Shake monitoring system based on Brillouin distributed optical fiber sensing

Abstract

A shaking monitoring system based on Brillouin distributed optical fiber sensing belongs to the technical field of overhead cable safety monitoring. The system includes a temperature and strain monitoring device based on Brillouin optical time domain analysis, which is composed of a semiconductor laser, an optical coupler, an electro-optic modulator, an acousto-optic modulator, a microwave frequency sweeper, a photodetector, and a data acquisition card. A number of shake sensors consisting of rotating rods and counterweights. The shaking sensor is installed at each fault-prone point of the cable. When the cable shakes, the rotating rod connected to one end of the optical fiber drives the counterweight to swing around the optical fiber. Due to centrifugal action, the rotating rod drives the optical fiber it surrounds to produce bending strain, and the shaking state can be transformed. The bending strain of the fiber is detected by the Brillouin temperature and strain monitoring device. The invention is suitable for on-line monitoring of the swaying state and temperature of overhead cables, can realize long-distance and distributed measurement, is practical, flexible in layout, and effectively realizes cable safety monitoring.

Description

technical field [0001] The invention relates to a system for monitoring the sway state of overhead cables, in particular to a sway monitoring system based on distributed optical fiber sensing based on Brillouin optical time domain analysis. The invention belongs to the technical field of safety monitoring of aerial cables. Background technique [0002] With the sustained and rapid development of the national economy, the use of overhead cables is also increasing. It is widely used in public facilities, large enterprises, etc., and provides source power for the development of production, life, education, and military affairs in the entire society. Because of this, we put forward higher and higher requirements for the safety and stability of the power system. At present, the safety monitoring of cables in the world is still mainly at the temperature level. From the previous temperature-sensing cable-type temperature measurement and thermistor-type temperature measurement syst...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that neither the existing cable safety monitoring system nor the traditional Brillouin distributed optical fiber sensor can directly monitor the cable shaking state, and a designed A sloshing monitoring system based on Brillouin distributed optical fiber sensing that can simultaneously monitor temperature and sloshing state

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