| 摘要 |
<p>This invention relates to an intrusion warning wire fence secured to spaced supporting poles (2) and comprising one or more electrical and/or optical conductors (8), preferably optical fibres, which may be either incorporated within one or more tubular wires (3) of said wire fence and/or associated exteriorly with one or more wires of said fence, and/or arranged freely in the fence, and which are connected to an intrusion warning system capable of emitting a warning and/or alarm signal in case of breakage or reduction of the conduction capability of at least one of said conductors (8). According to the invention, in order to prevent anyone from stepping over the fence, the latter is extended upwards beyond the upper ends of the supporting poles (2), and this upper unsupported portion of the fence will be either distorted (bent, flexed) and/or broken, at least locally, if anyone tries to step over the fence. Extending in the upper unsupported portion of the fence and/or between this upper unsupported portion of the fence and the suppoting poles (2), and/or between said upper unsupported portion and the underlying portion of the fence which is stretched between the supporting poles (2), is at least one electrical and/or optical conductor (8) which will be either broken or distorted (bent, stretched, crushed) as a result of any breakage or distortion of the upper unsupported portion of the fence, so as to provide a warning or alarm signal.</p> |
