PreView Sentry ST82 Series, Руководство по эксплуатации, Страница: 17 / 25

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Page 13
Object Detection Capability
The PreView
®
Sentry
™
system is a blind spot collision warning system
designed to supplement other safety practices and/or devices. The
machine operator is always the first line of defense when safely operating
a vehicle. The person or owner responsible for the equipment must ensure
that all operators understand the installation, operation, limitations and
safe use of the system.
The Sentry
™
can detect most objects within the detection zone. However,
there are some instances where objects can go undetected. Obstacle size,
shape, relative location, and composition are all factors determining if,
when, and where an object is detected. The Sentry
™
operates by
transmitting low power electromagnetic energy. Any energy that strikes an
object reflects a certain amount of this energy back to the PreView
®
Sentry
™
radar sensor. If the returned energy is of sufficient magnitude, it is
used to indicate object presence and determine the object’s distance.
While the Sentry
™
can resolve multiple objects, only the object closest to
the vehicle is reported to the operator display since it represents the most
significant collision threat.
The amount of energy returned is based on a few factors:
Size – a larger object usually reflects more energy than a smaller
object.
Composition – a metal object typically reflects more energy than a
non-metallic object.
Scattering – a solid object reflects more energy than a non-solid
object such as tree branches, gravel, bushes, etc.
Shape – complex shapes cause energy to be returned in a very
non-uniform way. Very small variations or movement can change
detection status.
Angle – an object flat side perpendicular to the sensor will reflect
more energy than an object at an angle. See Figure 14 for an
example of how angle can affect return energy.