High-speed rail overhead line system fault optical fiber detection device

Abstract

The invention discloses a high-speed rail overhead line system fault optical fiber detection device, and belongs to the technical field of distributed optical fibers. The technical problem to be solved is to provide the improvement of the hardware structure of the high-speed rail overhead line system fault optical fiber detection device. According to the technical scheme adopted for solving the technical problem, the device comprises an ultra-wideband light source which generates ultra-wideband laser light, and the ultra-wideband laser light enters a port a of a first optical fiber coupler; laser output by a port c of the first optical fiber coupler passes through the first phase shift fiber grating and then outputs narrow linewidth laser as an input light source of a phi-OTDR optical fiber vibration sensing system; laser output by a port b of the first optical fiber coupler passes through the broadband filter and then outputs broadband laser as an input light source of a Sagnac optical fiber vibration sensing system; the phi-OTDR optical fiber vibration sensing system and the Sagnac optical fiber vibration sensing system transmit input broadband laser through an optical path, convert the input broadband laser into electric signals and input the electric signals to the data acquisition and processing system. The device is applied to high-speed rail overhead line system fault detection.

Description

technical field [0001] The invention discloses a high-speed railway catenary fault optical fiber detection device, which belongs to the technical field of distributed optical fiber sensing. Background technique [0002] With the comprehensive popularization of high-speed railways in my country, the operation safety of high-speed trains puts forward higher requirements for high-speed railway catenary. The high-speed railway catenary is mainly used for the basic power supply of high-speed trains, and its common faults mainly include damage to basic components, damage to installation structural parts, damage to catenary wires, damage to auxiliary components such as suspension strings, and partial discharge caused by burnout of insulating devices, etc. , will produce obvious vibration signals to a certain extent. Therefore, vibration signal detection is an important means for fault detection of high-speed rail catenary, and the characteristics of long distance and strong electr...

AI Technical Summary

Problems solved by technology

Among them, the Sagnac interferometric optical fiber vibration sensing system is a typical forward optical sensing system. By using a broadband laser and using a 3×3 fiber coupler to achieve the interference of equal optical path lasers, the vibration can be realized. Fast restoration of the signal waveform, but its positioning performance is insufficient

As a typical backscattered light sensing system, the phase-sensitive optical time domain reflectometry (Φ-OTDR) optical fiber vibration sensing system uses a narrow linewidth laser and uses a 3×3 fiber coupler demodulation algorithm to realize the vibration signal Accurate positioning, but its waveform restoration frequency is limited

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