Fiber grating strain sensor

A strain sensor, fiber grating technology, applied in instruments, optical devices, measuring devices, etc., can solve the problems of complex installation and small measurement range, and achieve the effect of not easy to fall off, small solder joints, and firm soldering

Inactive Publication Date: 2013-01-02
杭州珏光物联网科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fiber grating strain sensor with simple structure, large measuring range and convenient installation in order to overcome the problems of small measurement range and complicated installation of the fiber grating strain sensor in the prior art

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, but are only examples to make the advantages of the present invention more clear and easy to understand.

[0026] Such as figure 1 , 2, 3, 4 and 5, the proposed FBG strain sensor includes elastic strain gauge 1, FBG 11 and 12, armored sheath 14 and attachment 15. The elastic strain gauge 1 has a longitudinal axis and is symmetrical along the longitudinal axis, including a pair of symmetrical U-shaped beam elastic structures 5, a flat plate 10 connected to the U-shaped beam elastic structure 5, and a fiber grating 11 located on the longitudinal axis of the elastic strain gauge 1 and 12 thin slots 13, a pair of rectangular holes 6, temperature compensating means 9, fixing means 7, 8, armored sheath fixing means 2, 3, 4 positioned at the two ends of the thin slot 13 for passing pigtails; The device includes ...

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Abstract

The invention relates to a fiber grating strain sensor. An elastic strain sheet is provided with a longitudinal shaft and is symmetrical along the longitudinal shaft, the elastic strain sheet comprises a pair of symmetrical U-shaped beam elastic structures, a flat plate for connecting the U-shaped beam elastic structures, a groove used for placing fiber grating and located on the longitudinal axis of the elastic strain sheet, a pair of rectangular holes used for a tail fiber to penetrate and located at two ends of the groove, a temperature compensation device, a fixed device and a sheath fixing device. The fiber grating is arranged in the groove, two ends of the fiber grating are fixed at corresponding positions by using glass welding materials through a point welding mode, the tail fiber penetrates through the rectangular holes and are located on the other surface of the elastic strain sheet, a sheath is used for protecting, and the fiber grating strain sensor is formed by the elastic strain sheet, the fiber grating, the sheath and an auxiliary device. The fiber grating strain sensor is simple in structure, large in measuring range, convenient to install and capable of eliminating interference of temperature on the sensor effectively.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing and relates to an optical fiber grating strain sensor. Background technique [0002] Fiber Bragg grating is a kind of passive fiber optic device that has broad application prospects in the fields of fiber optic communication, fiber optic sensing and optical information processing. Sensors based on fiber gratings have the advantages of anti-electromagnetic interference, small size, and simple structure, and can achieve accurate measurements in harsh environments such as civil engineering and petrochemical industries. [0003] Strain measurement is an important means to monitor the health and safety of large-scale projects such as bridges and dams. In recent years, strain sensors based on fiber gratings have developed rapidly. Encapsulation of fiber gratings is an effective means to improve sensor performance and protect fiber gratings. The researchers paste the fiber grating direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 陈庆根罗宗胜王云鹏
Owner 杭州珏光物联网科技有限公司
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