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

A fiber grating, long-period technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve problems such as long-period fiber grating strain gauges that have not yet been seen, and achieve the effect of simple structure, accurate and effective detection, and convenient installation.

Active Publication Date: 2012-07-11
ZHEJIANG ZHONGGONG PETROCHEMICAL EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment Construction

[0021] Attached below figure 1 -2 and the specific embodiment The present invention is described in further detail:

[0022] Long-period fiber grating strain gauges for micro-strain detection in high-temperature pipelines, such as figure 1 As shown, a metal substrate 1 is included, and the metal substrate 1 is H-shaped. The metal substrate 1 includes a first vertical beam 11, a second vertical beam 13, and is connected between the first vertical beam 11 and the second vertical beam 13. Between the beams 12, the first high-temperature long-period fiber grating 2 is longitudinally fixed on the first vertical beam 11, the second high-temperature long-period fiber grating 3 is laterally fixed on the beam 12, and the third high-temperature long-period fiber grating 4 is free at both ends. The ground is longitudinally fixed on the second vertical beam 13, and the first high-temperature long-period fiber grating 2, the second high-temperature long-period fiber grating 3, and the thi...

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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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 何正炎刘月明楼俊陈忠友丁益王晓郑炎祥倪进树杨志伟祝晓东
Owner ZHEJIANG ZHONGGONG PETROCHEMICAL EQUIP CO LTD
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