BOBCAT Hardware User’s Manual
Imperx, Inc.
Rev. 1.0
6421 Congress Ave.
5/4/2010
Boca Raton, FL 33487
+1 (561) 989-0006
83 of 212
CAUTION NOTE
1. The time interval between the trigger pulses must be greater than the
corresponding camera frame time. If the time between the triggers is shorter, the
frame read-out cycle will be interrupted and part of the frame will be lost.
DATA
EXPOSURE
STROBE
N + 2
DATA N - 1
DATA N
DATA N + 1
Exposure N
Exposure N+1
SHUTTER
TRIGGER
N + 1
N
Only if the main strobe is enabled
Figure 2.15 – Fast synchronized triggering - rapid capture
C.
Double Exposure Triggering
Double exposure allows two events (two images) to be captured in rapid succession
using a single trigger pulse. In this mode, the camera idles and waits for a trigger
signal to come from the selected source. Upon receiving the external trigger signal,
the camera clears the horizontal and vertical registers, and starts integration. There
is NO DELAY between the active trigger edge of the trigger pulse and the
beginning of the integration. 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 captures the second image. While capturing the
second image the first one is being read out. After exposing the second image, the
information is transferred to the vertical registers and read out – Figure 2.16. 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. The number of frames captured is set to 2 and cannot be
changed. There is NO DELAY between the frames captured.
