Fiber grating sensor temperature stress decoupling method in metal hole structure

A kind of grating sensor and fiber grating technology, which is applied in the measurement, instrument, and optical device of the change force of the optical properties of the material when it is under stress, which can solve the problems of accuracy drop and achieve high accuracy and high decoupling accuracy , simple structure and implementation

Inactive Publication Date: 2017-10-17
BEIHANG UNIV
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Problems solved by technology

[0006] Aiming at the situation that the fiber grating sensor is used to monitor the crack or stress of the pore structure of metal materials, the accuracy is reduced due to the influence of temperature, a temperature and stress decoupling method for the fiber grating sensor is proposed, and the temperature and stress of the fiber grating sensor demodulated, thereby improving the accuracy of the FBG stress-strain sensor

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  • Fiber grating sensor temperature stress decoupling method in metal hole structure
  • Fiber grating sensor temperature stress decoupling method in metal hole structure
  • Fiber grating sensor temperature stress decoupling method in metal hole structure

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Embodiment Construction

[0035] The present invention is a method for decoupling temperature and stress of a fiber grating sensor in a metal hole structure, such as figure 1 As shown, its specific implementation steps are as follows:

[0036] Step 1: Realization of fiber grating sensor layout. According to the characteristics of the metal hole structure, the idea of ​​ring layout is adopted, and two embedded fiber grating sensors are used, such as figure 2 shown. The measured substrate used in the present invention is a thin metal plate of 500mm*500mm*2mm, and there is a circular hole with a diameter of 100mm in the middle of the plate. Such as image 3 As shown, all grid points are divided into 8 groups, which are named as Group 1, Group 2, Group 3, Group 4, Group 5, Group 6, Group 7, and Group 8. Each group contains grating points from two fiber grating sensors respectively.

[0037] Step 2: Measure the initial state of the measured substrate, that is, the central wavelength and temperature o...

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Abstract

The invention provides a fiber grating sensor temperature stress decoupling method in a metal hole structure. The fiber grating sensor temperature stress decoupling method in the metal hole structure comprises steps of designing a layout of the fiber grating sensor, measuring an original state of a detected basal body, applying an increasing pulling force to the detected basal body, measuring central wavelength changing conditions of two grid points in a first group, applying external force and temperature influences to the detected basal body at the same time, measuring a changing quantity of the central wavelength of each grid point, and further calculating stress strains of all other points around a hole. The fiber grating sensor temperature stress decoupling method in the metal hole structure realizes fiber grating sensor temperature and stress decoupling in the metal hole structure, respectively solves magnitudes of temperature and the stress of the fiber grating sensor, improves accuracy of a fiber grating stress sensor monitoring a structure stress, solves a problem that the accuracy of the fiber grating stress sensor is reduced due to temperature interference and benefits popularization and application of a fiber Bragg grating sensor.

Description

technical field [0001] The invention provides a method for decoupling temperature and stress of an optical fiber grating sensor based on a hole-containing metal structure, which relates to a situation in which the monitoring accuracy is reduced due to the influence of temperature when the optical fiber grating sensor is used to monitor the crack or stress of the hole structure of a metal material The invention relates to a stress and temperature decoupling method for a fiber grating sensor, belonging to the technical field of structural health monitoring. Background technique [0002] Fiber Bragg gratings are widely used in the field of structural health monitoring due to their light weight, anti-electromagnetic interference, and corrosion resistance. This leads to the reduction of the demodulation accuracy of the fiber grating sensor, which limits the popularization and application of the fiber grating sensor. [0003] The stress and temperature decoupling of FBG sensor is...

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Application Information

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IPC IPC(8): G01L5/00G01L1/24G01B11/16G01D3/028
Inventor 张卫方李英武任飞飞金博张萌梁小贝魏巍
Owner BEIHANG UNIV
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