Pyrocam III
HR
User Guide
Document No. 50361-001
Rev E
7/18/2017
Page 18
Hint:
For laser pulses that occur simultaneous with the trigger rising edge and are shorter than
100µs, set the
Delay
time to -50µs and set the
Exposure
time to the pulse width plus
70µs.
NOTE:
Calibrating the Pyrocam with a slow pulse rate in mode 2 will take a while to complete,
so be patient
.
Figure 3.2 : Mode 2, Periodic,
𝟑𝑯𝒛 < 𝒇
𝒕𝒓𝒊𝒈
< 𝒇
𝒎𝒂𝒙
𝑓
𝑚𝑎𝑥
= (8.705𝑚𝑠 + 𝑇
𝐸
)
−1
𝑻
𝑫
= −(𝑻
𝒕𝒋
+ 𝟏𝟎)
𝑇
𝐸
= |𝑇
𝐷
| + 𝑇
𝑙𝑤
+ 20
for
𝑇
𝑙𝑤
< 100
𝑇
𝐸
= 𝑇
𝑡𝑗
+ 1.15 𝑇
𝑙𝑤
for
𝑇
𝑙𝑤
≥ 100
3.3.5
Mode 2, Periodic-Burst Operation
The
Delay
timer can be used to capture (split-out) a single laser pulse from a burst of pulses.
demonstrates this timing for a periodic burst event; however this same scheme
can be used for a single shot burst event. The
Delay
time needs to expire just a few tens of
µs before the pulse to be captured, and the
Exposure
time to end slightly longer than the
pulse width. Observe that the
Trigger
pulse must only occur once per burst.
