Example: lens calculation
This example is based on a 1/2" sensor chip, such as the Basler Scout 1390-17gm.
• The FOV should cover a conveyor belt with a width of 500 mm.
• The minimum height of the FOV is not restricted.
• The distance between the camera and the conveyor is 800 mm.
• The camera is mounted with the belly facing the robot (PickMaster default).
Because the width of the conveyor determines the minimum FOV the required
focal length is calculated using:
f = (D/W)*Cw
Enter the known data, C
w
is 6.4mm (see graphic above).
f = (800/500)*6.4 = 10.24 mm
The resulting height H of the FOV is calculated as:
H = D*CH/f = 800*4.8/10.24 = 375 mm
Alternative with increased height
To increase the height of the FOV (H), the camera can be rotated 90° so that the
height dimension of the sensor chip (4.8 mm) is aligned with the width dimension
of the conveyor. The width dimension (6.4 mm) is aligned with the x-axis of the
conveyor.
f = (800/500)*4.8 = 7.68 mm
The resulting height H of the FOV is now:
H = 800*6.4/7.68 = 666 mm
Normally lenses are available in some standard focal lengths. Choose a lens that
has a focal length shorter than the calculated value to be sure to capture the entire
scene.
24 Application manual - PickMaster® Twin - PowerPac
3HAC064218-001 Revision: B
© Copyright 2021 ABB. All rights reserved.
2 Installation
2.2.4 Camera requirements
Continued
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