| 摘要 |
A taut wire fence system comprises wire-supporting anchor posts that maintain the taut wires of the system in tension. Sensor posts having tension sensors mounted therein are positioned between pairs of anchor posts to monitor changes in tension caused by intrusion attempts. To protect against attempts to bypass the tension sensors (such as by cutting the taut wires while using a frame device to maintain wire tension), one or more tensioned cable segments are provided in tension between the anchor posts (preferably along the lower portion of the fence) to form an electrical path. An electrical monitoring device is then used to monitor the continuity of the electrical path. The tensioned cable segments are preferably formed from a special cable that includes an outer layer which forms a physical barrier to cutting. Preferably, the electrical path includes two or more segments of cable that are electrically interconnected by a resistive member, and the monitoring device operates by effectively monitoring the resistance of the path. The cable segments may be provided in place of the lower-most taut wires of a conventional taut wire fence system, or may be provided in between existing taut wires to provide an alternating arrangement of taut wires and cable segments. Also disclosed is a taut wire sensor extender assembly that can be used to add cable segments and/or ordinary taut wires to an existing fence system without the need for additional tension sensors. The sensor extender assembly attaches to an existing tension sensor that is designed to monitor a fixed number (e.g., 2) of taut wires, and allows the sensor to monitor a greater number of tensioned wires.
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