Page 31
User Guide
LSP Ex System for Zone 22
Linescanner Head
Product movement
Sc
an
lin
e
Skew angle
q
q
q
Example 1
- A greater skew angle is
created when high product speeds are
combined with low scan frequencies.
Note:
During product width calcula-
tions, the apparent width is displayed
greater than the actual width.
Example 2
- When high product
speeds are combined with medium scan
frequencies, the skew angle is reduced
when compared to Example 1.
Example 3
- When high product speeds
are combined with high scan frequen-
cies, the skew angle is negligible when
compared to Example 1.
The scan skew angle is given by:
(
)
=
=
−
−
speed
scan
speed
product
Tan
frequency
scan
2
speed
product
Tan
1
1
D
π
q
e.g. At a scan frequency of 50Hz, a target distance (D) of 2m and product speed
of 10m/s .........
q
= 0.91°
Apparent (measured) product width = actual product width
(ignoring edge correction errors)
Cos
q
