Schäfter+Kirchhoff SK12240U3KOC-LB, Instruction Manual, Page: 12 / 34

Camera Control and Performing a Scan
Instruction Manual
SK12240U3KOC-LB
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Instruction Manual SK12240U3KOC-LB © 2020-03 E
Camera Contr
ol and Performing a Scan
3.2 Adjustments for Optimum Scan Results
• Lens focussing
•
Sensor alignment
• Gain/Offset
• Shading correction
• Integration time
• Synchronization of the sensor exposure
and the object surface velocity, trigger
mode options.
Prior to a scan, the following adjustments and parameter settings should be considered for optimum
scan signals:
Start with the signal window / oscilloscope display. Any changes in the optical system or camera
parameters are displayed in real-time when using an open dialog box.
„
Lens Focussing
The real time Signal Window facilitates the effective focussing of the line scan camera system, even for
two-dimensional measurement tasks. For determining the correct focus, the edge steepness at dark-bright transi-
tions and the modulation of the line scan signal are the most important factors.
Adjust the focus with the aperture fully open to limit the depth of field and enhance the effects of changing the
working distance.
If the sensor is overloaded when the aperture is fully open, the easiest way to reduce the signal amplitude is to
shorten the integration time, as described in section
Optimum brightness adjustment, Integration Time (p.
17) .
Out-of-focus:
• Low edge steepness
• Signal peaks are blurred
• High spatial frequencies with low modulation depth
Optimum focus:
• Dark-bright transitions with steep edges
• Large modulation in the signal peaks
• High spatial frequencies with high modulation depth
steep edges
high modulation
depth
low modulation depth
low edge steepness