Subway buried metal pipeline corrosion optical fiber monitoring device and method

Abstract

The invention relates to a subway buried metal pipeline corrosion optical fiber monitoring device and method. The monitoring device comprises an excitation unit, a sensing unit, a pre-tightening unit, a supporting unit and a control unit. The subway metal pipeline corrosion monitoring method specifically comprises steps that the excitation unit outputs excitation current from one end of a buried metal pipeline to the other end of the buried metal pipeline; a magnetic field generated by excitation of the excitation current is conducted to the pre-tightened magnetostrictive composite material along a magnetizer of the sensing unit, so the magnetostrictive composite material deforms and causes the fiber bragg grating adhered to the magnetostrictive composite material to generate proportional deformation, and the fiber bragg grating transmits a deformation signal to the control unit; the control unit calculates to obtain the circulating current on the metal pipeline at the position where the sensing unit is arranged, and when the excitation current values monitored by two adjacent sensing units are different and the difference value exceeds a set threshold value, the control unit considers that the metal pipeline between the two sensing units is corroded and gives an alarm.

Description

technical field [0001] The invention relates to corrosion monitoring of buried metal pipelines in subways, in particular to an optical fiber monitoring device and method for corrosion of buried metal pipelines in subways. Background technique [0002] At present, most of the subway power supply system adopts the DC traction power supply mode. The subway locomotive obtains the traction current from the traction substation through the catenary, and the traction current returns to the traction substation along the running track. With the increase of the operation time of the subway, the subway running track and The insulation performance between ballast beds is gradually reduced, and part of the traction current will leak from the running rail to the surrounding medium, forming stray current. Stray current will not only cause electrochemical corrosion to the steel structure of the main body of the subway system, but also cause corrosion hazards to the buried metal pipelines of ...

AI Technical Summary

Problems solved by technology

Stray current will not only cause electrochemical corrosion to the steel structure of the main body of the subway system, but also cause corrosion hazards to the buried metal pipelines of the subway, which will reduce the service life and durability of the buried metal pipelines, and in severe cases will cause catastrophic consequences , because buried metal pipelines are usually deep underground and in a humid and corrosive environment all year round, there are currently few reliable and accurate online methods for corrosion monitoring of buried metal pipelines

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