| 摘要 |
The access control post (2) has a vertical barrier (4) comprising at least three beams at the front at a height of 300 mm, 700 mm, 1100 mm relative to the floor and a horizontal barrier (5) comprising at least ten beams. The barriers have self-monitoring and testing photoelectric emitter/receivers. Each emitter/receiver works with two mirrors which reflect the beam between them before its return. They are arranged so that one may be the image of the other in a mirror and they are fixed onto a triangular support which has a tenon on its upper and lower surfaces. The alignment of the mirrors is set up using an integral laser (10). |
