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Fiber bragg grating high-temperature strain gauge and calibration method thereof

A technology of high-temperature strain gauges and fiber gratings, which is applied in the direction of optical devices, instruments, and measuring devices, can solve problems such as the inability to realize structural synchronization measurement, and achieve the effects of avoiding chirp phenomenon, high measurement accuracy, and simple structure

Active Publication Date: 2021-05-25
SUZHOU NUCLEAR POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used fiber grating strain sensors can only measure the strain in a single direction on the surface of the structure, and cannot realize the simultaneous measurement of the strain in multiple directions of the structure.

Method used

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  • Fiber bragg grating high-temperature strain gauge and calibration method thereof
  • Fiber bragg grating high-temperature strain gauge and calibration method thereof
  • Fiber bragg grating high-temperature strain gauge and calibration method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Example 1 Fiber Grating High Temperature Strap

[0032]Refer to the attachmentimage 3The fiber grating high temperature strain piece of the present embodiment includes a circular annular sensor substrate 10, and the optical fiber mounting arm 11, optical fiber, and protective cover 30 on the sensor substrate 10, the fiber mount arm 11 along the sensor substrate 10 The inner circumference is extended, and the fiber is arranged in the diameter of the sensor substrate 10. The optical fiber mounting arm 11 is located in the same plane in the same plane with the sensor substrate 10. The size of the protective cover 30 matches the outer diameter of the sensor substrate 10, the edges of the shield 30 are uniformly distributed with the connecting portion, and the shroud 30 is connected to the sensor substrate 10 for protecting the optical fiber, the protective cover 30 is Metal Material.

[0033]The stiffness of the sensor substrate 10 is less than the stiffness of the structured structure,...

Embodiment 2

[0044]Example 2 Calibration Method

[0045]Based on the strain sheet in Example 1, the calibration method in this embodiment is performed in accordance with the following steps:

[0046]1) Two stretching devices corresponding to both ends of the first fiber are fixed to the stress sensor calibration platform by tensile bore;

[0047]2) Get the tensile shift to ΔL by tensile shift methodiWhen the wavelength drift amount Δλ of the first fiberiWhere i = 1, 2, 3, ..., n;

[0048]3) Measure the length L between the two fixed ends of the first fiber, calculate the strain ε in the first fiber direction.i= ΔLi / L (i = 1, 2, ..., n);

[0049]4) Several measuring points (Δλ)iΕi) Linear fitting, fitting slope K1That is, it is the strain sensitivity of the strain sheet in the first fiber direction;

[0050]5) Sequentially on the second fiber, the third optical fiber repeat steps 1) to 4), and the strain sensitivity K is obtained in the second fiber and the third optical fiber direction, respectively.2And K3The c...

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Abstract

The invention discloses a fiber bragg grating high-temperature strain gauge which comprises a sensor substrate, an optical fiber mounting arm and optical fibers, wherein the optical fiber mounting arm and the optical fiber are arranged on the sensor substrate, the sensor substrate is in a circular ring shape, the optical fiber mounting arm is formed by extending inwards along the inner circumference of the sensor substrate, and the optical fibers are arranged along the diameter direction of the sensor substrate; the optical fibers comprises a temperature optical fiber used for sensing temperature only; the sensor substrate is provided with bosses with different heights, the bosses are used for fixing the optical fibers, and the bosses are used for avoiding cross contact between different optical fibers. According to the fiber bragg grating high-temperature strain gauge, the influence of temperature on strain measurement is eliminated; the boss design on the sensor substrate can effectively avoid the chirp phenomenon caused by cross contact of FBG optical fibers; the strain gauge has the advantages of simple structure, synchronous measurement of multidirectional strain, temperature compensation, high measurement precision and the like, and can be used for synchronous measurement of multidirectional strain on the surface of a structure.

Description

Technical field[0001]The present invention belongs to the field of structural strain measurement and sensor design, and in particular, the present invention relates to a fiber grating high temperature response sheet and a calibration method of the strain sheet.Background technique[0002]The strain is one of the important parameters of structural health monitoring, which can effectively respond to the force inside the structure. The commonly used strain measurement method is the resistance strain measuring method, but for the strain measurement of high temperature, moist, strong electromagnetic interference environments, there is a length of adhesive glue, the degeneration of the strain, severe electromagnetic interference, zero drift, strain piece corrosion, Measurement signal abnormalities and other problems. At the same time, the life of the resistance strain in the high temperature environment is short, and the installation survival is low, it is difficult to use long-term monitor...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 王红珂徐德城陈潇林磊张国栋薛飞
Owner SUZHOU NUCLEAR POWER RES INST
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