Novel multichannel distributed disturbance sensing system

Abstract

The invention provides a novel multichannel distributed disturbance sensing system. Aiming at the characteristics of a distributed disturbance sensing system based on an optical time domain reflectometer, simultaneously monitoring of multiple areas and multiple lines is realized by extending multiple channels through an optical switch on the basis of not increasing the cost of the sensing system; meanwhile, the chain backup function on the multiple lines is realized. A micro controller is used for controlling the optical switch for realizing the circular switching of the multiple channels and also communicates with a serial port of an upper computer to realize the recognition of the multiple channels; a real-time self-diagnosis function, a positioning function and other functions of cable-breaking faults are achieved by using an optical time domain signal of the system; after the cable-breaking faults appear, the micro controller is used for realizing automatic start of a backup chain and realizing online uninterrupted monitoring and protection of the multiple lines and multiple defence areas with a chain fault diagnosing function and a chain backup function.

Description

Technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing, and specifically relates to a novel multi-channel distributed disturbance sensing system with multi-channel control, link fault diagnosis and backup link self-activation. Background technique [0002] Distributed disturbance sensing system based on optical time domain reflection technology usually consists of three parts: monitoring optical cable, demodulation equipment and central processing unit. The sensing mechanism of optical time domain reflection is used to directly contact the optical fiber or through the bearing object such as soil. , Barbed wire, fences, etc., convert various disturbance signals such as vibration and strain on the transmission optical cable path into optical information, perform real-time reception, collection and intelligent analysis, processing and identification, and realize early warning and monitoring of threats in the perimeter of intrusion for...

AI Technical Summary

Problems solved by technology

At present, there is a multi-channel expansion method for the distributed temperature sensing system. The patent (CN201110264324) proposes that the upper computer is connected in parallel with multiple photoelectric modules through the bus interface, and multiple optical switches can be connected as needed to expand the system channel without considering system detection. time, but the structure of the system is complex, and there is no diagnosis, location and processing of faulty links in practical applications, and the inventive method is mainly aimed at distributed temperature sensing systems

[0004] In addition, once a broken cable fault occurs in the distributed disturbance sensing system during the monitoring process, it will lead to the failure of the defense in a large area behind the broken cable.

At present, cable breakage faults are usually determined by a special OTDR, but the OTDR responds slowly, and the disturbance monitoring needs to be suspended during the cable breakage diagnosis. How to realize fault diagnosis and location while disturbing the sensing, and realize the online uninterrupted monitoring of the system is the key An important issue that urgently needs to be resolved

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