Princeton Instruments PI-MAX4, Manual

Page: 169 / 326

Chapter 9 LightField and Dual Image Feature 169
Figure 9-16 illustrates the timing diagram for a dual-trigger DIF acquisition.
Figure 9-16: Timing Diagram: Dual-Trigger DIF Acquisition
Perform the following procedure to configure a dual-trigger DIF acquisition:
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 within the
Common Acquisition Settings
expander.
NOTE:
The
Phosphor Decay Delay
setting tells LightField how long
to wait following the gate pulse before shifting 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 placed into DIF mode.
•
On the
Readout
expander, select
DIF
as the
Mode
.
•
On the
Common Acquisitions Settings
expander, configure the
Frames to Save
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
.
D1 W1 PD D2
SHIFT
BEHIND
MASK
TT
TRIGGER
W2 PD
SECOND FRAME FIRST FRAME
IMAGES
',QLWLDO*DWH'HOD\• P
S)
PD: Phosphor Decay Time
W1: Pulse 1 Gate Width
777LPHEHWZHHQ7ULJJHUV•':3'
D2: Pulse 2 Gate Delay
•PLQLPXPFDPHUDGHOD\aQ6
W2: Pulse 2 Gate Width
4411-
0139_
0097