DE4023895A1 - Device for laying cables around area under surveillance - comprises reel of optical cable with tapered and grooved core for attachment to body of projectile - Google Patents

Abstract

Pressure-sensitive cables (2) are laid for effective coverage of the area around a protected installation by unwinding from the conical core (7) of a reel (8) in a housing (10) fixed to a projectile (6). Each cable (2) embodies two optical waveguides in a common sheath with a splice at the end. To prevent excessive traction on the cable (2) at the firing of the projectile (6), a spiral groove (11) is formed in the surface of the cone (7) pref. terminating at its small-dia. end. USE - At e.g. airfields, power stations, business premises, barracks and other military installations.

Description

The invention relates to a device for Recording and relocating one of the surveillance of a Terrain serving, pressure sensitive line, which in Working position at a monitoring device can be connected.

The surveillance of larger areas is often over Security reasons desired or required. Such There is space for example at airports, Power plants, company premises, barracks and others military areas. The surveillance is said to be very can be quickly identified if an unauthorized person or a vehicle enters the monitored area or drives and at which point this happens. In doing so at least one display is made in a central office or alarm can also be triggered.

Known monitoring devices work for example with television cameras, with light barriers, with microwave links, by means of radio frequency or inductive. A disadvantage of these devices is there too see that the respective monitoring routes of this volumetric devices physically no obstacle represent and can therefore be overcome quickly. This disadvantage is with a fence according to the DE-OS 37 40 113 not available because the fence itself  Obstacle is that only with some time is overcome. As sensors are in the fence Piezoelectric leads attached. The effort for Creation of the fence including sensors substantial and justified only where for a certain area permanently high security requirements be put.

The invention has for its object a Specify device with which to monitor a Certain line laid in a simple way can be.

This task is the beginning of a device solved in accordance with the invention,

• - That the at least one optical fiber having line on a conical core as releasable coil is wound,
• - That the line inside the coil with at least a turn around the core it is determined
• - That at rest on the core Coil firmly with a drivable missile is connected and
• - That the core on the side facing away from the missile Side is designed so that it is at a fixed Device to be fastened.

The pressure-sensitive line provided as a sensor with at least one optical fiber - in the following briefly Called "LWL" - is one of the size of the coil dependent length attached to the missile. With that from a stationary base of movement Pulled the line from the coil or out of the same pulled out because the coil is attached to the missile, while the line to the stationary core remaining is set. The line is stretched Relocated to the site. The pressure sensitivity of the in  The fiber contained in the line is removed by subtracting the coil and the twisting that occurs Line increased. This is of particular advantage Device that the spool from the moment of winding up at the start of the missile stays on the core, so that acts as a support body. The turns of the line in the Therefore, the coil does not need to be particularly tightly wound by pulling the line from or out of the Coil is facilitated. On the other hand is through the core also ensured that the turns of the Line inside the coil during storage and especially when transporting the device not from the Can loosen the coil. The core remains in the coil brings the further advantage that the device Easily attached to a device via the core from which the missile is launched.

Advantageous embodiments of the invention are shown in the Sub-claims emerge.

Embodiments of the subject matter of the invention are in shown the drawings.

Show it:

Fig. 1 in a schematic representation of a site equipped with sensors.

Fig. 2 and 3, portions of a line used as a sensor in two different embodiments.

Fig. 4 also partially in schematic representation of a device according to the invention.

Fig. 5 shows the device in a position suitable for laying.

In Fig. 1, a base 1 is shown, from which several lines 2 originate. The lines 2 are arranged so that they cover the area surrounding the base 1 as evenly as possible. They are designed to be pressure-sensitive and are connected at their end lying in the base 1 to a monitoring device which is known in principle and is therefore not shown. Such a monitoring device can be arranged on the base 1 or in a control center which is connected to the base 1 .

According to FIG. 2, a line 2 has two optical fibers 3 , which are arranged in a common sheath 4 . At the free end of line 2 , the two optical fibers 3 are connected to one another at the splice point 5 . This structure has the advantage that the line 2 can be made in any length and then cut to the desired length. The two fiber optic cables 3 then only need to be freed from the layer surrounding them and welded to one another on the end face. In order to prevent damage to the fiber optic cable 3 after splicing and during transport of the device, they are bent and fixed in the area of the splice point 5 with a relatively large radius. The two fiber optic cables 3 can be stranded together in line 2 . In the line 2 which acts as a sensor, one optical fiber 3 is connected to a light-emitting transmitter S, while the other optical fiber 3 is connected to a receiver E.

If the line 2 according to FIG. 3 has only one optical fiber 3 , then the same is terminated at its free end with a reflection unit R, through which the light fed in by the transmitter S is reflected as totally as possible. Here, the receiver E is connected to the FO 3 via a coupler K.

To easily lay the line 2 , which has a length of 100 m, for example, in the field, a missile 6 to be launched from the base 1 is expediently used. For this purpose, the line 2 is wound on a conical core 7 to a coil 8 in full length. The coil 8 is firmly connected to the missile 6 , the splice 5 including the curved fiber optic 3 or the reflection unit R can be fixed separately on the missile 6 , as is shown schematically in FIGS. 2 and 3.

The core 7 is detachably mounted in the coil 8 . It remains in the same after completion of the coil 8 as long as the coil 8 is stored and transported with the missile 6 attached to it. The core 7 remaining in the coil 8 ensures that the inner turns of the line 2 cannot fall out. The core 7 is also an assembly aid when fixing the missile 6 to the coil 8 and it can also be used to attach the coil 8 with the missile 6 attached to it for launching on a stationary device 8 . The coil 8 is enclosed by a housing 10 which is fastened to the missile 6 and has a passage opening for the core 7 . The coil 8 is thus attached to the missile 6 via the housing 10 .

The missile 6 is preferably equipped in the manner of a rocket with its own drive. It starts in the position shown in FIG. 4 from the device 9 in the direction of the arrow P. The core 7 remains on the device 9 while the coil 8 with its housing 10 is carried by the missile 6 . During its movement, the line 2 is withdrawn from the coil 8 . When the line 2 is completely unwound, the missile 6 is stopped. It could then be released from line 2 . In order to prevent damage to the optical fiber 3 , the missile 6 preferably remains connected to the line 2 .

So that no excessive pull is exerted on the line 2 when the missile 6 is launched, the line 2 is secured to the core in at least one turn around the core 7 . For this purpose, the core 7 can be provided with a helically extending groove 11 for receiving the line 2 . The groove 11 preferably ends at the tip of the core 7 which has the smaller diameter.

When laying the line 2 out of the coil 8 moved with the missile 6 , the line 2 is rotated about its longitudinal axis. The pressure sensitivity of the line 2 or of the fiber optic cable 3 contained therein is thereby increased. In the event of a load on a person or a vehicle, the damping of the optical fiber 3 is increased so that the reduced intensity of the light arriving via the receiver E in the monitoring device leads to the triggering of a signal or an alarm.

Claims (6)

1. Device for receiving and laying a pressure-sensitive line which serves to monitor a site and can be connected to a monitoring device in the working position, characterized in that

• - That the at least one optical waveguide ( 3 ) having line ( 2 ) is wound on a conical core ( 7 ) as a releasable coil ( 8 ),
• - That the line ( 2 ) inside the coil ( 8 ) with at least one winding around the core ( 7 ) is fixed to the same,
• - That the in the rest position on the core ( 7 ) coil ( 8 ) is firmly connected to a drivable missile ( 6 ) and
• - That the core ( 7 ) on the side facing away from the missile ( 6 ) is designed so that it is to be attached to a stationary device ( 9 ).

2. Device according to claim 1, characterized in that the line ( 2 ) inside the coil ( 8 ) in a helically extending groove ( 10 ) of the core ( 7 ) is attached. 3. Apparatus according to claim 1 or 2, characterized in that the line ( 2 ) has two optical fibers ( 3 ) which are connected together at their free ends in a splice ( 5 ). 4. Device according to one of claims 1 to 3, characterized in that the two optical fibers ( 3 ) in the region of the splice ( 5 ) with a curved course on the missile ( 6 ) are fixed. 5. Device according to one of claims 1 to 4, characterized in that the two optical fibers ( 3 ) in the line ( 2 ) are stranded together. 6. The device according to claim 1 or 2, characterized in that the line has an optical waveguide ( 3 ) which is terminated at its free end with a reflection unit (R).