A fiber grating temperature compensation method and ultra-thin miniature steel bar strain gauge

A fiber grating, temperature compensation technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of increasing the disturbance of the original structure, increasing the volume of the sensor, increasing the disturbance of the original structure, etc.

Active Publication Date: 2016-08-31
HOHAI UNIV
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Problems solved by technology

For the test of the internal strain of the structure, the compensation method of setting an additional fiber grating temperature sensor will undoubtedly increase the disturbance to the original structure and increase the difficulty of embedding and protection; Not being affected by strain will also increase the volume of the sensor, which in turn will increase the disturbance to the original structure

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  • A fiber grating temperature compensation method and ultra-thin miniature steel bar strain gauge
  • A fiber grating temperature compensation method and ultra-thin miniature steel bar strain gauge
  • A fiber grating temperature compensation method and ultra-thin miniature steel bar strain gauge

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Embodiment Construction

[0044] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0045] An optical fiber grating temperature compensation method and an ultra-thin miniature steel bar strain gauge, including an optical fiber grating temperature compensation method and an optical fiber grating ultrathin miniature steel bar strain gauge;

[0046] A fiber grating temperature compensation method, using two fiber gratings, the angle between the axial direction of fiber grating A and the principal strain direction is α, the angle between the axial direction of fiber grating B and the principal strain direction is β, and α and β are desirable It is any value between 0° and 90°, and the absolute values ​​of α and β are not equal.

[0047] Such as figure 1 As shown, take the gauge length parallel to the principal strain direction as L, then within the range of the gauge length, the length L of the fiber grating A A and the length L of the f...

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Abstract

The invention provides an optical fiber grating temperature compensation method and an ultra-thin miniature steel bar strain gauge, which uses two optical fiber gratings that form a small angle with each other to simultaneously measure the strain and temperature change of the steel bar, and realizes the corresponding strain measurement according to the strain difference of the two optical fiber gratings The resulting temperature compensation, this compensation method can greatly improve the integration of fiber grating steel strain gauge. The ultra-thin miniature steel bar strain gauge of the present invention uses the two ends of the arc-shaped metal connecting piece with two grooves to be respectively fixed with an arc-shaped metal sheet, and two bare optical fiber gratings are pasted in the two grooves forming a small angle with each other to form a steel bar The body of the strain gauge. The steel bar strain can be measured by fixing the arc-shaped metal sheets at both ends of the steel bar strain gauge on the surface of the steel bar to be tested. The temperature compensation method of the invention can be used to calculate the steel bar strain and obtain the temperature at the measuring point at the same time. The strain gauge has high precision, small size and anti-electromagnetic interference, which can provide great convenience for the test of reinforced concrete structures.

Description

technical field [0001] The invention relates to an optical fiber grating temperature compensation method and an ultra-thin miniature steel bar strain gauge, in particular to a method for performing temperature compensation on optical fiber grating strain test results and a sensor for measuring steel bar strain in a reinforced concrete structure. Background technique [0002] The stress status of reinforced concrete is an important parameter related to the safety of reinforced concrete engineering structures. In order to understand the stress status of reinforced concrete structures, it is usually necessary to arrange strain measuring points inside, measure the strain distribution, and then calculate the stress distribution. For the measurement of strain, it mainly includes concrete strain measurement and steel bar strain measurement. Due to the inhomogeneity and easy cracking of concrete, it is difficult and less reliable to measure the strain of concrete. Therefore, in pra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 周广东张欢胡锦林
Owner HOHAI UNIV
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