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15 Mechanical Considerations
15.2 Adjusting the Back Focus
The back focus of your Photonfocus camera is correctly adjusted in the production of the
camera.
This section describes the procedure to adjust the back focus if you require that because e.g.
you are using a special lens.
1.
Screw a lens strongly into the camera's C-mount ring.
2.
Unscrew the 2 small screws that lock the C-mount ring with a hex-wrench of size 1.27 mm.
The position of the screws is shown in Fig. 15.15. The ring can now be screwn upwards or
downwards by turning the lens.
3.
To adjust the back focus fully open the aperture of the lens and set the focus to infinite.
4.
Start the image acquisition and point the camera to a straight edge/line in a distance x (x
= infinite distance of your lens) from the camera, e.g. a door frame.
5.
Screw the ring upwards or downwards until the straight edge/line (distance: infinite) is
also straight on the camera image.
6.
Tighten the small screws. As the ring is locked, the lens can now be easily removed.
Figure 15.15: Position of the 2 small screws that lock C-mount.ring
15.3 Optical Interface
15.3.1 Cleaning the Sensor
The sensor is part of the optical path and should be handled like other optical components:
with extreme care.
Dust can obscure pixels, producing dark patches in the images captured. Dust is most visible
when the illumination is collimated. Dark patches caused by dust or dirt shift position as the
angle of illumination changes. Dust is normally not visible when the sensor is positioned at the
exit port of an integrating sphere, where the illumination is diffuse.
1.
The camera should only be cleaned in ESD-safe areas by ESD-trained personnel using wrist
straps. Ideally, the sensor should be cleaned in a clean environment. Otherwise, in dusty
environments, the sensor will immediately become dirty again after cleaning.
2.
Use a high quality, low pressure air duster (e.g. Electrolube EAD400D, pure compressed
inert gas, www.electrolube.com) to blow off loose particles. This step alone is usually
sufficient to clean the sensor of the most common contaminants.
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MAN085 04/2021 V1.3
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Troubleshooting
