Light fence with beam divider

摘要

An optic-electronic arrangement to prevent access to or detect objects approaching a protected zone. An emitter/receiver unit is positioned on one side of the zone and an opposing, passive reflector unit is positioned at the other side of the zone. Emitted light is directed from one side of the zone to the other side along a control distance and is divided into a plurality of spatially spaced apart reflected beam portions that extend along the control distance and are detected by sensors in the emitter/receiver unit for further processing.