ELiiXA® UC8/UC4
15
Eliixa_Color–revF 04/11
e2v semiconductors SAS 2011
5
SETTING UP THE CAMERA IN THE SYSTEM
Vocabulary:
w
= size of the sensor line (40,96mm)
FOV
= Field Of View (width of the web inspected by the sensor line) in mm.
L
= Working distance (from the Lens to the Web) in mm.
f
= focal distance of the lens in mm.
S
= Speed of the web in mm/s
We have:
w/FOV = f/L
The ratio M = w/FOV is called Magnification.
The FOV is grabbed by 4096 pixels in the width.
In order to get a ratio of 1 :1 in your image, at the web speed of S, your line rate has to be set:
Line Rate = (S/FOV) x 4096
Ex: if the FOV = 11 cm (110mm) and the speed of the web is S= 0,3 m/s (300mm/s) the line rate will be:
Line Rate = (300 /110) x 4096 = 11170 Lines/s.
The spatial correction has to be set to 2 because the spacing between two color lines in the sensor is
20µm center to center (2 lines of 10µm width).
If you use a 60mm lens, the working distance will be: L = (60 x 110) 40,96 = 161mm.
This will certainly require a macro lens.
