Polygon scanner for capturing objects in a surveillance area

摘要

A polygon scanner (10) for detecting objects (24) in a surveillance area (22) with a light transmitter (12) for emitting a light beam (16) into the surveillance area (22), with a light receiver (30) for receiving objects (24 ) in the monitoring area (22) of reflected light beam (26), with an evaluation unit (32) for evaluating a received signal of the light receiver (30) and with a rotatable mirror unit (20) for periodically deflecting the light beam (16), the plurality of mirror facets (34 ) so as to scan as a monitoring area (22) an angular section several times per revolution of the mirror unit (20) with a respective mirror facet (34), wherein at least some of the mirror facets (34) have a different curvature with each other, characterized in that at least one of Mirror facets (34) is designed as a free-form surface, the curvature of which varies during the rotation of the mirror unit (20) Incident angle of the emitted light beam (16) on the mirror facet (34) is adapted.