TECHNICAL DESCRIPTION - FIBRE OPTIC PERIMETER SECURITY SYSTEM

THE MICMAR FOSE PLUS FIBRE OPTIC PERIMETER SECURITY SYSTEM
The MICMAR FOSE PLUS fibre optic perimeter security system is a patented perimeter security system, active 24 hours a day, which gives complete protection from any intrusion, even remaining inside the protected area.
MICMAR uses the fibre optic both as a sensor and as the transmitter of the alarm signal. The fibre optic, being glass, transmits not an electric signal but light and therefore guarantees a 100 % success rate for the alarm.
This is why the MICMAR system is not disturbed by any weather conditions (hail, storms, fog, sun, rain), nor by the wind (it does not represent a sail effect), nor does it resent radio or electromagnetic interference caused by the presence of high tension cables, radio or radar communication, traffic or any other kind of vibration.
Finally not even birds will cause false alarms for the system, because of the software control unit, it eliminates all the spikes of the optic stress and reads all the time an average of the signals coming from the fibre optic installed along the perimeter.
THE USER OF THE MICMAR FIBRE OPTIC SYSTEM
The system allows a vast range of flexibility in its usage. It can be used both in the defence of very limited areas (terraces, roofs, etc.), or in perimeters many kilometres long. Therefore there is no standard user of the system as the system can be customized for the owner of an apartment or villa, to the military or public institutions.
AN ECONOMIC SYSTEM
The cost of the MICMAR perimeter system is situated in a medium to low range cost compared to other traditional perimeter systems.
The degree of security and the cost of the system varies depending on the number of optic cables that are used and how these are installed. Other factors are the number of alarm zones and their lengths as well.
You must also take into consideration that the maintenance cost of the fibre optic perimeter system is practically non-existent. In fact, after it has been installed no setting will be necessary from an electronic and mechanical point of view.
Given the 100% success rate of the alarm signal, all the problems of false alarms, that other perimeter systems have, are avoided.
THE ELEMENTS THAT FORM THE SYSTEM

 

  • FOSE PLUS microprocessor control unit.
  • Optic protection on the field.
  • Brackets/poles to support the optic cables of the system.
  • Fibre optic cables connecting the microprocessor control unit and the alarm zones.
CONTROL UNIT FOSE PLUS
FOSE (Fibre Optic Supervisory Equipment) is a control unit designed to handle the fibre optic perimeter security system.
Its extraordinary flexibility makes it possible that, if necessary, it can also be used as a sub control unit within a more complex system and be controlled from a supervision system. In its greatest capacity the control unit can handle 6,000 – 7,000 m of fibre for each alarm zone.
The case consist of a painted steel box opening from the front, its dimension being 400 x 300 x 120 mm. The entries for the optic cables coming from the perimeter consist of slots on both the lower and the upper parts of the box. All relevant information about the condition of the installation, both in use as during the programming, is indicated in a liquid crystal display with 16 symbols positioned on the upper part at the front. The programming is done using the 16 symbol keyboard. The inside contains an electronic board, the optic transreceiver apparatus and the power supply. The main characteristics of the electronic board are: 8 optic outputs (where are positioned the optic transmitters), 8 traditional optic inputs (where are positioned the optic receivers), 9 power relays (1 for each individual channel + 1 general one), 1 key input, 1 serial output RS 232 (for links with PC, printers, etc.), max. feeding of 1A for external apparatus.
The optic transreceiver apparatuses consist of a transmitter, that emits light to the inside of the fibre optic loop, positioned on the external perimeter and a receiver that receives the light emitted by the transmitter at a determined power.
If the amount of light transmitted is different to the normal level, then the receiver sensors this change and the software reads it as an alarm.
The change in the power of the light between TX and RX is due to a mechanical intervention (stress) of the optomechanical attenuator and of the optic switch on the fibre optic positioned around the perimeter. This causes an attenuation of the optic signal.
The intervention of the optomechanical attenuator and of the optic switch occurs only when physical aggression is done to the intrusion prevention and climbing-over prevention optic cables.
There are no false alarms caused by bad weather, magnetic and electrical fields, radio frequencies and disturbances, vibrations of whatever type.
The working voltage is of 10-14 Vdc.
The programming of the control unit is extremely important for the good working order of the installation as it is the control unit that regulates the sensibility (sector by sector) of the system as regarding an intrusion.
After entering the programming with a password the following operations can be carried out:
INSERTION PROGRAM: is used for the insertion and disconnection of the individual sectors in a swift method that does not alter their programming.
CLOCK PROGRAM: For bringing the calendar up to date.
ALARM TO ZERO PROGRAM: Possibility to recommence count of alarms. The memory capacity is of 200 events.
GENERAL DURATION PROGRAM: Exchange time of general relay.
CANALS OF ALARM PROGRAM: With the programming of the canals you determine the type of input (disconnected, optic, electric, anti tampering), the delay of the input, the delay of the output, the duration of the alarm of one single sector, the numerical average reading of the optic signal and the sensibility.
The parameter “numerical average” creates a reading of the optic signal that is not instantaneous but diluted over a certain period of time, therefore avoiding any spike readings that would create false alarms.
PIN NUMBER PROGRAM: A 4 figures pin number in your personalisation.
ALARM FILE: Reading of all the alarms that have taken place.
OPTIC PROTECTION ON THE FIELD

The intrusion prevention and climbing-over prevention systems are installed on the existing perimeter boundary. The number of optic cables and their positioning is decided upon the degree of security that is wanted and upon the type of perimetric boundary that is already on existence.
The most common types of system installed are:

  • Climbing over prevention system with 4 fibre optic
  • Climbing over prevention system with 6 fibre optic
  • Intrusion prevention system with 4 fibre optic
  • Intrusion prevention system with 6 fibre optic
  • Climbing over with 2 f. o. and intrusion prevention system with 4 f .o.
  • Climbing over with 4 f. o. and intrusion prevention system with 4 f. o.

The causes for which the MICMAR system will alarm are the cutting of a sensorproof cable and/or the stress of it. By “stress” of the cable we mean something mechanical (sensor unit) that affects the cable, thus lowering the amount of light that goes into it. This type of stress may be caused by the stretching of the cable with something or someone trying to pass in between, by an attempt to climb over the cables, by leaning a ladder on the cables or by an attempt to tamper or open the sensor units.
The single components of the protection on the field are:

  • Special sensor cable “SENSORPROOF”.
  • Sensor unit
  • Clamping assembly.

 

The SENSORPROOF cable is produced with a particular procedure (THERMOLOCKED) for its good working order, on the inside of sensor unit.
Sensorproof is made of multimode fibre optic, aramidic yarns and an outer polyurethane sheath.
The cable is supplied in coils linked at the edges with ST connectors. These connectors are mechanical parts that, by way of a through bush (connector female/female), allow to join more sensorproof cable coils to themselves.
The sensor unit is a mechanism in plastic material that allows the taut cable system to have the same sensitivity along its entire length.
It acts on the fibre optic cable and multiplies the pressure exerted when trying to climb over the barrier (alarm upon the stretching of the cables).
They are situated on the brackets or on the poles that hold the taut cables with suitable joints.
Alternatively a clamping assembly is installed to the sensor unit (one bracket yes and one bracket no) which allows the blocking of the sensorproof cable over the support brackets/poles.

SUPPORT BRACKETS/POLES OF THE TAUT CABLE SYSTEM
These are the metal structures made to support the sensorproof optic cable and hold within them the sensor units and the clamping assemblies. They are made of aluminium EN AW 6060 anodised with anti-torsion ribbing and fins for supporting clamping assemblies and sensor units. The height of the brackets or the poles varies according to the number of taut optic cables. These can be positioned at intervals of 10, 15 cm. Normally in high climbing over risk areas the taut cables are brought closer to each other. The climbing over prevention brackets can be placed on the highest point of the wall or wire fence (ideal space 2,5 m) or on the poles of an already existing fence. In this case the number of brackets will be equal to the number of poles on the fence.
FIBRE OPTIC CABLES LINKING THE CONTROL UNIT AND THE ALARM ZONE

These cables sold by measure and preconnected, they are used in case of long distance between the control unit and the perimeter, or if the alarm zones in which the perimeter has been divided are more than two. As previously explained, every Fose Plus can handle 8 alarm zones. The number of alarm zones chosen and their length depends on the immediacy of the intervention of any guards that may be obtained, on the presence of video surveillance systems and, of course, depending on the expenditure budget at disposal.
For perimeters with a length of about 3.000 m, the MICMAR system could work without electric or electronic units positioned on the field and all the signals coming from the perimeter system are transported via multiple fibre optic cables to the control unit.

 

SISTEMA PERIMETRALE DI SICUREZZA A FIBRE OTTICHE MICMAR FOSE PLUS
BLOCK PATTERN N° 1
The multiple fibre connection cables are made of n° 2,4,6 fibre optics.
Draft example of the use of the cables:
Perimeter length: m 1.000
Alarme zones: n° 8
Length of single zone : m 125
SISTEMA PERIMETRALE DI SICUREZZA A FIBRE OTTICHE MICMAR FOSE PLUS
BLOCK PATTERN N° 2
As can be seen in block pattern n° 2, every zone is served by at least 2 fibre optics coming from the control unit with a decreasing fibre number.
In the example taken from the nearest point of the control unit (and easily accessible) to the perimeter 2 cables with 2 fibres and 2 cables with 6 fibres are stretched out.
At that point when zones 1 and 8 start, 2 fibre optics are used for each zone, therefore along zones 1 and 8 the cable will be of 6 fibre optics and so on.
As has already been explained, if the perimeter is only 1 or 2 alarm zones there is no need for connecting optic cables, and it is possible to return to the control unit closing the optic loop, with the same sensorproof cable.
This is only, if the distance between the Fose Plus control unit and the start of the perimeter is less than 50 m. If the distance is greater then from a financial point of view it is advisable to use cables with 2 or 4 fibre optics.

 

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