Teledyne PIXIS-XF, System Manual

Page: 72 / 116

72 PIXIS-XF System Manual Issue 5
In multiple trigger mode, the shutter (if there is an external X-ray shutter) is opened
when Acquire or Focus {Run} is clicked and each exposure-shift cycle in the acquisition
is triggered independently by a pulse applied at the EXT SYNC connector. This mode is
useful when each subframe needs to be synchronized with a pulsed external light
source such as a laser. Once the series is complete, the shutter closes and readout
begins. Since the shutter is open during the entire series of images, irregularly spaced
external pulses will result in exposures of different lengths. Once the series has been
read out the camera is ready for the next series. This timing is shown in
Figure 6-18 ,
where a series of 6 frames is collected with 6 External Sync pulses.
Figure 6-18: Timing Diagram: Multiple Trigger
6.5 Custom Modes
Custom Chip and Custom Timing modes are available as an option for WinX/32.
{Custom Sensor} and Custom Timing are standard in LightField (sensor and readout
mode dependent.) These modes are intended to allow data acquisition at the fastest
possible rates for your camera. Custom Chip {Custom Sensor} allows you to reduce the
apparent size of the CCD array and Custom Timing allows you to select a faster vertical
shift time.
6.5.1 Custom Chip
In addition to Binning and Regions of Interest, there is a third way to reduce Readout
Time: Custom Chip {Custom Sensor}. This feature allows you to redefine the size of the
CCD's active area via software. Unlike setting a smaller Region Of Interest (ROI), which
also involves reading out fewer pixels, this mode does not incur overhead from
discarding or skipping the rest of the rows. And, unlike both Binning and ROI, Custom
Chip {Custom Sensor} relies on a form of array masking to ensure that no light falls
outside the currently set active area.
NOTE:
Custom Chip is a WinX option. Custom Sensor is standard
with LightField: availability is sensor-dependent.
NOT SCAN
{Not Reading Out}
Shutter
opening
time
Shutter
closing
time
Readout
START ACQUIRE command from the software issent automatically
when ACQUIRE or FOCUS is clicked on in the software.
External Triggers
Exposure
Shift
SHUTTER
{Shutter Open}
START ACQUIRE
4
4
11
-01
12_0
04
2