42
Taking pictures with the joker² light barrier system
Copyright eltima electronic 2022
Improving the alignment of the reflector
If the distance between the light barrier and the reflector is greater than 3 -
4 m, it makes sense to point the light beam exactly at the centre of the re-
flector.
To achieve this, swivel/pivot the light barrier to the right, starting from the
previously determined position, until the length of the reflection bar begins
to decrease and remember this point. Then swivel the light barrier to the left,
also to the point at which the length of the reflection bar begins to decrease.
The centre between these two points is the horizontal midpoint of the reflec-
tor.
Now align the light barrier to the vertical centre. To do so proceed as de-
scribed above, but in the vertical direction.
Minimum distance to the reflector and sensitivity
When photographing small objects, such as water drops, small insects, etc.,
it is advisable to choose a distance of less than 1 m between the light barrier
and the reflector. Furthermore, it is advisable to use a 40 mm reflector (Art.
No.: 50018, not included in the scope of delivery).
In principle it is also possible to use a 80 mm reflector for this purpose, how-
ever it will be necessary to work with a very high sensitivity level (level 1-2),
due to the high amount of reflected light. That in turn requires a very steady
setup completely free of vibrations.
The training process
After the light barriers have been aligned, switch to the working level by
touching the
-key. Now the light barriers are ready to work. An interrup-
tion of a beam sets a trigger and this in turn leads to the switching of one or
more outputs.
During the training process, the light barrier system measures the amount of
light received and remembers it. Changes of this over a measure, which is
predetermined by the parameter
sensitivity
will lead to a trigger.
The training must be carried out again after every change of the set-
ting, such as changing the position of a light barrier or a reflector, in-
sertion or removal of a light barrier, etc.