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Taking pictures with the joker² light barrier system
Copyright eltima electronic 2022
Photographing without a reflector
In situations where installing a reflector is
difficult or even impossible and where the
distance between light barrier and subject
is small, it is possible to work without a re-
flector.
The range of the light barrier in this case
depends very much on the reflectivity of
the subject, but is typically no more than
0.3 to 0.6m even for a highly reflective sub-
ject with range set to distance.
Also the precision of the system in this
mode is not as high as when operating with
a reflector, since it is difficult to predict
which parts of the subject will cross the
beam and how well it will reflect.
Nevertheless, this mode may be very at-
tractive in some circumstances. It can work
especially well when working with a large
depth of field or if the subjects are small in
relation to the depth of field.
For this mode set the parameters
scan
for
the light barrier in use to
without re-
flector
.
The parameter
sensitivity
has the fol-
lowing effect: The smaller the value, the
less reflection is necessary for detecting a
subject and vice versa. Hence with small values for the sensitivity the range
increases.
Figure 29: Operation without
reflector