Basler L304kc User Manual page 56

Operation and Features
Example 1
Assume the following conditions:
• Conveyor movement per line capture = 0.25 mm
• Desired aspect ratio = 1/1
• Conveyor Width = 850 mm
• Length of Sensor Line = 40.80 mm (4080 pixels/line x 10 µm/pixel)
With an objective lens in place
•
cross the blue line in the sensor first.
Step 1 - Check Table 3-3 and note that for a 1/1 aspect ratio, n must be set to 9.
Step 2 - Calculate the magnification:
90 µm
β
--------------- -
=
× y
n
β
-------------------------------- -
=
×
9
β = 0.04
(β
is the standard symbol for magnification.
ratio would be or 1 : 25.0 or 1 / 0.04. You should also note that this ratio is frequently shown
with a minus sign.)
Step 3 - Calculate the line of view of the sensor
L = 40.80 mm
L = 40.80 mm
L = 1020.0 mm
Step 4 - Select an appropriate lens and determine the mounting distance for your camera. You
can contact Basler Technical Support if you need help with this procedure.
Step 5 - Make sure that the Spatial Correction Direction and the Spatial Correction Amount
parameters (see Section 3.5.2) are set correctly. In this example, the direction would be
set to blue and the amount to 9.
Step 6 - Capture images
3-22
∆
90 µm
0.25 mm
1
×
-- -
β
1
×
---------- -
0.04
Draft
, the direction of travel of the object will cause the image to
β
is often expressed as a ratio. In this case, the
kc
BASLER L304