Online railway monitoring system and method based on distributed acoustics sensor

Abstract

The invention discloses an online railway monitoring system and method based on a distributed acoustics sensor. The system comprises a laser generator, a circulator, the distributed acoustic sensor, asignal receiver and a signal processor, wherein the laser generator is used for emitting a pulse detection light signal, a first end of the circulator is connected with an output end of the laser generator and is used for realizing signal one-way transmission, a signal end of the distributed acoustic sensor is connected with a second end of the circulator and is used for changing scattering characteristics under the excitation of an acoustic signal, modulating the pulse detection light signal transmitted by the circulator and outputting back Rayleigh scattering light through the backscattering effect, an input end of the signal receiver is connected with a third end of the circulator for converting the back Rayleigh scattering light into an electrical signal, and an input end of the signal processor is connected with an output end of the signal receiver for realizing demodulation processing of the electrical signal and determining the abnormal information of a rail and the informationof entered foreign matters based on the demodulated signal. The system is advantaged in that multiple types of monitoring reuses are realized.

Description

technical field [0001] The invention belongs to the field of distributed acoustic wave optical fiber sensing, and more specifically relates to an online railway monitoring system and method based on distributed acoustic sensors. Background technique [0002] China is a big country of railways, and accidents in railway transportation also happen from time to time. One kind of accident is due to abnormal conditions of the rails, such as broken rails, rail settlement, wear, etc. Such abnormalities will cause the train to shake if it is light, and it will make the train shake if it is serious. The derailment of the train endangers the safety of people and property; another kind of accident is due to the entry of foreign objects along the railway, such as falling rocks, mudslides, or even people or animals who stray into the railway, causing casualties or property damage. [0003] At present, for the detection of rail anomalies, ultrasonic detection or image recognition methods a...

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Problems solved by technology

[0006] In order to solve the above problems, the present invention proposes an online railway monitoring system and method based on distributed acoustic sensors, which aims to solve the problem that the existing online railway monitoring system cannot simultaneously realize foreign object entry due to the use of different methods to detect foreign object entry and rail abnormality Technical Issues in Inspection and Track Anomaly Detection

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