SICK Ranger E

Chapter 5 Reference Manual
Ranger E/D
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Configuring Ranger E and D
Figure 5.7 (continued)– Exposure times and cycle times in different combinations of
reset and trig modes. Note that the cycle time is longer for the
same exposure time when using the explicit reset than when no
reset is used.
In fact, the Ranger uses a rolling shutter sensor – that is, it reads out and resets the
exposure on the sensor one row at a time. Therefore, the exposure of the first row on the
sensor will start at the beginning of the cycle, while the exposure of the last row will start at
the end of the reset period. The length of the exposure time for a sensor row is independ-
ent of the location of that row, since the readout is made in the same way as the resetting.
In most cases, the difference in when the exposure is started has very little effect upon the
accuracy of the measurement results – much smaller than for example object properties
and factors in the environment.
Figure 5.8 - Rolling shutter.
Cycle time
Reset
Read-out
Exposure time
Sensor
row
Free
-
running with explicit reset
Pulse triggering with explicit reset
Exposure time Reset
Exposure time Reset
Cycle Cycle
Cycle Cycle
Tri
g
Tri
g
Cycle time
Min. cycle time
Time
Time
F
i
x
ed idle time
Variable idle time