BOBCAT Hardware User’s Manual
Imperx, Inc.
Rev. 1.0
6421 Congress Ave.
5/4/2010
Boca Raton, FL 33487
+1 (561) 989-0006
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TRIGGER
EXPOSURE
DATA
SHUTTER
DATA 1
DATA 2
Exp 1
Exposure 2
EVENTS
1
2
STROBE
Only if the main strobe is enabled
Only if the trigger strobe is enabled
Figure 2.16 – Double exposure triggering
CAUTION NOTE
The Vertical Frame Transfer period is the time required for all pixel charges to be
transferred under the vertical registers after the frame exposure ends. This finite
time imposes some restrictions for minimum exposure duration in standard and
double triggering modes. The minimum exposure period is camera dependent as
shown below:
B0610 and B0620 – minimum exposure is 2 us,
B1410 and B1610 – minimum exposure is 4 us,
B2520 – minimum exposure is 8 us.
B1620, B1920 and B2020 – minimum exposure is 11 us,
B4020 and B4820 – minimum exposure is 15 us.
D.
Frame Accumulation Triggering
When the Frame Accumulation triggering mode is enabled, the camera idles and
waits for a trigger signal. Upon receiving the external trigger signal, the camera
clears the horizontal and vertical registers, sends a shutter pulse to clear the pixels
and starts integration – Figure 2.17. Upon receiving the trigger signal the camera
starts integration for the first frame, completes the integration, transfers the
information to the vertical registers and then waits for the next trigger. Upon
receiving the next trigger signal the camera starts integration for the next frame,
completes the integration, transfers the information to the vertical registers and then
waits for the next trigger. The number of triggers used is set by the “Pulses per
Capture” register. After the last trigger has been received the information is being
read out. This completes the current trigger cycle and the camera idles until the next
trigger pulse. In this mode the camera exposure can be controlled with the internal
shutter or with the trigger pulse width.
