Line Scan Camera SK6288GKOC-L Manual (06.2015) • shar
ed_CameraContr
ol(3)_Sync_GigE_ML.indd (06.2015)
19
3 Camera Control and Performing a Scan
SK6288GKOC-L
Instruction Manual
(06.2015)
© 2015
Schäfter + Kirchhoff GmbH
•
Hamburg
The optimum object scan velocity is calculated from:
W
P
· f
L
V
O
=
ß
If the velocity of the object carrier is not adjustable
then the line frequency of the camera must be adjusted
to provide an image with the correct aspect ratio,
where:
V
O
· ß
f
L
=
W
P
V
O
=
object scan velocity
W
P
=
pixel width
f
L
=
line frequency
S
=
sensor length
FOV
=
field of view
ß
= magnification
=
S / FOV
Synchronization of the Imaging Procedure and the Object Scan Velocity
• A two-dimensional image is generated by moving either the object or the camera. The direction of the translation
movement must be orthogonal to the sensor axis of the CCD line scan camera.
• To obtain a proportional image with the correct aspect ratio, a
line synchronous transport
with the laterally
correct pixel assignment is required. The line frequency and the constant object velocity have to be adapted to
each other.
• In cases of a variable object velocity or for particular high accuracy requirements then an
external synchroni-
zation
is necessary. The various
trigger modes
are described below.
Example 1:
Calculating the object scan velocity for a given field of view and line frequency:
Pixel width
= 14 µm
Line frequency
= 9.28
kHz
S
=
29.3 mm
FOV
=
50 mm
14 µm
·
9.28
kHz
V
O
=
(29.3 mm / 50 mm)
=
222 mm/s
Example 2:
Calculating the line frequency for a given field of view and object scan velocity:
Pixel width
= 14 µm
Object scan velocity
=
200 mm/s
S
=
29.3 mm
FOV
=
50 mm
200 mm/s
·
(29.3 mm / 50 mm)
f
L
=
14 µm
=
8.4
kHz
3 Camera Contr
ol and Performing a Scan
FOV
S
V
0
Pixel #1
Pixel #1
W
P
/ ß
CCD Sensor
Scan Object
