CN107218898A - A kind of star fiber optic grating strain piece of surface Two-dimensional strain detection - Google Patents
A kind of star fiber optic grating strain piece of surface Two-dimensional strain detection Download PDFInfo
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- CN107218898A CN107218898A CN201610176708.1A CN201610176708A CN107218898A CN 107218898 A CN107218898 A CN 107218898A CN 201610176708 A CN201610176708 A CN 201610176708A CN 107218898 A CN107218898 A CN 107218898A
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- strain
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- axles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The present invention be it is a kind of can carry out the FBG strain gauge of component surface Two-dimensional strain detection, belong to fiber grating sensing technology field, for solving resistance strain gage the problem of the limitation of inflammable and explosive occasion.It is made up of star metallic elastic platelet substrate and three Bragg gratings, and the Bragg grating that these three characteristic wavelengths are differed is one another in series and is fixed on using adhesion process on three survey axles of star sheet metal substrate.Using when FBG strain gauge need to be allowed to by stud welding technology be fixed on component surface to be measured.Change by monitoring fiber grating characteristic value can draw the strain of three survey direction of principal axis, then can calculate component surface principal strain to be measured and its direction by the analysis and calculating of stress circle, to realize the purpose for measuring component surface strain to be measured.The present invention has the advantages that sensitivity height, essential safety, lightweight, small volume.
Description
Technical field
The invention belongs to fiber grating sensing technology field, more particularly to a kind of detection means surface Two-dimensional strain
FBG strain gauge, its structure is made up of metallic elastic platelet substrate and bragg grating, with reality
The Two-dimensional strain detection of existing component surface.
Background technology
Resistance strain gage is the electronic component for strain detecting.It can change strain variation on mechanical component
It is the conditional electronic sensing element of strain detecting in engineering structure or component test for resistance variations.Resistance-strain
Piece has diversified forms, and conventional has wire form and foil.At present, what is be most widely used is with various electrostrictive strains
Hinder Alloy Foil be sensitive grid metal foil stain gauge, it have it is easy to make, cheap, easy to use,
Reliable advantage is detected, so being widely used in engineering structure or the strain detecting of part.But, it is this
Electric-type sensor by representative of type metal foil type resistance strain gage has obvious weak point in strain detecting field,
For example, when carrying out the strain detecting of inflammable and explosive occasion, the electric spark produced in electrical sensor easily draws
Rise and fire, thus can not use.
Fiber grating is one of fiber optic passive device with the fastest developing speed recent years, since 1978K.O.
Hill et al. used first in germnium doped fiber standing wave wrting method be made in the world first fiber grating with
Come, because it has the advantages that many unique, thus achieve and be widely applied in fiber parametric amplification field.
Detection device by sensing unit of fiber grating have the advantages that compared to the electric class detection device of tradition it is a lot, such as
Electromagnetism interference, small volume, lightweight, simple in construction etc..In fact fiber grating oneself turn into most have at present
One of future, most representational fiber parametric amplification device, it has greatly widened answering for sensing technology
With scope, accuracy of detection height can be used for the detection of inflammable and explosive occasion.
FBG strain gauge is made up of bragg grating and metallic elastic platelet substrate, this optical fiber light
Grid foil gauge has obvious technical advantage compared to metal foil stain gauge in inflammable and explosive occasion, still, this
Grating strain piece carries out one-dimensional axial strain detection in the case that only oneself knows in principal strain directions, also can be to two
Principal strain directions and size on dimensional plane are detected.The present invention is using by star metallic elastic platelet substrate
The FBG strain gauge of structure and bragg grating composition, the need for meeting Two-dimensional strain detection.
The content of the invention
It is an object of the invention to solve resistance strain gage the problem of the limitation of inflammable and explosive occasion there is provided
A kind of design of star fiber optic grating strain piece, can carry out Two-dimensional strain detection to component surface to be measured.
To achieve the above object, the present invention is adopted the following technical scheme that：
The star fiber optic grating strain piece detected for component surface Two-dimensional strain to be measured, with star metallic elastic
Thin slice is constituted as substrate, and the bragg grating of two dimensional topology, as shown in Figure 1.
Described metallic elastic platelet substrate is tried one's best from the material matched with component surface mechanical performance to be measured
Material, to reduce the detection error of foil gauge.Metallic elastic platelet substrate E thickness be 1.5mm to 2mm,
Star is shaped as, the metallic elastic platelet substrate there are three survey axles, and the length of three survey axles is 25mm, angle
Each other 120 degree two-by-two of degree, the width of three survey axles are 4mm, each to survey that one of 1mm of quarter in the middle of axle is wide, 0.5mm
Deep fiber grating mounting groove, installation slot length is 18mm.A points are the geometry of the metallic elastic platelet substrate
Center, is used as solder joint at 3 points together with B, C, D and FBG strain gauge is fixedly mounted.
Described Bragg grating 1 (FBG1), Bragg grating 2 (FBG2) and Bragg grating 3 (FBG3)
Bonding technique need to be used to be fixed in star metallic elastic platelet substrate, FGB1 glue spots are a points and b points,
FGB2 glue spots are c points and d points, and FGB3 glue spots are e points and f points.
Described FBG1, FBG2 and FBG3 must have appropriate stretching when being fixed, to ensure FBG
The two-way strain of energy detection means.
Described FBG1, FBG2 and FBG3 must select the FBG of different characteristic wavelength, should making fiber grating
These three FBG should use series system when becoming piece.
Described star fiber optic grating strain piece should pass through stud before strain measurement is carried out to component surface to be measured
Star fiber optic grating strain piece is fixed on component surface to be measured by welding technology.
The present invention is a kind of strain detecting device that can be detected to component surface Two-dimensional strain.The present invention should
Becoming piece has the advantages that sensitivity height, essential safety, lightweight, small volume, is easy to networking.
Brief description of the drawings
Fig. 1 is star fiber optic grating strain chip architecture schematic diagram of the present invention.
Embodiment
Below in conjunction with Fig. 1, the invention will be further described.
The present invention is a kind of star fiber optic grating strain piece that can be detected to component surface Two-dimensional strain, tool
Body implementation steps are as follows：
Step one：Make FBG strain gauge
The star sheet metal substrate handled well is lain on processing platform, then ready Prague light
Grid such as figure is fixed with adhesion process, Bragg grating 1, Bragg grating 2 and Bragg grating when fixed
3 should have appropriate stretching, to ensure that foil gauge can experience the two-way strain of component.
Step 2：Fixed FBG strain gauge
Tetra- points of A, B, C, D are welded using stud welding technology FBG strain gauge is fixed on component surface.
Step 3：Change by monitoring fiber grating characteristic value can draw the strain of three survey direction of principal axis,
Component surface principal strain to be measured and its direction can be calculated by the analysis and calculating of stress circle again, to realize survey
Measure the purpose of component surface strain to be measured.
Claims (2)
1. a kind of can carry out the FBG strain gauge of component surface Two-dimensional strain detection, it is by star metallic elastic
The Bragg grating composition of platelet substrate and three different characteristic wavelength, two dimension is being carried out to component surface
FBG strain gauge is weldingly fixed on by component surface to be measured by stud welding technology before strain detecting.
2. the star metallic elastic platelet substrate described in claim 1, it is characterized in that：Star is shaped as, thickness is
1.5mm to 2mm, the sheet metal has three survey axles, and the length of three survey axles is 25mm, angle
Each other 120 degree two-by-two, the width of three survey axles are 4mm, and it is wide to carve one of 1mm in three side axles,
Fiber grating mounting groove deep 0.5mm, the Bragg grating of these three different characteristic wavelength is one another in series logical
Adhesion process is crossed to be fixed in the fiber grating mounting groove of three survey axles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610176708.1A CN107218898A (en) | 2016-03-22 | 2016-03-22 | A kind of star fiber optic grating strain piece of surface Two-dimensional strain detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610176708.1A CN107218898A (en) | 2016-03-22 | 2016-03-22 | A kind of star fiber optic grating strain piece of surface Two-dimensional strain detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107218898A true CN107218898A (en) | 2017-09-29 |
Family
ID=59927382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610176708.1A Pending CN107218898A (en) | 2016-03-22 | 2016-03-22 | A kind of star fiber optic grating strain piece of surface Two-dimensional strain detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107218898A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855780A (en) * | 2019-01-15 | 2019-06-07 | 中国计量大学 | A kind of temperature compensation optical fiber grating sensor for joint of robot torque measurement |
| CN110514131A (en) * | 2019-08-26 | 2019-11-29 | 西安交通大学 | A kind of intelligence laminar fiber grating two-dimensional strain transducer |
| CN110966913A (en) * | 2019-12-12 | 2020-04-07 | 西安电子科技大学 | Flexible large-strain sensor based on liquid metal and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968773A (en) * | 2013-01-29 | 2014-08-06 | 中国计量学院 | Flexible high-temperature raster strain foil for two-dimensional stress detection |
| CN204241501U (en) * | 2014-12-05 | 2015-04-01 | 国家电网公司 | Based on the direction measuring apparatus of fiber grating sensing technology |
-
2016
- 2016-03-22 CN CN201610176708.1A patent/CN107218898A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968773A (en) * | 2013-01-29 | 2014-08-06 | 中国计量学院 | Flexible high-temperature raster strain foil for two-dimensional stress detection |
| CN204241501U (en) * | 2014-12-05 | 2015-04-01 | 国家电网公司 | Based on the direction measuring apparatus of fiber grating sensing technology |
Non-Patent Citations (2)
| Title |
|---|
| 曾虹 等: "高温光纤布拉格光栅"T"型应变片技术研究", 《传感技术学报》 * |
| 董丽虹 等: "《应力测试技术及在再制造工程领域的应用》", 30 June 2014 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855780A (en) * | 2019-01-15 | 2019-06-07 | 中国计量大学 | A kind of temperature compensation optical fiber grating sensor for joint of robot torque measurement |
| CN109855780B (en) * | 2019-01-15 | 2024-03-26 | 中国计量大学 | Temperature compensation fiber bragg grating sensor for measuring robot joint torque |
| CN110514131A (en) * | 2019-08-26 | 2019-11-29 | 西安交通大学 | A kind of intelligence laminar fiber grating two-dimensional strain transducer |
| CN110514131B (en) * | 2019-08-26 | 2021-01-19 | 西安交通大学 | Intelligent layered fiber grating two-dimensional strain sensor |
| CN110966913A (en) * | 2019-12-12 | 2020-04-07 | 西安电子科技大学 | Flexible large-strain sensor based on liquid metal and preparation method thereof |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170929 |
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| RJ01 | Rejection of invention patent application after publication |