C5 Series User Manual Rev. 1.4
29
The Center Of Gravity Mode (COG)
In this mode the center of gravity of laser beam profile is calculated. For this purpose the
following parameters are computed:
Position value of the left edge of laser beam profile for a given intensity threshold value
P
L
,
Sum of intensity value I
s
= ∑ I
p
,
Sum of first order moment M
s
= ∑I
p
* P .
The position value of laser line (center of gravity of beam profile) is then obtained from:
P
COG
= P
L
+ M
s
/ I
s
.
In addition the laser line width can be delivered over the Data Channel DC1. The average
intensity of the illumination profile can be calculated by normalising the sum of intensity
value I
s
with the line width.
The precision of the COG calculation can be improved by enabling the smoothing mode
of the FIR filter of the camera.