Dalsa 1M30, User'S Manual And Reference

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Pantera 1M60 and 1M30 User’s Manual 23
DALSA 03-032-10033-09
Example 2: Frame Rate is set by External Trigger Pulses.
FT
CR
Exposure Time
Readout
Exposure Time
FT
CR
Readout
Frame Period
Frame Period
Ignor ed
Trigger
Trigger Trigger
Mode 4: Smart EXSYNC, External Frame Rate and Exposure Time
In this mode, the external trigger rate sets both the frame rate and the exposure time. The
rising pulse of the external trigger marks the beginning of the exposure and the falling
edge ends the exposure and initiates frame transfer. During frame transfer, 1030 lines of
data are transferred down from the image area to the storage area of the sensor (see
Figure 1: FTT 1010-M Image Sensor for sensor architecture). After the frame transfer had
completed, one more line is transferred down and the charge reset occurs, initiating
readout.
Restrictions:
•
At the end of the exposure time, the collected data will be transferred to the readout
area only if it is not already in the process of reading out. If readout is already in
process, the exposure time will be extended until the readout is finished
•
If the rising edge of the exsync signal occurs during the frame transfer stage, the
pulse is moved to the end of the frame transfer.
Example 3: Trigger Period is Repetitive and Greater than Read Out Time.
Exposure Time FT
External Trigger
CR Readout FT
5 μ s
Example 4: Trigger Period is Intermittent and Occasionally Shorter than Read Out Time.
FT CR
Readout
Exposure Time
Rising exsync pulse
is moved to end of
transfer stage Ignored
falling
exsync
pulse
Readout FT CR
Ignored
rising
exsync
pulse
Falling exsync pulse
is moved to end of
readout stage
Exposure time is extended
to correspond with readout
and ignores the falling
exsync pulse
Exposure Time
FT = Frame Transfer
Time
CR= Charge Reset