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Laser
The Laser Speed Detection System, also called LIDAR (for Light
Detection and Ranging), uses a laser gun that emits infrared light pulses
just outside the spectrum of visible light. Each reflected pulse measures
the speed of the object coming toward or going away from the laser gun.
Unlike radar, the laser gun emits a very narrow beam of light, so it can
pinpoint a speeding car within traffic. The infrared beam spreads out, but
slower over a longer distance than a radar signal.
0.4 km
0.8 km
2.5 km
~"""=:~i::::::::::::t:::==:::~~=::::~::::::~:::~::~::~:::::::~::~:~~::~~:~::~.
1.5m
wide
3m
wide
gm
wide
The laser gun can acquire a speed reading as quickly as 0.3 seconds,
sometimes less. However, since it isn't easy to accurately aim at and hit a
moving target, an operator often moves the laser gun in several directions to
get a reading. So laser signals are emitted continuously for a few seconds for
each speed measurement. The SWS2500NZ can detect these iight pulses
from as far away as 2.5 km, which is about four times the effective range
of a laser gun (625 m), and about ten times its average operating range
(150-250 m).
Note: To be safe, do not ignore any warnings. Although there are
other types of radar signals that may cause inteiference, when
the SWS2500NZ detects a signal, be on the alert. It is important
to exercise caution at all times.
3
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