Monitoring system for real-time displaying running state of subway

Abstract

A monitoring system for real-time displaying the metro running state includes optical fibre and optical time-domain reflectometer (OTDR), in which the optical time-domain reflectometer is connected with an arbitrary end of optical fibre, it also includes mechanical motion transducer mechanisms, and the described mechanical motion transducer mechanisms are distributed on the optical fibre according to a certain density. Said invention is simple in structure, convenient for installation, low in cost, can simultaneously implement several monitoring functions, and possesses high environmental adaptability, and has no need of routine maintenance.

Description

technical field [0001] The invention relates to the technical field of automation, in particular to a monitoring system that uses optical fiber sensing technology to display the running state of a subway in real time. Background technique [0002] At present, the monitoring of the train's running position and speed in the subway is realized through the track circuit. The so-called track circuit is a circuit composed of rails as the carrier of information transmission. When the train is running, the contact between the axle and the track will affect the parameters of the track circuit. By calculating and processing the signals of each track circuit, it is determined whether the corresponding track section is Occupied. figure 1 It is a block diagram of the existing track circuit. This is a typical distributed working mode. Each section of the track circuit is equipped with an independent signal sending circuit and receiving circuit, collectively referred to as track circuit ...

AI Technical Summary

Problems solved by technology

[0003] (1) The structure of the circuit equipment is huge and complicated, it is inconvenient to install and maintain, and the cost is expensive;

[0004] (2) Since electronic and electrical components work in a harsh environment for a long time, frequent maintenance and repairs are required to ensure reliability, and usually need to be replaced every few months;

[0005] (3) The electromagnetic interference caused by the strong train traction current seriously affects the reliability of its action;

[0006] (4) There is serious mutual interference between each section of the track circuit, which affects the reliability of its operation;

[0007] (5) It can only determine whether a certain section of track is occupied, but cannot accurately measure the position and speed of the train

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