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LASER
The Laser Speed Detection System, also called LIDAR (for Light
D
etection 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 slowly and over a longer distance than a
radar signal.
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 LRD 747/LRD 757 can detect these light pulses from as far
away as 1.5 miles, which is about four times the effective
range of a laser gun (2,000 feet), and about ten times its
average operating range (500-800 feet).
5
To be safe, do not
ignore any warnings.
Although there are
other types of radar
signals that may
cause interference,
when the
LRD 747/LRD 757
detects a signal, be
on the alert. It is
important to exercise
caution at all times.
SPEED DETECTION
C:\Manuals\LRD747\LRD747-757.vp
Tue Oct 05 11:28:44 1999
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