Opto-electrical sensor arrangement

aThe invention relates to an opto-electronic sensor arrangement with an optical transmitter and an optical receiver, such that the optical transmitter and the optical receiver are so positioned that they either form an optical scanner designed as an optical scanner with background gating or form a reflecting light barrier in conjunction with a reflector, and such that the optical receiver has a detector in which successive images of the light beam reflected from the object are detected and are compared in an evaluating unit, and the outcome of the comparison provides information on the movement of the object relative to the optical receiver, so that the detector exercises a movement function.