Metal tube structure-based fiber grating corrosion sensor and monitoring method thereof

Abstract

The invention relates to a metal tube structure-based fiber grating corrosion sensor and a monitoring method thereof, and belongs to the technical field of measurement. The sensor is used for monitoring the corrosion condition of a metal structure in acidic and alkaline environment. A making method of the sensor comprises the following steps: a sensing fiber grating penetrates through the inside of a metal tube, a certain size of pre-tension is applied to the sensing fiber grating, and two ends of the sensing fiber grating are respectively fixed to two ends of the metal tube; and one side of the sensing fiber grating is serially connected to a temperature compensating fiber grating, and the temperature compensating fiber grating is freely disposed in the metal tube to be in an unweighted state, and is positioned in a same temperature field together with the sensing fiber grating. The wall of the metal tube gradually becomes thin with the depth of the corrosion degree of the metal tube, so the compressed degree of the metal tube gradually increases, and the grating period of the fiber grating gradually decreases, thereby the center wavelength of the fiber grating gradually deflects. The strain response characteristic of the fiber grating sensor is combined to monitor the corrosion degree of the metal material.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an optical fiber grating sensor for monitoring the corrosion status of metal materials in aerospace structures, bridges and high-rise buildings. Background technique [0002] Metal corrosion is a long process, especially when it is approaching or exceeding its service life, it becomes particularly difficult to detect. What corrosion detection requires is to give some indications of corrosion conditions without damaging the metal structure, so as to facilitate early warning and maintenance. Cut your losses. Traditional corrosion monitoring methods, such as visual inspection, sampling and mechanical (mechanical) experiments, have disadvantages such as low reliability, damaged structures, and small monitoring areas. Fiber optic grating sensors have unique advantages such as high detection sensitivity, light weight, anti-interference, corrosion resistance, and remote measurement...

AI Technical Summary

Problems solved by technology

This kind of package is small in size, but the coating processing technology is relatively high, and it is limited to the thickness and uniformity of the cylindrical coating. Its measurement range and accuracy are limited, and it is not suitable for long-term corrosion monitoring.

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