As an example we’ll work with the star effect shown below and with the parameters of quality scanning
system:
Let’s say the star effect is made of 300 graphical points (including non-visible blanking points) and we
know that the maximal scan-rate of our scanning system is 35kpps @ 8 degrees (= 35.000 points per
second at 8 degrees projection angle). We also know that we display the star 35 times per second which
is a default frame rate of the control software we are using.
So we need to display 300 points 35 times per second = 10.500 pps. This means that we could display 3
of these stars beside each other within one single laser effect and that it would be quite close to the
scanner limit (3 × 10.500 = 31.500pps). This however applies ONLY if the scanning angle is not more
than 8 degrees on both axes! If we start to increase the size of the projection (scanning angle) it is
necessary to either lower the number of points within the effect or drop down the scan-rate in the control
software (FPS) to a safe level – which may result in flicker.
From the example above we can also determine how many points this scanning system is able to project
if the scanning angle is not more than 8 degrees:
35.000 points / 35 Frames Per Second = 1.000 pps. This is the absolute maximum of how many points
we should be using when programming an effect if the scanning angle is not more than 8 degrees.
In the following pictures you see the same star effect scanned at different scan rates at full scanning
angle (60 degrees).
Picture 1
: the scan rate and/or number of points is too low. The corner points are more visible
than the lines between them and the whole effect flickers. The scan-rate and/or number of
points needs to be increased.
Picture 2
: the scan-rate and/or number of points is about right. The whole effect has more or
less the same intensity and does not flicker.
Picture 3
: further increasing of the scan-rate and/or number of points results in the effect
starting to distort, firstly around corners only. This indicates that you are exceeding the maximal
scan rate of the scanning system! If you operate the scanning system at scan-rates higher than
the maximum scan-rate of the scanning system the scanners will get damaged irreversibly due
to overheated coils damaging rotor magnets.
Kvant spol. s.r.o.
Spectrum series - v16816
Page 10 of 38
