Optical fiber corrosion sensor with stepped metal sensitive films and preparation method of optical fiber corrosion sensor

Abstract

The invention relates to an optical fiber corrosion sensor with step-structured metal sensitive films and a preparation method of the optical fiber corrosion sensor. The optical fiber corrosion sensor consists of an optical fiber cladding layer, a fiber core, conductive films and stepped sensitive films. The sensitive portion, corroded by sensing materials, of the optical fiber corrosion sensor is a sensitive film layer made of steel, aluminum or copper and the like, and each sensitive film is in a stepped layering continuous structure. On a section of a multimode or single-mold optical fiber, the fiber core is exposed after the optical fiber cladding layer is removed. The conductive films are preformed on the exposed fiber core. The conductive films are sectionally coated by insulation materials. The metal sensitive films in step structures and different in thickness are prepared on the uncoated portions of the conductive films by means of electroplating. The preparation method is simple to operate, the service lives of the metal sensitive films of the prepared optical fiber corrosion sensor are long, optical signal responses can be generated within a wider thickness range of the metal films, and the problems that a detection range of an existing optical fiber corrosion sensor with metal sensitive films is narrow and early detection sensitivity and the service life are mutually restricted. The optical fiber corrosion sensor can be used for detecting corrosion of different metal structure works such as bridges and pipelines.

Description

technical field [0001] The invention relates to a metal-sensitive film optical fiber corrosion sensor with a stepped structure and a preparation method thereof, belonging to the technical field of optical fiber corrosion monitoring of metal materials. Background technique: [0002] Optical fiber sensing technology is a new technology developed with the progress of optical fiber communication and optoelectronic technology in the 1970s. It is a new sensing technology that uses light waves as the transmission medium to perceive and transmit external measured signals through optical fibers. The optical fiber itself is small in size and light in weight, so it is convenient to embed in the measured part for in-situ measurement. Moreover, the optical fiber has a wide operating frequency band and a large dynamic range, which is suitable for telemetry and remote control. It is an excellent low-loss transmission line. Optical fiber sensing technology also has the characteristics of hi...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, aiming at the problem of the limited detection range of the current single-thickness metal sensitive film optical fiber corrosion sensor, according to the test principle of the metal sensitive film corrosion sensor, provide a kind of optical fiber with a stepped metal sensitive film An optical fiber corrosion sensor and a preparation method thereof, the method prepares a metal sensitive film with a stepped structure on the optical fiber core for optical fiber sensing and monitoring of metal corrosion, and the prepared optical fiber corrosion sensor can be produced within a wide range of metal film thicknesses Optical signal response, solving the problems of narrow detection range of existing metal-sensitive film optical fiber corrosion sensors and mutual restriction of early detection sensitivity and service life

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