An optical fiber perimeter security device and a method for determining an optical fiber perimeter intrusion signal
A fiber optic perimeter security and equipment technology, applied in anti-theft alarms, instruments, alarms, etc., can solve the problems that the optical fiber optical power is easily affected by various factors, cannot achieve positioning, and has low detection accuracy, achieving low cost, The effect of reducing false positives and reducing the false positive rate
Active Publication Date: 2017-08-25
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Problems solved by technology
Compared with several other methods, this method has the advantages of simple system architecture and low device cost; the disadvantage is that the optical power in the fiber is easily affected by various factors, the detection accuracy is low, and positioning cannot be achieved
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[0023] Such as figure 1 As shown in the figure, after the small defense zone equipment and the optical cable are laid, the signal processing modules A and B are connected through an optical fiber. When devices A and B are in the state of intrusion monitoring, modules A and B monitor the strength of the optical signal in the optical fiber. When an intrusion occurs, a typical intrusion signal is a signal in which the optical power changes suddenly. When modules A and B are in the state of intrusion monitoring, they identify the sudden change of optical power caused by intrusion by comparing the light intensity signals within a fixed period of time. Because modules A and B use the same device and algorithm to operate, it can be considered that the time required for modules A and B to detect and identify sudden changes in optical power is the same, which is defined as Tp (processing time).
[0024] When a certain position on the optical fiber is disturbed to generate an optical ...
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The invention relates to optical fiber peripheral security and protection equipment and a method for determining an optical fiber invasion signal. Two modules at two ends of an optical fiber independently process a light intensity signal in the optical fiber, and are used for optical fiber sensing. When a signal meets the warning conditions, the two modules transmit a group of coded digital signals mutually for the confirmation of an alarm event, and carries out recognition and determination through event characteristics in the digital signals. The difference of distances between an event point and the two modules is obtained through calculation, thereby achieving the positioning of the event. Through the analysis of the optical signal in the optical fiber, the method achieves the determination of the peripheral invasion event, and confirms the happening device of the peripheral invasion event through the calculation of transmission time of the optical signal. The method achieves the bidirectional reuse and simulation of the optical fiber and the reuse of the digital signal transmission. If a signal is determined by the two modules at the same time to be an invasion signal, the signal is taken as an effective invasion signal, thereby reducing the false alarm rate. Moreover, because of the reuse of the device and an optical cable, the cost of a system is greatly reduced.
Description
technical field [0001] The present invention relates to an optical fiber perimeter security device and a method for determining intrusion signals at the perimeter of an optical fiber, in particular to a single-fiber bidirectional and analog and digital signal transmission multiplexing technical means to realize low-cost defense zone positioning and low false alarm rate Fiber optic sensing devices. Background technique [0002] Due to its strong anti-electromagnetic interference, good concealment, non-radiation anti-detection, and long maintenance cycle, optical fiber sensing technology is increasingly used in fields such as ports, banks, airports, and military stations that require high confidentiality and a wide range of protection. important role. [0003] There are many ways to realize the perimeter security system based on optical fiber sensing, including: optical power measurement method, mode spot recognition method, optical time domain reflection method, phase detect...
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IPC IPC(8): G08B13/181
CPCG08B13/181
Inventor茅昕夏涛廖招龙水彪
OwnerYANGTZE OPTICAL FIBRE & CABLE CO LTD