ALLIED Vision Technologies Oscar F-810 - Manual (Page 27)

AVT camera cleaning instructions
FireWire Hardware Installation Guide V8.0.0
27
Is it an impurity? – Identifying impurities
If you observe any image artefacts in your video preview of your AVT camera you
may have impurities either on the lens, filter/protection glass or, theoretically
on the sensor protection glass, although every AVT camera gets cleaned prior to
sealing and shipment.
Impurities (dust, particles or fluids) on the sensor or optical components ( Fig-
ure 2: Image with tiny dust on the filter (left) and dust on the sensor (right) on
page 27) will appear as a dark area, patch or spot on the image and will remain
fixed in the preview window while you rotate the camera over the target.
Do not confuse this with a pixel defect which will appear as a distinct point. It is
crucial to differentiate between dust (e.g. flakes of skin, particles) and other
dirt (e.g. liquids, fingerprints, grease). Particles can either rest loosely or can
be more or less stuck to the optical surface.
Where is the impurity? – Locating impurities
Before you dismount the lens you should find out if the impurity is on the filter,
lens or sensor. Therefore you should view a uniform image (e.g. a white sheet of
paper) with the camera. The affected optical surface is identified when a sus-
pected optical component is moved and the dirt follows this movement.
1. If you move only the lens (not the camera) and the impurity moves as
well, the impurity is on the lens.
2. If you move the IR cut filter/protection glass window and the impurity
moves as well:
Figure 2: Image with tiny dust on the filter (left) and dust on the sensor (right)