Intrusion detection method and related equipment for optical fiber perimeter security system

A fiber optic perimeter security and intrusion detection technology, which is applied in anti-theft alarm mechanical activation, alarms that rely on broken/disturbed straightened ropes/metal wires, etc., can solve the problems of light intensity changes affecting vibration intensity signal extraction, etc. Achieve the effects of improving the scope of application, wide adaptability, and simple calculation

Active Publication Date: 2022-04-08
CHINA NAT CHEM COMM CONSTR GRP CO LTD +2
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Problems solved by technology

[0004] In view of this, the purpose of one or more embodiments of this specification is to propose an intrusion detection method and related equipment for an optical fiber perimeter security system to solve the problem that the change of light intensity affects the extraction of vibration intensity signals

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  • Intrusion detection method and related equipment for optical fiber perimeter security system
  • Intrusion detection method and related equipment for optical fiber perimeter security system
  • Intrusion detection method and related equipment for optical fiber perimeter security system

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Embodiment Construction

[0039] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0040]It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of the present specification shall have ordinary meanings understood by those skilled in the art to which the present disclosure belongs. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0041] As mentioned in the background art section, with the continuous ...

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Abstract

One or more embodiments of this specification provide an intrusion detection method for an optical fiber perimeter security system, including: acquiring the voltage signal sequence of the optical fiber vibration sensing optical path of the optical fiber perimeter security system; calculating the vibration signal sequence according to the voltage signal sequence Intensity: A threshold is set based on predetermined rules, and a vibration signal exceeding the threshold is determined as an intrusion signal. The intrusion detection method of the present invention analyzes the vibration signal through the weighted average of the multi-threshold threshold crossing rate combined with the visibility of the interference signal, avoiding the problem of poor accuracy of single threshold crossing rate analysis. In the process of intrusion detection, the security system does not need to modulate the laser or introduce additional devices, and the detection method is simple, fast and accurate, which improves the scope of application of the system.

Description

technical field [0001] One or more embodiments of this specification relate to the field of optical fiber security technologies, and in particular to an intrusion detection method and related equipment for an optical fiber perimeter security system. Background technique [0002] The interferometric optical fiber sensor has the advantages of high sensitivity and dynamic range, and uses optical fiber as the sensing and transmission unit, which is not easily affected by electromagnetic interference. The common interferometric fiber optic sensor adopts a double-beam interferometer structure for measuring vibration and sound, and is widely used in the field of perimeter security. By monitoring various vibration signals on the optical cable to trigger alarms, real-time warning of intrusion and crossing behaviors in the perimeter, it is widely used in perimeter defense in airports, prisons, schools, factories, and high-end communities. [0003] At present, most fiber optic perimet...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B13/12
CPCG08B13/12
Inventor 王向刚张华勇李光岳李新
Owner CHINA NAT CHEM COMM CONSTR GRP CO LTD
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