Operation and Features
BASLER L304
kc 3-19
Draft
Sensor-Conveyor Parallelism
The face of the sensor in the camera and the surface of the conveyor should be in parallel planes.
This condition should be met to ensure that all of the pixels in the sensor lines view the object at
the same magnification.
If the camera is positioned so that the sensor is rotated on its long axis as shown in Figure 3-17,
you will see haloing that is perpendicular to the transport direction. The color of the halo visible on
one side of the elements in the captured image will be the same as on the other side. For example,
lettering in the captured image may show green colored halos on both sides of each letter. The
haloing is less obvious on elements in the captured image that are closer to the center of the
image.
If the camera is positioned so that the sensor is rotated on its short axis as shown in Figure 3-18,
you will see haloing in the transport direction. The size and color of the halos in the captured image
will change as you move from the X position toward the Y position on the object as indicated in
the figure.
If your system design will not allow you to achieve sensor-conveyor parallelism, a telecentric lens
setup can be used to overcome the problems that this will cause. A telecentric setup usually
requires high illumination.
Figure 3-17: Sensor Rotated on its Long Axis
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