Optical sensor evaluates code imposed on received light beam by pattern of reflection or transmission coefficients on active surface of reflection or transmission element in monitoring area

摘要

The device has at least one transmitter (4) emitting a light beam (3), a receiver (6) of light beams (5) and an evaluation unit (7) for evaluating the reception signals at the receiver. The transmission light beams pass via a reflection or transmission element in the monitoring area with an active surface with a defined pattern of reflection or transmission coefficients imposing a code on the received light beam detected in the evaluation device.