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A fiber grating sensor for measuring the deformation of arc-shaped components and its measuring method

A fiber grating and sensor technology, which is applied in the field of fiber grating sensing, can solve problems such as stress and strain of difficult arc-shaped curved surface components, poor resistance to external electromagnetic interference, and impact on measurement accuracy, so as to achieve long service life and improve post-monitoring efforts And safety factor, the effect of high mechanical strength

Active Publication Date: 2019-11-15
海南省众邑新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by packaging materials, the appearance of fiber grating sensors is usually linear, which can only be used to measure the tangential stress and strain of solitary structures with large radius and small curvature, such as large arch bridges and solitary beams. For engineering components such as tunnels with small radius and large curvature, due to the different shapes of the measured component and the fiber grating sensor, the strain generated by the same external force is also different, which greatly affects the measurement accuracy.
Sticking multiple resistance strain gauges along the ring direction can be used to detect the force of the ring member, but this technology that uses electrical signals as the transmission method has poor resistance to external electromagnetic interference, and the strain gauges have been exposed to various complex engineering environments for a long time , very limited service life
[0004] In summary, it is difficult to measure the stress and strain of arc-shaped curved surface components in the prior art. Therefore, the present invention is based on the existing fiber grating optical sensing element and the shortcomings of the above-mentioned background technology, and aims to provide a method capable of measuring arc-shaped curved surface components. Fiber Bragg Grating Sensor for Component Stress and Strain

Method used

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  • A fiber grating sensor for measuring the deformation of arc-shaped components and its measuring method
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  • A fiber grating sensor for measuring the deformation of arc-shaped components and its measuring method

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Embodiment 1

[0026] A fiber grating sensor for measuring the deformation of an arc-shaped member, comprising a fiber grating 2 and a protective material 1 coated outside, the fiber grating sensor 3 is arc-shaped, and groove patterns are arranged on the surface of the protective material 1; the preparation of the The protective material includes the following raw materials: unsaturated polyester resin, quartz sand, basalt fiber, curing agent and accelerator; the parts by weight of each raw material are: 100 parts of unsaturated polyester resin, 20 parts of quartz sand, 1 part of curing agent, and accelerator 0.5 parts; the volume of the basalt fiber is 0.2% of the volume of the unsaturated polyester resin; the particle size of the quartz sand is 75 μm; the length of the basalt fiber is 5 mm and the diameter is 14 μm.

Embodiment 2

[0028] A fiber grating sensor for measuring the deformation of an arc-shaped member, comprising a fiber grating 2 and a protective material 1 coated outside, the fiber grating sensor 3 is arc-shaped, and groove patterns are arranged on the surface of the protective material 1; the preparation of the The protective material includes the following raw materials: unsaturated polyester resin, quartz sand, basalt fiber, curing agent and accelerator; the parts by weight of each raw material are: 100 parts of unsaturated polyester resin, 40 parts of quartz sand, 2.5 parts of curing agent, accelerator 1.25 parts; the volume of the basalt fiber is 0.6% of the volume of the unsaturated polyester resin; the particle size of the quartz sand is 60 μm; the length of the basalt fiber is 7mm and the diameter is 18um.

Embodiment 3

[0030] A fiber grating sensor for measuring the deformation of an arc-shaped member, comprising a fiber grating 2 and a protective material 1 coated outside, the fiber grating sensor 3 is arc-shaped, and groove patterns are arranged on the surface of the protective material 1; the preparation of the The protective material includes the following raw materials: unsaturated polyester resin, quartz sand, basalt fiber, curing agent and accelerator; the parts by weight of each raw material are: 100 parts of unsaturated polyester resin, 30 parts of quartz sand, 2 parts of curing agent, accelerator 1 part; the volume of the basalt fiber is 0.6% of the volume of the unsaturated polyester resin; the particle size of the quartz sand is 50 μm; the length of the basalt fiber is 6 mm and the diameter is 16 um.

[0031] The preparation method of the fiber grating sensor in any one of the above-mentioned embodiments 1 to 3 comprises the following steps:

[0032] S1. Add unsaturated polyester...

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Abstract

The invention discloses a fiber grating sensor for measuring deformation of an arc-shaped member and a measuring method thereof. The fiber grating sensor assumes an arc shape and includes a fiber grating and a protective material which cover outside the fiber grating. The protective material is a ductile resin-based composite material. The sensor having a shape substantially identical to the shape of a to-be-detected arc-shaped member can be made by one-time injection molding and using a special mould. For all kinds of arc-shaped members, especially the type having great curvature and small radius, the sensor is embedded to a to-be-detected member and the sensor and the to-be-detected member are deformed simultaneously under an external force, which enables precise measurement of strain of stress. According to the invention, the fiber grating has the characteristics of high mechanical intensity and strong corrosion-resistance, can be applied to different engineering environments and has long service life.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensing, in particular to a fiber grating sensor for measuring the deformation of an arc-shaped component and a measuring method thereof. Background technique [0002] With the continuous acceleration of my country's economic construction, in the process of continuously improving the construction of basic public facilities and housing construction in cities and surrounding towns, various curved surface engineering components such as pipelines, culverts and tunnels are becoming more and more common. As the key parts of large-scale civil engineering, these curved surface engineering structures are very complicated in stress situation. And their stress conditions are directly related to the safety of engineering buildings, so it is particularly important to monitor their stress and strain in real time. [0003] Since bare fiber gratings are relatively fragile and are easily damaged in harsh wo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/165
Inventor 毛若卿陈宏哲王登科张晓乔严婉王亚婕宋兴乐胡俊鹏王腾
Owner 海南省众邑新材料研究院有限公司
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