Shake monitoring system based on Brillouin distributed optical fiber sensing

Abstract

The invention discloses a shake monitoring system based on Brillouin distributed optical fiber sensing and belongs to the technical field of overhead cable safety monitoring. The system comprises a temperature and strain monitoring device based on a Brillouin light time domain analysis, and a plurality of shake sensors, wherein the temperature and strain monitoring device is composed of a semiconductor laser, an optical coupler, an electric light modulator, an acousto-optic modulator, a microwave frequency sweep device, a photoelectric detector, a data collection card and the like; the shake sensors are composed of rotation rods and counterweight blocks; the shake sensors are installed on the fault-prone points of a cable; and when the cable is shaken, the rotation rods connected with one end of a fiber drive the counterweight blocks to swing around the fiber, under the centrifugal effects, the rotation rods drive the surrounded fiber to generate a bending strain, a shaking state can be converted into the bending strain of the fiber and thus be detected by the Brillouin temperature and strain monitoring device. The shake monitoring system based on Brillouin distributed optical fiber sensing is suitable for on-line monitoring of the shaking state and the temperature of an overhead cable, the long-distance and distributed measuring is realized, the practicality and feasibility are high, the laying is flexible, and the cable safety monitoring is effectively realized.

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...

AI Technical Summary

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

Images