Patent ID: 8803065

Claim:
A method for the pulsed operation of a light barrier that can be operated in a normal mode and in a compensation mode, there being run through repeatedly a cycle that comprises the following steps: a) transmitting electromagnetic radiation over a transmission period Δt transmit by means of a transmission device, b) recording measured radiation values I i of the electromagnetic radiation at various measurement times t meas within the transmission period Δt transmit by means of a detector, and c) establishing whether extraneous light is incident on the detector by examining a measured value curve of the recorded measured radiation values I i , the respectively next cycle in the normal mode being run through when no extraneous light is incident, and in the compensation mode when extraneous light is incident, at least one compensation measure being carried out in the compensation mode in order to compensate the influence of extraneous light, wherein the measured value curve is examined for a positive curvature.