Reflection light barrier sensor

摘要

The sensor (10) has a sender unit (12) e.g. LED or infrared diode, sending transmission light (4) towards a retro-reflector (20). A receiver unit (26) receives received light (6) reflected by the reflector, and a beam splitter (18) is arranged in transmission and received light paths. A transmission polarizer (16) is arranged between a transmission imaging element (14) and the beam splitter. A receiving polarizer (22) is arranged between the beam splitter and a receiver imaging element (24) that is arranged adjacent to the beam splitter in a dispersion direction of the received light.