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Chapter 8 Experiment Synchronization 75
Figure 8-4: Timing Diagram: Bulb Trigger {Expose During Trigger Pulse}
8.2.4 Trigger Start {Start On Single Trigger}
In this mode, the camera requires only one trigger to acquire a sequence of frames. Once the
initial trigger has been received, the camera ignores any further triggers until the entire
exposure/readout sequence has been completed.
8.3 Fast Mode
When using WinView/32 or WinSpec/32 and are operating in Fast Mode, NIRvana-LN runs
according to the timing of the experiment, with no interruptions from the computer. Fast
operation is primarily intended for collecting real-time sequences of experimental data
where timing is critical and events cannot be missed. Once the NIRvana-LN has sent the
start command by the computer, all frames are collected without further intervention from
the computer.
The advantage of this timing mode is that timing is controlled completely through hardware.
A drawback to this mode is that the computer only displays frames when it is not
performing other tasks. Image display has a lower priority, so the image on the screen may
lag several images behind. A second drawback is that a data overrun may occur if the
number of images collected exceeds the amount of allocated RAM, or if the computer
cannot keep up with the data rate.
NOTE:
Only Fast Mode should be used when running a NIRvana-LN
detector via WinSpec. Do not select Safe Mode if the choice is
available. LightField always uses Fast Mode.
Figure 8-5 shows a flow chart for Fast Mode operation.
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