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Working principle of tension-type electronic fences: A tension-type electronic fence is a physical barrier designed to prevent people from crossing it, as well as an electromechanical system capable of detecting attempts at climbing, pulling, pushing, or cutting through it. It represents a new type of perimeter intrusion detection alarm system. It is a \"tangible\" alarm system that provides intruders with a visible deterrent, exerting psychological pressure on them; it integrates alarm functions with surveillance measures to achieve a prevention-first approach that combines prevention and early warning. After installing this system, it creates a \"tangible\" electronic barrier on top of the wall, increasing its height and making it difficult to climb over or escape from either side of the wall. Due to its innovative detection method and special signal processing techniques, the tension-based electronic fence minimizes the impact of environmental factors on changes in the tension alarm threshold, thereby offering significantly improved environmental adaptability compared to infrared perimeter detectors. System composition: A tension-type electronic fence consists of three parts: mechanical components, electronic components, and structural components. The mechanical and electrical components consist of tension detectors, etc. A tension detector is a device that operates based on the tension characteristics of an electronic fence; it uses steel wires under tension due to attempts at climbing, pulling, or cutting in order to respond to any attempts at intrusion and generate an alarm signal. The zone controller is used in conjunction with tension detectors; it collects and processes the signals generated by one or more of these detectors within a given zone, in order to determine whether an alarm should be triggered. In other words, it provides the system with information regarding the status of that perimeter zone, such as whether an alarm has been triggered or not. Electronic components include a bus communication module and a DC power supply (power controller). This bus communication module is the one mentioned in the active infrared perimeter alarm system discussed in the previous section; it transmits the alarm signals from the detectors to the alarm control unit over a distance. The bus communication module can be provided by the tension cable manufacturers, or by third-party alarm system manufacturers. The DC power supply must be selected in conjunction with the tension detector and zone controller, and is generally provided by the manufacturers of tension cables. Mechanical components include steel cables and devices for installing, fixing, supporting, and tightening the cables, such as control rods, load-bearing rods, support rods, universal brackets, universal bearing brackets, springs, fastening nuts, etc. Electronic Fence www.lacme.net.cn