AVIIVA® EM1
18
1043D - AVIIVA EM1 –04/11
e2v semiconductors SAS 2011
5.2
Setting up in the system
Vocabulary :
w
= size of the sensor line (40,96mm for the 4k 10µm)
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 or 2048 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 (or 2048)
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.
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.
FOV
Focal Plan
CCD Plan
f
L
w
s
w
f
FOV
L
=
