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Multipoint displacement testing method based on fiber grating sensing technology

A sensing technology, fiber grating technology, applied in the field of multi-point displacement test, can solve the problems of blankness and inability to directly calculate the displacement of each point, and achieve the effects of low cost, ensuring safety and convenient installation

Active Publication Date: 2019-12-24
ZHEJIANG HUADONG ENG SAFETY TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the multi-point displacement measurement devices used in deep areas at home and abroad mainly include inclinometer tubes for horizontal displacement measurement and multi-point displacement gauges for testing axial deformation, and the multi-point strain sensors are connected in series to calculate the deflection, which needs to increase the displacement of two points Boundary test, and the deep horizontal displacement test can only measure the horizontal displacement of the orifice point (single point). If the displacement test alone is used, the displacement of each point cannot be directly calculated. However, the multi-point settlement measurement device for linear distribution is still is blank

Method used

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  • Multipoint displacement testing method based on fiber grating sensing technology
  • Multipoint displacement testing method based on fiber grating sensing technology
  • Multipoint displacement testing method based on fiber grating sensing technology

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Embodiment Construction

[0023] This embodiment is a multi-point displacement testing method based on fiber Bragg grating sensing technology, which has a carrier, an inclinometer 1, a fiber Bragg grating string I3 and a fiber Bragg grating string II4, and the specific steps are as follows:

[0024] S01, install the inclinometer 1 on one end of the carrier (see figure 1 ), as a displacement of 0 points;

[0025] S02. Install the fiber grating string I3 and the fiber grating string II4 symmetrically on both sides of the carrier with respect to the center line of the carrier (see figure 2 );

[0026] S03. Obtain the initial angle θ of the inclinometer 1 in the initial state 0 ; The measured initial central wavelength of the fiber grating string I3 in the initial state is λ B10 ,λ B20 ,λ B30 ,...,λ Bi0 ,...,λ Bm0 , the initial central wavelength of the fiber grating string II4 in the initial state is λ’ B10 , λ' B20 , λ' B30 ,...,λ' Bi0 ,...,λ' Bm0 ;

[0027] S04. After the carrier deforms s...

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Abstract

The invention relates to a multipoint displacement testing method based on a fiber grating sensing technology. The invention aims to provide a multipoint displacement testing method based on the fibergrating sensing technology, and the method is simple to implement, high in measurement accuracy and capable of realizing on-line monitoring. The technical scheme of the invention is a multipoint displacement testing method based on the fiber grating sensing technology. The testing method is characterized by providing a carrier, an inclinometer, a fiber grating string I and a fiber grating stringII; installing the inclinometer at one end of a carrier to be used as a displacement 0 point; symmetrically arranging the fiber grating string I and the fiber grating string II on two sides of the carrier with respect to a central line of the carrier; measuring the central wavelengths lambda Bi0 and lambda'Bi0 of the fiber grating string I and the fiber grating string as initial values; and acquiring an initial angle theta0 of the inclinometer. The testing method disclosed by the invention is suitable for the technical fields of fiber grating sensing and engineering measurement.

Description

technical field [0001] The invention relates to a multi-point displacement testing method based on fiber grating sensing technology. It is suitable for the fields of fiber grating sensing technology and engineering measurement technology. Background technique [0002] During the excavation process of dams, tunnels, underground roadways, foundation pits, slopes, etc., engineering and technical personnel often need to understand the horizontal displacement of the deep part, the settlement of the adjacent ground, and its temporal and spatial evolution rules to determine the support method. And parameters to ensure the safety of engineering construction. [0003] At present, the multi-point displacement measurement devices used in deep places at home and abroad mainly include inclinometer tubes for horizontal displacement measurement and multi-point displacement gauges for testing axial deformation, and the multi-point strain sensors are connected in series to calculate the def...

Claims

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Application Information

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IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 王群敏陈文华张文君孙浩周德春
Owner ZHEJIANG HUADONG ENG SAFETY TECH
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