On-line monitoring device for real-time stress of welding seam on buried pipeline based on optical fiber grating

Abstract

The invention relates to an on-line monitoring device for real-time stress of a welding seam on a buried pipeline based on an optical fiber grating, and belongs to the monitoring technology field of buried pipelines. The on-line monitoring device for the real-time stress of the welding seam on the buried pipeline based on the optical fiber grating is characterized in that the on-line monitoring device comprises a microprocessor, a light spectrum demodulation instrument and a blazed optical fiber grating sensor, wherein the microprocessor is connected with the light spectrum demodulation instrument; the light spectrum demodulation instrument is connected with the blazed optical fiber grating sensor; the blazed optical fiber grating sensor consists of a blazed optical fiber grating, a supporting tube and a prestressed draw tape; the blazed optical fiber grating is assembled in the supporting tube; and the supporting tube is provided with the prestressed draw tape. The on-line monitoring device has the advantages of simple structure, low manufacturing cost, stable and reliable performance, long service life, accurate position judgment, reliable trend forecast, real-time detection, high data accuracy and the like, is compact to assembly and convenient to operate, and saves the time and the labor.

Description

technical field [0001] The invention belongs to the technical field of buried pipeline monitoring, in particular to an on-line monitoring device for real-time stress of buried pipeline welds based on optical fiber gratings. Background technique [0002] At present, sacrificial anode protection is usually used for the daily maintenance of buried pipelines. The detection methods are mostly based on the NACE ECDA (External Corrosion Direct Assessment) recommended method, and multiple detection methods such as PCM, DCVG / ACVG, and CIPS are used simultaneously for external anti-corrosion layer detection. In practical application, due to the complex environmental factors of field pipelines, various conditions such as terrain, surface structures, and crops along the line restrict the adoption of the above-mentioned technical means, so there is always a certain blind spot, which increases the risk of pipeline failure; traditional detection methods are mainly for outdoor In terms of c...

AI Technical Summary

Problems solved by technology

In practical application, due to the complex environmental factors of field pipelines, various conditions such as terrain, surface structures, and crops along the line restrict the adoption of the above-mentioned technical means, so there is always a certain blind spot, which increases the risk of pipeline failure; traditional detection methods are mainly for outdoor Corrosion integrity, almost no targeted means for stress concentration

In summary, since the traditional technology cannot meet the actual needs in terms of time, position judgment, trend prediction and other aspects, the invention of a new real-time online monitoring technology that can judge the stress change state of the pipeline is particularly necessary

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