Optoelectronic sensor

US8288707B2 · kind B2 · utility

Assignee

• SICK AG · DE

Inventors

• Maximilian Hauske · Mannheim, DE
• Ralph Tanbourgi · Heidelberg, DE
• Kai Waslowski · Trento, IT
• Gerhard Merettig · Waldkirch, DE

Key dates

• Filing date: Mar 3, 2010
• Grant date: Oct 16, 2012
• Expiry date: May 7, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V8/12
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An optoelectronic sensor includes at least one light transmitter for the transmission of light signals into a monitored zone and at least one light receiver for the reception of transmitted light signals. In this respect, the received light signals are converted into electrical received signals in the light receiver. The light signals transmitted by the light transmitter are each generated on the basis of an output signal spread in accordance with a frequency spreading technique (spread spectrum) and provided with an offset applied for the generation of a unipolar signal. The electrical received signals can be supplied to a high-pass filter in the light receiver. Means for interference suppression are provided to automatically measure repeatedly or continuously respective then current interference; to analyze it in the time domain and/or in the frequency domain; and to compensate it at least substantially in dependence on the respective result of the interference analyses.