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, ЛЭП, 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). Principleofactionisbasedonthevibrationsoflinenofprotectionatclimbingoverordoingofopening. 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 ЧЭ 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 СВЧ
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 facilitiesofdiscoveryarethesystemoftheгеофонныхsensors setinsoil. Principleofactionisbasedontheseismicvibrationsofsoil,
Optics facilitiesofdiscoveryaresetaboutatransmitterandreceiver, formingИКray. Breakingofraysaviolatorresultsinthewearing-outofthesystem.