Sensor and method for distance measurement

US11047960B2 · kind B2 · utility

Assignee

• SICK AG · DE

Inventors

• Simon Franzreb · Waldkirch, DE
• Fabian JACHMANN · Waldkirch, DE

Key dates

• Filing date: Apr 10, 2017
• Grant date: Jun 29, 2021
• Expiry date: Jun 23, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S17/42
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A distance-measuring optoelectronic sensor (10) uses two sampling memories for detection of objects in a monitoring zone (20). The sensor (10) has a light transmitter (12) for transmitting a transmission light pulse (16) into the monitoring area (20), a light receiver (26) for generating a reception signal from the light pulse (22) remitted by objects in the monitoring area (20), a control and evaluation unit (32) configured to determine a reception point in time from the reception signal and the distance of the object by means of a light time of flight method, and a first and second sampling memory (34a, 34b) having a plurality of memory cells each for storing a section of the reception signal. Partially overlapping recording regions are used, with each alternately recording a reception signal for a longer duration than a time interval between two successive transmission light pulses (16).