Optical fiber distributed disturbance sensing method with disturbance property identification function and system thereof

Abstract

The invention relates to an optical fiber distributed disturbance sensing method with disturbance property identification function. Based on double Mach-Zehnder interference type distributed disturbance sensor, the method comprises the following steps of: S1, carrying out analogue-to-digital conversion to two signals acquired by two photoelectric detectors of the double Mach-Zehnder interference type distributed disturbance sensor to obtain digital quantity signals; S2, carrying out wavelet multi-scale decomposition to the two digital quantity signals, and extracting characteristic components; S3, comparing the extracted characteristic components with a threshold value to determine what to cause disturbance; if judging that the disturbance is caused by outside noise, not giving an alarm; if judging that the disturbance is caused by outside invasion, giving an alarm, and going to step S4; S4, carrying out noise reduction to the two signals; S5, carrying out reverse wavelet transform to the two signals after noise reduction for reconfiguration to obtain recovered original signals; and S6, carrying out related operation to the two recovered original signals to obtain disturbance position, and displaying.

Description

Technical field [0001] The invention relates to the technical field of photoelectric sensing, in particular to an optical fiber distributed disturbance sensing method and system with disturbance property recognition function. Background technique [0002] Perimeter security systems have very important applications in national defense, civil and engineering fields. Its defense applications mainly include border intrusion monitoring on border lines, military bases, military factories, military airports, military warehouses, oil depots, and barracks; its civilian applications mainly include government facilities, airports, nuclear power plants, reservoirs, large dams, chemical plants, Perimeter intrusion monitoring in important areas such as prisons. [0003] At present, a variety of perimeter security systems based on different principles have been developed, such as absorbing cables, microwave radiation, infrared radiation, and optical fiber sensing technologies. Among them, optic...

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Problems solved by technology

[0014] In order to solve the problem of false alarms existing in the current fiber optic fence system under external interference and the problem of decreased positioning accuracy of the fiber optic fence system under complex background noise, it is necessary to identify the nature of the disturbance signal caused by different events and make an accurate intrusion alarm. Judgment, finally achieve low false alarm rate, and must carry out noise reduction processing on the collected signal, improve the signal-to-noise ratio of the collected signal, and then improve the positioning accuracy of the system, the present invention proposes a fiber optic distributed disturbance transmission sense method and system

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