Pyrocam IV Operator’s Manual Document No. 50337-001 Rev F 2/21/2017 Page 17
(All times are in µsec unless noted otherwise)
3.3.3 Mode 1, Single-Shot Operation
Mode 1 describes operation when the laser fires at a trigger rate of <3Hz, including non-
repetitive or Single-Shot triggers. Figure 3.1 diagrams the trigger timing requirements
for this mode of operation. In this mode, the laser must fire within an exposure time
window that begins 10µs after the rising edge of the applied trigger. The entire laser
pulse duration must be contained within the programmed Exposure time. In general,
you should program the Exposure time to extend 10-15% longer than the actual laser
pulse width.
To remain in mode 1, you must restrict your trigger rates to be <3Hz. The Pyrocam
automatically switches from Mode 1 to Mode 2 if the trigger rate meets or exceeds 3Hz.
Figure 3.1 : Mode 1, Single Shot,
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3.3.4 Mode 2, Periodic Operation
In Mode 2 trigger pulses must arrive at a periodic rate. Refer to Figure 3.2. The
Exposure time should be set to contain just the pulsed event to be captured. If the
exposure time is set too long (after the pulse) it will result in a loss of signal due to array
cooling before detector readout.
If the trigger source is unstable or turns on and off, some loss of uniformity shot to shot
will likely result. For best operation, calibrate the Pyrocam at the trigger rate being used
and recalibrate if the rate changes.
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