Intrusion prevention system of fiber grating perimeter and alarm method thereof

Abstract

The invention provides an intrusion prevention system of fiber grating perimeter and an alarm method thereof; the system comprises a piece of on-site optical fiber detecting equipment and a piece of control equipment; the on-site optical fiber detecting equipment comprises detecting passages, and each detecting passage comprises cascaded optical fiber vibration detectors; the control equipment comprises a fiber grating signal demodulator and an alarm management computer, which are connected with each other; and the detecting passages are connected with the fiber grating signal demodulator. The alarm method comprises the steps of: firstly, updating a fiber grating wavelength reference value; and then, performing time domain processing on the wavelength sequences received by the fiber grating signal demodulator to distinguish the operation states of the optical fiber vibration detectors, and entering a pre-alarm state if the operation states of the detectors are normal and an abnormal signal is captured; and distinguishing the frequency domain of the wavelength information of the abnormal signal at the pre-alarm state, and retaining the effective illegal intrusion behavior information to finish the alarm process. The intrusion prevention system of the invention has the advantages of high sensitivity, good alarm performance and low false alarm rate.

Description

technical field [0001] The invention belongs to the technical field of optical fiber perimeter security, and relates to a data processing method and an alarm signal output process for an optical fiber grating perimeter anti-intrusion system. Background technique [0002] In recent years, with the rapid development of fiber Bragg grating sensing technology, perimeter security systems based on fiber Bragg grating vibration sensing technology are being used by more and more users. The fiber grating perimeter security system uses fiber grating vibration sensor as the sensing unit, and integrates multiple advanced technologies such as high-speed fiber grating wavelength demodulation, high-speed optical fiber communication, real-time video information display, modern digital signal processing and large-capacity data storage; The fiber optic perimeter security system can achieve precise addressing of illegal intrusions in a wide range, and has technical advantages such as on-site p...

AI Technical Summary

Problems solved by technology

However, it is precisely because of the high sensitivity advantages of fiber grating sensing technology that false alarms are prone to occur when the system is running in complex installation environments in reality, such as: strong winds, rainfall, vehicle operation, rail traffic, small animal activities, waves and tides and other factors can easily trigger the system to generate false alarms, thereby reducing the actual use effect of the system

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