OPTOELECTRONIC SENSOR

An optoelectronic sensor for the detection of objects in a monitored zone having a light transmitter for transmitting transmitted light, having a measurement light receiver for generating a received signal from transmitted light reflected by objects in the monitored zone, having a control and evaluation unit for determining information on objects in the monitored zone using the received signal, and having one or more optical elements that are arranged in the optical path of the transmitted light of the light transmitter such that some of the transmitted light moves into the monitored zone as detection light, wherein the optical element conducts some of the transmitted light to a reference light receiver, wherein the measurement light receiver and the reference light receiver are arranged on a semiconductor component, with the semiconductor component being arranged on a circuit board, and with the measurement light receiver only being illuminated by the portion of the transmitted light through the side of the semiconductor component facing the circuit board.