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Perimeter signaling

The system of defence of perimeter is one of the most major elements of the complex system of safety of object and obligatory for especially important objects, such as nuclear power and thermal plants, airports, Oil enterprises.
In the process of planning of the systems of defence of perimeter it is necessary to take into account next features:
1. Exploitation of the perimeter systems of signaling comes true in various climatic and soil-geological terms. Seasonal fluctuations in a temperature in many regions are from - 45... 50 With, that results in the hard requirements of maintenance of capacity of device in difficult climatic terms.
2. The perimeter systems of signaling must with a high probability find out the various methods of overcoming of perimeter : climbing over through a protection, doing of manhole in a protection, undermining of and other 1
3. Perimeter facilities of signaling must save a capacity at presence of hindrances of different origin :
1. topography of object and hypsography;
2. soil-geological structure of the controlled borders;
3. neighbourhood of railway and motor-car highways,
, cable busses;
4. ways of migration of animals.
Modern perimeter facilities of discovery can be classified on physical principles of work.
Electromechanics facilities of discovery - a pickoff are the strained wire filaments with end-capping sensors. Gaping over of filaments, their precipice or having a snack is brought to delivery of signal by "Alarm".
Oscillation facilities of discovery - the cable sensors of vibrations come forward as a pickoff; systems of point sensors of vibrations (piezoelectric, electromagnetic). Principle
of action is based on the vibrations of linen ofprotection at climbing over or doing of opening. Capacity facilities of discovery - the change of capacity of pickoff at climbing over or doing of opening results in the wearing-out of the system.
Inductive facilities of discovery - the change of inductance of loop of
at gaping, precipice or scission of wires results in the wearing-out of the system.
Radioradial facilities of discovery - based on carrying in space of transmitter and receiver
radiations. Principle of action is based on the change of level of the accepted signal from motion of violator between a transmitter and receiver.
For application means of discovery the system of parallel wires on that a transmission and reception of radiation come true is used. The change of level of the accepted signal from motion of violator near-by the system of wires results in delivery of signal "Alarm".
Magnetometer facilities of discovery is system of wires, sensible to the change of magnetic-field at moving through her metallic objects.

Seismic facilities of discovery are the system of the sensors set in soil. Principle of action is based on the seismic vibrations of soil, caused by a man at motion.
Optics facilities of discovery are set about a transmitter and receiver, forming
ray. Breaking of rays a violator results in the wearing-out of the system.




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