Table of Contents
Advertisement
3.2 Adjustments for Optimum Scan Results
Prior to a scan, the following adjustments and parameter settings should be considered for optimum scan
signals:
•
Lens focussing
•
Sensor alignment
•
Gain/Offset
•
Shading correction
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
To focus a line scan camera, the variations in edge steepness at dark/bright transitions and the modulation of the
line scan signal are desisive.
•
Adjust the focus using a fully opened aperture to restrict the depth of field and to amplify the effects of focus
adjustments.
•
A fully open aperture might cause a too high a signal amplitude, in which case the integration time should be
shortened, as described in Integration Time, p. 17.
Out of focus: edges are indistinct, signal peaks
blurred with low density modulation
14
SK7500GTO-XL Instruction Manual (11.2015)
3 Camera Control and Performing a Scan
•
Integration time
•
Synchronization of the sensor exposure and
the object surface velocity, trigger mode
options
Optimum focus: dark-bright transitions are
sharp edged, highly modulated signal peaks
with high frequency density variations
© 2015
Schäfter + Kirchhoff GmbH • Hamburg
Advertisement
Table of Contents
