Optoelectric Sensor and Method for the Detection and Distance Determination of Objects

摘要

An optoelectronic sensor (10) for distance determination comprises a transmitter (12) for transmitting a light beam (14) having a plurality of consecutive individual light pulses, a rotatable deflection unit (16) for deflecting the light beam (14), an angle measuring unit (28) for determining an angular position of the deflection unit (16), a light receiver (24) for generating reception pulses from remitted transmission light, a plurality of histogram memories (34) each associated with an angular position, and an evaluation unit (30) which is configured to accumulate time histograms in the histogram memodes (34) across several periods of the rotational movement of the deflection unit (16) from reception pulses which are each detected at the angular position associated with the respective histogram memory (34), and to determine, from the histograms of the associated histogram memory (34), an object distance for an angular position.

主权项

1. An optoelectronic sensor (10) for the detection and distance determination of objects in a monitoring area (18), the sensor (10) comprising
a light transmitter (12) for transmitting a transmission light beam (14) having a plurality of consecutive individual light pulses, a rotatable deflection unit (16) for a periodic deflection of the transmission light beam (14) in the monitoring area (18), an angle measuring unit (28) for determining an angular position of the deflection unit (16), a light receiver (24) for generating reception pulses from transmission light remitted or reflected by objects in the monitoring area (18), at least one histogram memory (34), and an evaluation unit (30) which is configured to accumulate a time histogram from a plurality of reception pulses in the histogram memory (34) and to determine, from the histogram, a light time of flight from the sensor (10) to an object and therefrom an object distance,characterized in that
a plurality of histogram memories (34) is provided each associated with an angular position, and in that the evaluation unit (30) is configured to accumulate time histograms in the histogram memories (34) across several periods of the rotational movement of the deflection unit (16) from reception pulses which are each detected at the angular position associated with the respective histogram memory (34), and to determine the object distance for an angular position from the histogram of the associated histogram memory (34).