera is tolerant to a certain level of shock and vibration (refer to the
A68/A38 Series EMI, Shock and Vibration Certifications
The shutter movement from the open to closed position is as follows:
Open
shutter
To analyze the shutter position during FPN correction, the average non-uniformity is
calculated over 3 zones in the image. The Last FPN Average Error features, available in
the FPN Correction
Zone A, the full image, is used to detect a halfway-stuck shutter (near 45 degree
angle). Zone B, a 100-pixel wide section in the top-left corner, detects a barely open
shutter. Zone C, a 100-pixel height section in the bottom-right corner, detects a nearly
closed shutter. Higher than normal values in these zones indicate a shutter problem
has occurred.
166 • Troubleshooting
category, display results immediately following an FPN correction.
).
Closed
shutter
FLIR A68/A38 Series IR Camera User's Manual
Electrical