A fiber grating differential strain gauge and its production and use method

A fiber grating and manufacturing method technology, applied in the direction of optical devices, measuring devices, instruments, etc., can solve the problems of temperature and strain cross-sensitivity, inconvenient engineering construction, and affecting the accuracy of measurement, so as to eliminate accuracy and consistency performance, elimination of chirp phenomenon, and easy operation

Inactive Publication Date: 2017-02-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the engineering application of FBG sensors: (1) Since FBG sensors are sensitive to both temperature and strain, it is necessary to solve the problem of cross-sensitivity of temperature and strain during application
(2) The fiber grating itself has a certain length. If it is directly cured on the component to be monitored, it is difficult to ensure that the strain field on the grating is uniform, which will easily lead to the chirp of the fiber grating and affect the measurement accuracy.
(3) Directly curing the fiber grating on the monitored body is not convenient for engineering construction

Method used

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  • A fiber grating differential strain gauge and its production and use method
  • A fiber grating differential strain gauge and its production and use method
  • A fiber grating differential strain gauge and its production and use method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention, figure 2 for figure 1 The top view of , which includes the first fiber grating 1, the second fiber grating 2, the elastic body and the mounting arm, the elastic body is a ring-shaped deformation body 3 (the steel ring-shaped deformation body is used in this embodiment) wherein the two ends of the first fiber grating 1 are pasted on one side of the annular deformation body 3, and the two ends of the second fiber grating 2 are pasted on the other side of the annular deformation body 3, the first fiber grating 1 and the second optical fiber The gratings 2 are perpendicular to each other, and the gratings of both pass through the central axis of the annular deformation body 3 and do not touch; the mounting arms are fixed on both sides of the annular deformation body 3 and are divided into the first mounting arm 4 and the second mounting arm 4. Two installation arms 5, and in the same ...

Embodiment 2

[0042] The structure and principle of this embodiment are basically the same as those of Embodiment 1, the difference is that the elastic body is a hollow regular polygon deformed body.

[0043] Take the regular quadrilateral, that is, the square deformed body as an example, such as image 3 and Figure 4 As shown, it includes a first fiber grating 1, a second fiber grating 2, an elastic body, a first mounting arm 4 and a second mounting arm 5, and the elastic body is a square deformation body 3; the installation method and embodiment of this embodiment One is installed in the same way. Fix this embodiment on the monitored body through the mounting arm, and use the following formula to obtain the variation of the grating center wavelength differential of the fiber grating differential strain gauge:

[0044] Δd = ( 1 - P e ) ...

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Abstract

The invention provides a fiber grating differential strain gauge. The fiber grating differential strain gauge comprises a first fiber grating, a second fiber grating, an elastomer and installation arms, wherein the elastomer is a deformable body which is hollow and is in axial symmetry and central symmetry, the two ends of the first fiber grating are bonded to one side of the elastomer, the two ends of the second fiber grating are bonded to the other side of the elastomer, the first fiber grating and the second fiber grating are perpendicular to each other, grating bodies of the fiber gratings penetrate through the center of the elastomer and do not make contact with each other, the installation arms are fixed to the two sides of the elastomer, the installation arms and the first fiber grating are arranged in the same direction, the thickness of each installation arm is larger than that of the elastomer, and open grooves which penetrate through a tail fiber of the first fiber grating are formed in the installation arms. According to the fiber grating differential strain gauge, the two-end bonding mode is adopted for the structure, it is ensured that stress of grating parts is uniform, the chirp phenomenon is eliminated, detection accuracy is ensured, a manufacturing process of the fiber grating differential strain gauge can be simpler through the two-end bonding mode, and operation is easier.

Description

technical field [0001] The invention belongs to optical fiber sensing components, and in particular relates to a fiber grating differential strain gauge and a method for making and using the same. Background technique [0002] In order to carry out force analysis of structures or monitor mechanically loaded components, resistance strain gauges are often used to detect the strain of structural elements loaded with force. This kind of resistance strain gauge is composed of base, sensitive grid, cover layer and lead-out wire. The sensitive grid is the sensitive part where the resistance strain is converted into resistance change; the base and cover layer have the functions of positioning and protecting the resistance wire and the measured object. ; The lead wire plays the role of connecting the measuring wire; in order to detect the strain related to the load, these resistance strain gauges are laid on the monitored member, and the strain is converted into an electrical signal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 潘建军李维来王立新刘捷鲁晓珊庞锦
Owner WUHAN UNIV OF TECH
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