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Passive types of perimeter security systems based on the detection technique of minimal electric charge are developed and applied in the test fields. The detection technique of electric charge is based on the triboelectric effect. If two different types of materials are rubbed with each other, electric charges are generated at the friction surface. Simple telecommunication cable can be employed instead of the expensive sensor transducer for sensing the exterior intrusion. Minimal electric charges are generated between the cable conductors and isolator when little forces and impacts are applied to the cable. The developed charge detection device detects the generated minimal charges. The fixed long length of sensor cable is fastened on the various types of perimeter fences. It is a passive sensor fence based on the algorithm of electrostatic charge separation detecting the friction electromotive force. The guard alarm for perimeter fences is generated by signals on the local deformation of the fence and the sensor fastened to it at any unauthorized penetration by getting over the fence. Charge sensitivity of the developed experimental device is 1.6×10 coulombs. This system is expected to be applied widely in more field areas.

Minimal Electric Charge Detection Device for Perimeter Security Systems