A metal surface corrosion monitoring device based on fiber grating with temperature compensation

Abstract

The invention discloses a metal surface corrosion monitoring device based on optical fiber grating with temperature compensation, which belongs to the field of optical fiber sensing technology and includes an L-shaped base, four optical fiber Bragg grating sensors symmetrically installed on both sides of the L-shaped base, two A test rod, two tension springs and a protective cover, the test rod is located in the middle of the two fiber Bragg grating sensors and connected with the two fiber Bragg grating sensors, the test rod is connected to the side wall of the L-shaped base through a rotating shaft, and the test One end of the rod is connected with the extension spring, the other end is in contact with the metal plate to be tested, and the other end of the extension spring is fixed on the L-shaped base. The invention can meet the long-term real-time monitoring of metal surface, is easy to install, has corrosion resistance, high measurement accuracy, good stability, adjustable sensitivity and measurement range, can amplify the measured corrosion signal, can perform temperature self-compensation, and has better performance. economic and social benefits.

Description

technical field [0001] The invention relates to optical fiber grating technology, belongs to the field of optical fiber sensing technology, in particular to a device for long-term real-time monitoring of metal corrosion. Background technique [0002] Corrosion of metal materials needs to be monitored in many fields such as aircraft, bridges, ships, oil and gas pipelines, and subsea tunnels. Metal corrosion is a long-term process, especially when approaching or exceeding the design life, corrosion monitoring becomes a strong need. The current corrosion monitoring methods can be roughly divided into two categories: electrochemical methods and non-electrochemical methods. Among them, electrochemical methods include half-cell potential method, linear polarization method, AC impedance method, electrochemical noise method, etc., and non-electrochemical methods include visual inspection method, weight loss method, ultrasonic method, eddy current method, acoustic emission method, e...

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Problems solved by technology

Among them, electrochemical methods include half-cell potential method, linear polarization method, AC impedance method, electrochemical noise method, etc., and non-electrochemical methods include visual inspection method, weight loss method, ultrasonic method, eddy current method, acoustic emission method, etc. However, most of the above monitoring methods have problems such as inconvenient operation, complicated monitoring process, long monitoring execution time, and low monitoring accuracy.

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