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Simplified design of fiber optic systems for protection of perimeters based on controlling additional losses in the OF with locating sensors in zones.
Source publication
This article deals with the problem of ensuring protection of limited access objects and other objects of state significance from unauthorized access. There is given the analysis of systems already developed by Russian and foreign scientists. A passive perimeter security system is proposed for consideration the main element of which is an optical f...
Contexts in source publication
Context 1
... practice, the design shown in Figure 4 is implemented as follows. From the coherent radiation source, which is semiconductor laser 1, through optical splitter 2, light is supplied through the OF of communication cable 3 to each of zones from I to Nx, within 60 channels. ...
Context 2
... light transmitted through the sensor is returned through the return fiber and gets to photodetector 6, then light waves are converted into an electrical signal in processing device 7. Computer 8 is used for data processing, as well as storage and visualization of the information. Sensors can be located on the fence or on the plastic mesh in a shallow trench (Figure 4). Under any mechanical action on the fence and, accordingly, on the sensor, the properties of the light passing through the sensor change, additional losses and a change in the headlights of the light wave occur, which is captured by the photodetector. ...
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Citations
... DFOS system uses optical fiber as sensing element to detect changes in the surrounding environment, such as temperature and applied mechanical stresses [1][2][3]. Particularly fiber-optical distributed acoustic sensing (DAS) systems are useful for facility security because it can detect and locate potential threats, such as unauthorized access [4,5]. DFOS systems are also flexible and can be customized to meet specific security needs. ...
