Mikrotron eosens TS3, Руководство пользователя, Страница: 106 / 120

TS3 User Manual
11S-3000M
page 97
Application Note 3: Trigger Position and the Circular Buffer
Capturing a high-speed event can be a tricky proposition. O ft en high speed events that we are
interested in happen without warning. Other times high speed e vents are tig h tly controlled. The
TS3 is designed to handle myriad scenarios. Here are several examples:
Example 1: Someone is blowing up a balloon until it po p s. You want to capture the balloon pop.
You have a partition of mem or y with one second of record time. It is v ery difficult t o estim a te
within a second when that balloon is going to pop!
Example 2: Jams happen once or twice a day on an automated production line. When th e y occur,
they may set off a chain of vents that you would like to capture. The jam is detected by sensors on
the machinery that is propagated to various parts of the line. You need to image the time ju
s t before
the jam occured to help understand the cause. You are equally as interested to capture the time ju s t
a ft er the event to understand how the equipment reacted to the jam.
Example 3: You would like to image the launch of a missile. You have ample warning when ignition is
to happen. There is a long count down. There may even be a signal available at launch time
In order to capture events like the ones in the examples above, the TS3 uses a circular image bu ff er
that is able to capture high speed imagery indefini t ely, though it may only be able to retain a few
seconds at a time. The fig ur e below is a representation of a ci r cular bu ff er. First the empty bu ff er is
seen with 20 empty slots for images. The second graphic shows the fi r st four frames. With each
frame added, the older images are shi ft ed up, the newest ones added at the bo tt om.
R
E
N
E
.
W
O
L
D
>
E
R
<
<
<
>
Shift
R
E
N
E
.
W
O
L
D
>
E
R
<
<
<
>
Shift
Figure 10-5: Circular Buffer Fills and Images Shift Position