Sch"after+Kirchhoff SK1024U3PD Manuel d'instructions télécharger pdf (Page 10)

Page 10

3. Camera Control 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

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. 13.

Out of focus: edges are indistinct, signal

peaks blurred with low density modulation

Optimum focus: dark-bright transitions are

sharp edged, highly modulated signal

peaks with high frequency density

variations

3. Camera Control and Performing a Scan

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Sch"after+Kirchhoff SK1024U3PD Manuel d'instructions Page 10