A calibration method and perimeter alarm device

Abstract

The invention discloses a calibration method and a perimeter alarm device. The method is used in the perimeter alarm device. The perimeter alarm device is provided with a light source emitter, an optical circulator, a signal detector and a data collector, wherein the The optical circulator is connected to the light source transmitter and the detector through an external optical fiber, and the calibration method includes: after the initialization is completed, controlling the light source transmitter to transmit light pulses to the optical fiber; controlling the data collector to use T The time is the periodic collection of the backscattering signal received by the signal detector; whether the backscattering signal is detected to be stable; if the backscattering signal is stable, then calculate the K times of the cycle T time on the optical fiber A static threshold corresponding to the position point, where K≥2; storing the static threshold to form a calibration sample database. It has the advantages of low cost and simple structure, and can self-correct the loss of the optical fiber and the interference caused by bending or compression.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a calibration method and a perimeter alarm device. Background technique [0002] The fiber optic perimeter defense system is also called the perimeter alarm system. It uses fiber optic sensors to perceive changes in external signals, and conducts real-time online monitoring of various disturbances that directly affect the fiber or loads, such as soil or fences, and are transmitted to the fiber. monitor. The collected disturbance data is analyzed and processed by the host and intelligently identified to determine different external disturbances, including climbing fences, walls, walking, excavation in fortified areas, and loads that may threaten optical fibers, etc., to achieve system early warning or real-time alarm , positioning, so as to achieve the purpose of early warning and monitoring of threat behaviors intruding into the perimeter of the fortified area and ...

AI Technical Summary

Problems solved by technology

[0005] However, in the actual application process, the types of optical fibers are different, the fusion splicing process of optical fibers is different, or the actual engineering installation process has different degrees of compression on the optical fiber for fixed purposes, causing loss at these local compression points, which will affect the alarm of the perimeter alarm system accuracy of results

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