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Chapter 9: LightField and Dual Image
Feature
The purpose of the PI-MAX4 Dual Image Feature (DIF) is to acquire a pair of gated images
in rapid succession. The time between frames can be as short as 450 ns: the second image
will have some remnants from the first image due to the longer persistence of the P46
phosphor. Exposure times can be as short as 2.5 ns. The DIF capability is ideally suited to
capturing rapidly evolving events. These experiments will fall into one of two broadly
applicable categories:
• Readout Per Trigger (i.e., single trigger,) experiments;
Single trigger experiments involve a single impulse event that evolves over time,
such as a laser-induced plasma or luminescence decay.
• Shift Per Trigger (i.e., dual trigger,) experiments.
Dual trigger experiments involve two impulses separated in time, such as double
laser pulse velocimetry measurements.
NOTE:
The PI-MAX4:1024i is currently the only PI-MAX4 camera on
which DIF is supported.
9.1 Requirements
For DIF operation, the PI-MAX4 must use an interline CCD and DIF must be the selected
Readout Mode on the Readout expander,. See Figure 9-1.
Figure 9-1: Readout Expander
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