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Chapter 9 LightField and Dual Image Feature 159
Perform the following procedure to configure a dual trigger DIF experiment:
1. The PI-MAX4 camera must be aligned and focused on the area of interest for this
experiment. This is best accomplished while the PI-MAX4 is operating in Full Frame
readout mode (i.e., before switching to DIF mode on the Readout expander.)
Verify that the Phosphor Decay Delay is appropriate to the phosphor used by the
camera. The Phosphor Decay Delay time entered in LightField can be viewed or
changed by clicking on the Advanced button on the Common Acquisition Settings
expander.
NOTE:
The Phosphor Decay Delay setting is used to tell LightField
how long to wait after the gate pulse to shift the image. If there
is some residual image from the first frame in the second
frame, simply increase the Phosphor Decay Delay setting to
allow more time for the phosphor emission to decay before
shifting the image. If residual image is not an issue, then the
Phosphor Decay Delay setting can be decreased to reduce the
time between the two DIF images.
2. After the alignment and focus, the PI-MAX4 system needs to be put into DIF mode.
• On the Readout expander, select DIF as the Readout Mode.
• On the Common Acquisitions Settings expander, configure the Number of
Frames to a multiple of 2 (i.e., 2, 4, 6, etc.)
3. On the Trigger expander, verify that Trigger Response is set to Shift Per Trigger.
4. On the Trigger expander, select Internal or External triggering.
When using External triggering, verify the trigger characteristics on the Trigger
expander match the active trigger edge, etc., for the trigger pulse being used.
When using Internal triggering, perform the following procedure to configure the
Internal Trigger parameters on the SuperSYNCHRO expander:
a. Open the SuperSYNCHRO Timing expander at the bottom of the window.
b. Use the hyperlinks at the top of the expanded panel to make any changes to:
• Intensifier Settings;
• Trigger Settings;
• Phosphor Decay Delay Time;
• Number of Frames (i.e., must be a multiple of 2);
• Readout Mode (i.e., DIF or Full Frame.)
c. When using PI-MAX4-generated internal triggers for DIF acquisition, configure
the Internal Trigger Frequency.
d. Enter the Gate Width and Gate Delay times for the first and second images.
• The Initial Gate Delay time will be 85 µs.
• The Second Gate Delay time will be 441 µs.
e. If required, set up AUX Output Trigger.