The graphic below shows the geometry of the optical setup.
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Sensor chipA
LensB
Chip height (mm)C
Chip width (mm)C
Distance from lens to scene (mm)D
SceneE
Focal length of camera (mm)f
Scene height (mm)H
Scene width (mm)W
To select a suitable lens, measure the distance between the camera and the items
(D), and the size of the image area (W*H).
To calculate the appropriate focal length of the lens:
• If the height of the image area is most important: f = (D/W)*Cw
• If the length of the image area is most important: f = (D/H)*Ch
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The table below lists the width and height of some common sensor chip sizes,
expressed in millimeters.
C
w
(mm)C
h
(mm)Sensor chip size (inch)
3.22.41/4"
4.83.61/3"
6.44.81/2"
8.86.62/3"
A shorter focal length gives a wider field of view, that is the returned value is the
maximum focal length to obtain the specified W and H.
Continues on next page
Application manual - PickMaster® Twin - PowerPac 23
3HAC064218-001 Revision: B
© Copyright 2021 ABB. All rights reserved.
2 Installation
2.2.4 Camera requirements
Continued
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