| 摘要 |
Optoelectronic access protection system for monitoring a protection area (1) has an optical barrier arrangement with a light emitter (3) receiver (4) and beam deflection mirrors (6, 7). Transmission and received light beams has beam profile lobes that have a greater extent in the direction perpendicular to the separation between the transmitted and received beams than parallel to it, so that the beams do not overlap. |
