Patent ID: 6943338
Filing Date: 2005-09-13
Classification: G01V

Abstract:
1. An optoelectronic sensor, the sensor comprising a transmitter for transmitting transmitted light; a receiver for outputting at least two received signals in dependence on reflected and received transmitted light; and an evaluation device for determining whether an object or no object is disposed in a detection zone of the sensor, wherein at least one of a difference and a sum of the received signals is compared with one of an upper threshold and a lower threshold, and a positive or negative article detection signal is produced in dependence on the result of the comparison, wherein the upper and lower thresholds are provided to produce a switching hysteresis, wherein a single threshold of the upper threshold or lower threshold is selected in dependence on the article detection signal for the comparison of the at least one of a difference and a sum of the received signals with the single threshold respectively.