C2 Series User Manual Rev. 1.9
21
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.
AO I_TRSH
P
CO G
P
L
I
S
