Long period fiber grating strain gauge for micro strain detection of high-temperature pipes

Abstract

The invention belongs to the field of micro strain detection technology of high-temperature pipes, and particularly relates to a long period fiber grating strain gauge for micro strain detection of high-temperature pipes, which comprises an H-shaped metal substrate; the metal substrate comprises a first vertical beam, a second vertical beam and a crossbeam; an LPFG (Long Period Fiber Grating)1 is vertically fixed on the first vertical beam; an LPFG2 is horizontally fixed on the crossbeam; two ends of an LPFG3 are freely and vertically fixed on the second vertical beam; the LPFG1, LPFG 2 and LPFG3 are optically connected with one another; and the three high-temperature long period fiber gratings have different characteristic wavelengths. The long period fiber grating strain gauge for micro strain detection of high-temperature pipes has the advantages as follows: as the three high-temperature long period fiber gratings which are distributed in an H shape are adopted, the horizontal and vertical strains of high-temperature pipes can be detected at the same time; a temperature compensation function is provided so that the high-temperature pipes above 200 DEG C can be detected; the structure is simple and the mounting is convenient; and correct and effective detection can be carried out on the two-dimensional strain states of outer walls of the high-temperature pipes.

Description

technical field [0001] The invention belongs to the technical field of micro-strain detection of high-temperature pipelines, and in particular relates to a long-period optical fiber grating strain gauge used for micro-strain detection of high-temperature pipelines. Background technique [0002] In modern society, high-temperature pressure pipelines are widely used in chemical industry, petroleum enterprises and power plants, and high-temperature pipeline leakage and explosion accidents occur from time to time every year. The main cause of the accident is high temperature creep and pipe wall corrosion and thinning. The failure strain of the pipe wall is a nonlinear process. If the dynamic, real-time and online failure monitoring data and forecast information of the high temperature pipeline can be provided, the pipeline failure can be effectively avoided. Therefore, it is of great significance to establish a real-time online monitoring system for high-temperature pipelines. ...

AI Technical Summary

Problems solved by technology

Some domestic universities, scientific research institutes and companies have conducted long-term research on the strain detection technology of high-temperature pressure pipelines, but no technical reports on long-period fiber grating strain gauges suitable for micro-strain detection of high-temperature pipelines have been seen.

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