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O P E R A T I N G I N S T R U C T I O N S | safeRS3
8027489/2022-03-01 | SICK
Subject to change without notice
5
Functioning principles
5.1
Sensor functioning principles
5.1.1
Introduction
safeRS3 Sensor is an FMCW (Frequency Modulated Continuous Wave) radar device
based on a proprietary detection algorithm. safeRS3 Sensor is also a multi-target
sensor that sends pulses and receives information, analyzing the reflection of the
nearest moving target that it encounters within each protective field.
The sensor can detect the current distance and the angle of the target.
Each sensor has its own fieldset. The fieldset corresponds to the structure of the field of
view, which is composed of protective fields (see
).
5.1.2
Factors that influence the reflected signal
The signal reflected by the object depends on several characteristics of the same
object:
l
material: metallic objects have a very high reflection coefficient, while paper and
plastic reflect only a small portion of the signal.
l
surface exposed to the sensor: the greater the surface exposed to the radar, the
greater the reflected signal.
l
position with respect to the sensor: all other factors being equal, objects positioned
directly in front of the radar generate a greater signal with respect to objects to the
side.
l
motion speed
l
inclination
All these factors have been analyzed for a human body during the safety validation of
safeRS3 and cannot lead to a dangerous situation. These factors may occasionally
influence the behavior of the system causing spurious activation of the safety function.
5.1.3
Detected and missed objects
The signal analysis algorithm takes into consideration only those objects that move
within the field of view, ignoring completely static objects.
Furthermore, a
falling objects
filtering algorithm allows ignoring undesired alarms
generated by small work waste products that fall within the field of view of the sensor.
5.2
Protective fields
5.2.1
Introduction
The field of view of each sensor can be composed of up to four protective fields. Each of
the four protective fields have a dedicated detection signal.
WARNING
Configure the protective fields and associate them with the dual channel safety outputs
according to the risk assessment requirements.
5 FUNCTIONING PRINCIPLES
