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COLLISION ALERT SYSTEMS
Object Detection Capability
The PreView® system is designed to supplement other safety practices and/or
devices, and is not to be the sole method of collision avoidance. The machine
operator is always the first line of defense when safely operating a vehicle.
The WorkSight PreView system 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 PreView system operates by transmitting
a pulse of very low power electromagnetic energy. Any energy that strikes an
object reflects a certain amount of this energy back to the PreView sensor. If the
returned energy is of sufficient magnitude, it is used to indicate object presence
and determine the object's distance. While the PreView system 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. A metallic object at the edge of the maximum detection zone might be
detected, whereas a wood object may not.
Scattering – a solid object reflects more energy that 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 below for an example of how angle can affect
return energy.
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