KVANT Spectrum Series Operational Manual

10  41
EN
2.5
 
The product warranty does not cover the damages
to the scanning system caused by improper use of the
scanning system orbyincorrect programming. Therefore
itisessential tounderstand how the scanning works and
where are the limits of it. In this manual we will explain
only the basics ofitbut itisthe responsibility ofevery user
toeducate themselves sothey can avoid damage being
caused tothe scanning system and costly repairs.
Alaser beam comes from alaser module and hits the two
moving mirrors ofthe scanning system. These mirrors are
mounted on the scanner shafts and are moved by the
scanner rotors, one onXand one onYaxis.
Aneect such astunnel (circle) isdisplayed byarepetitive
mechanical movement of the scanners. For each
scanning system and eect, there’s a maximal scan-rate
that is defined by mechanical load, scanner mirror size
and weight, complexity of displayed picture and size
ofthe projection (anangle under the laser beam isbeing
projected). A dierent scanning systems have dierent
scan-rate limits. It is essential to operate the scanning
system at scan-rates within its maximal limit at all times
toprevent itfrom overload damage.
How toestablish correct Scan-rate and maximal
number ofpoints inaneect
Each eect (picture) contains adierent number ofgraphical
points which defines the actual shape of the eect. The
more points an eect contains, the lower the maximum
scan rate will beinrelation tothe scanning angle.
Asanexample we’llwork with the star eect shown below
and with the parameters ofquality scanning system:
Let’s say the star eect is made of 300 graphical points
(including non-visible blanking points) and we know that
the maximal scan-rate of our scanning system is “35K”.
(The term “35K” refers toametric that isachieved when
the original ILDA test pattern is projected at 8 degrees,
and all ofits visual qualities are maintained. Note that all
other patterns may bescanned much wider, and insome
cases even faster, but the term “35K” only refers toasingle
test pattern, and single test condition). 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 eect and
that itwould bequite close tothe scanner limit (3 × 10.500
= 31.500pps). Given that the scanners noted above are
“35K” scanners, this seems easily achievable. However,
the projection of 3 separate stars necessitates a wider
scan angle, and – in general, the scan speed must
be reduced as the projection angle is increased. Thus,
itmay benecessary toeither lower the number ofpoints
within the eect ordrop down the scan-rate inthe control
software (FPS) toasafe level – which may result inflicker.
for standard types

KVANT Spectrum Series Specifications

General

Brand	KVANT
Model	Spectrum Series
Category	Measuring Instruments
Language	English