Varex Imaging 2315NDT, Руководство пользователя

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USER
MANUAL
30 www.vareximaging.com
2315NDT v2 CMOS X-ray Detector User Manual
19.1.2 Continuous Readout - External Edge Trigger
In External Edge Trigger, the detector is triggered by an external signal, for example, Pulse
Generator. The detector exposure time is pre-defined by the software (SCap or API). In SCap, this
source is selected by using Configuration – External Trigger – External Edge Trigger and by
following these steps:
1
Before an exposure, the detector is continuously reading dark frames from the sensor.
2
The user activates an external signal that drives SyncIn high.
3
When the detector receives the trigger, the SyncOut 1 signal changes its status and the sensor
finishes the ongoing frame readout (T
R
).
4
After T
R
, the detector enters the exposure window (T
EW
), and the SyncOut 2 level changes.
5
At the same time, the detector starts accumulating the image on the sensor.
6
The user can configure the X-ray to be active during T
EW
.
7
After the detector’s programmed exposure window T
EW
, the frame is read out and
transmitted to the PC. SyncOut 1 and 2 go back to their initial values.
8
The detector resumes the dark frame readout cycles until the next SyncIn pulse.
The External Edge Trigger behavior is similar to the Software one, but the trigger signal comes
from an external source and it is directed to the SyncIn port. The timing specifications are the
same as for Software Trigger source shown in Figure 8, “Continuous readout - Software Trigger
Schematic,” on page 28 .
SyncOut 2 indicates when the detector is ready to accept a SyncIn pulse. It is low (inactive)
during a system reset cycle, during power-down (sleep) mode, and during a frame exposure
cycle.
Figure 10 shows an example of External Edge Trigger configuration.
Figure 10 Sync Connection for Edge Trigger