Sensitive membrane and corrosion Bragg grating-based corrosion sensor and equipment

Abstract

The invention provides a sensitive membrane and corrosion Bragg grating-based corrosion sensor and a preparation method thereof. The sensitive membrane and etching Bragg grating-based corrosion sensor comprises an optical fiber, wherein a corrosion Bragg grating is written on the optical fiber, a sensitive membrane is deposited outside the corrosion Bragg grating and is identical with monitored metal in materials with the thickness of 10nm-1 micron; the diameter of the corrosion Bragg grating is 8.6-12 microns, compared with the sensor without corrosion, the sensor with corrosion has the advantages that the central wavelength of the grating is reduced by 2-6nm, the central peak value is attenuated by 10-20dBm. The invention provides a sensor for realizing corrosion monitoring by utilizing the refractive index response mechanism of the grating, the corrosion grating responses to the refractive index of the outside environment, the wavelength of the grating is shifted by the change of the corrosion refractive index of the sensitive membrane, so that the metal corrosion process can be monitored. According to the sensor, the structure is simple, the cost is low, the sensitivity is high, non-destructive monitor can be realized, and the distributive measurement can be realized by arranging a plurality of sensors on one optical fiber.

Description

Technical field [0001] The invention belongs to the field of optical fiber sensing, and specifically relates to a corrosion sensor based on a sensitive film and an etched Bragg grating and a preparation method thereof, and is mainly applied to metal corrosion monitoring in the fields of roads, bridges, water conservancy, ports, aviation and the like. Background technique [0002] The corrosion resistance of metal materials is worse than that of non-metal materials. Metal corrosion has a great destructive effect in the current industry, bringing huge economic losses and social harm to humans. In construction projects, the steel bars inside the concrete structure are corroded, leading to premature failure of the structure. In marine engineering, corrosive ions in seawater will accelerate the electrochemical corrosion of metals. In aviation engineering, the corrosion damage of aircraft metal structure is an important factor affecting the life of the aircraft. In the above fields, ...

AI Technical Summary

Problems solved by technology

In the above fields, some methods of inhibiting metal corrosion have been adopted, but corrosion monitoring and early warning are still needed

Traditional corrosion monitoring methods, such as electrochemical methods, sampling methods, mechanical testing methods, etc., have limitations to varying degrees

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