| 摘要 |
PCT No. PCT/SE93/00071 Sec. 371 Date Jul. 28, 1994 Sec. 102(e) Date Jul. 28, 1994 PCT Filed Feb. 1, 1993 PCT Pub. No. WO93/15416 PCT Pub. Date Aug. 5, 1993A device for supervising an area (16), in particular the crossing area between railway gates, in order to detect objects occurring in the area comprises a detector (18) adapted to transmit detection signals and receive their reflection caused by objects. The detector (18) is pivotably arranged in a reciprocal manner so as to transmit the detection signals in an angular area. The detector (18) may be a laser, the light of which forms the detection signals.
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