Optoelectric sensor and a method for the detection and distance determination of objects

摘要

An optoelectronic sensor (10) for the detection and distance determination of objects in a monitored area (18) transmits a transmission light beam (14), generates a reception signal from remitted transmission light (20), and determines an object distance from a light time of flight. A reception path between light receiver (24) and evaluation unit (30) is divided into a first and a second partial reception path (46, 48, 50, 52) at a splitter element (44) comprising filtering properties to pass higher frequency parts of the reception signal on to the first partial reception path (46, 48) and lower frequency parts on to the second partial reception path (50, 52). An object's distance is determined from the first and an opacity from the second partial reception signal.

主权项

1. An optoelectronic sensor (10) for the detection and distance determination of objects in a monitored area (18), the sensor (10) having a light transmitter (12) for transmitting a transmission light beam (14), a light receiver (24) for generating a reception signal from transmission light (20) remitted or reflected from objects in the monitored area (18), and an evaluation unit (30) configured to determine distance of an object from the sensor based on light time of flight between transmission of the transmission beam (14) and reception of remitted transmission light (20),
wherein a reception path between the light receiver (24) and the evaluation unit (30) is divided into a first partial reception path (46, 48) and a second partial reception path (50, 52) at a splitter element (44), which comprises filtering properties to pass higher frequency parts of the reception signal as a first partial reception signal on to the first partial reception path (46, 48) and lower frequency parts of the reception signal as a second partial reception signal on to the second partial reception path (50, 52), and wherein the evaluation unit (30) is configured to determine whether objects are present in the monitored area (18), to determine the distance of the object from the first partial reception signal, and to determine an opacity from the second partial reception signal.