CN205957913U - Two -dimentional strain detection's in surface star fiber grating foil gage - Google Patents
Two -dimentional strain detection's in surface star fiber grating foil gage Download PDFInfo
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- CN205957913U CN205957913U CN201620237856.5U CN201620237856U CN205957913U CN 205957913 U CN205957913 U CN 205957913U CN 201620237856 U CN201620237856 U CN 201620237856U CN 205957913 U CN205957913 U CN 205957913U
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- strain
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- fiber grating
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Abstract
The utility model relates to a two -dimentional strain detection's in surface star fiber grating foil gage belongs to the fiber grating sensing technology field for solve the problem of resistance strain gauge in the limitation of inflammable and explosive occasion. It comprises elastic slice basement of star metal and three bragg grating, and this three characteristic wavelength bragg grating inequality is established ties each other and is adopted sticky technology to fix in the three survey of star foil basement epaxially. Need when using to make it the fiber grating foil gage fix on the component surface of awaiting measuring through the arc stud welding technique. Change through monitoring optical fiber grating characteristic value can reach three the meeting an emergency of axle direction of surveying, and await measuring component surface principal strain and direction can be calculated out with calculating to the analysis of rethread stress circle to realize measuring the component surface strain's that awaits measuring mesh. The utility model has the advantages of sensitivity height, essential safety, light in weight, small.
Description
Technical field
The invention belongs to fiber grating sensing technology field, particularly to a kind of optical fiber of detection means surface Two-dimensional strain
Grating strain piece, its structure is made up of metallic elastic platelet substrate and bragg grating, to realize the two dimension of component surface
Strain detecting.
Background technology
Resistance strain gage is the electronic component for strain detecting.Strain variation on mechanical component can be converted to resistance by it
Change, is the conditional electronic sensing element of strain detecting in engineering structure or component test.Resistance strain gage has various ways, often
There are wire form and foil.At present, be most widely used is the type metal foil type with various strain electrical resist paper tinsels as sensitive grid
Foil gauge, it has easy to make, low price, easy to use, the reliable advantage of detection, so being widely used in engineering structure
Or the strain detecting of part.But, this electric-type sensor with type metal foil type resistance strain gage as representative is led in strain detecting
There is obvious weak point in domain, for example, when carrying out the strain detecting of inflammable and explosive occasion, the electric spark of generation in electrical sensor
Easily cause and fire, thus cannot use.
Fiber grating is one of fiber optic passive device with the fastest developing speed recent years, since 1978K.O.Hill etc.
People has been made in the world since first fiber grating using standing wave wrting method first in germnium doped fiber, due to it have many solely
Special advantage, thus achieve in fiber parametric amplification field and be widely applied.Detector with fiber grating as sensing unit
Part compares tradition electricity class detection device to be had the advantages that a lot, and such as electromagnetism interference, small volume, lightweight, structure are simple etc..Thing
In reality, fiber grating has become one of current the most promising, most representational fiber parametric amplification device, and it is greatly opened up
The wide range of application of sensing technology, accuracy of detection is high, 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 fiber grating strain
Piece compares metal foil stain gauge has obvious technical advantage in inflammable and explosive occasion, but, this grating strain piece only exists
Carry out one-dimensional axial strain detection in the case of principal strain directions is known, also can be to the principal strain directions on two dimensional surface and size
Detected.The present invention should using the fiber grating being made up of star metallic elastic platelet substrate structure and bragg grating
Become piece, to meet the needs of Two-dimensional strain detection.
Content of the invention
It is an object of the invention to solving resistance strain gage in the circumscribed problem of inflammable and explosive occasion, provide a kind of star
The design of shape FBG strain gauge, can carry out Two-dimensional strain detection to component surface to be measured.
For achieving the above object, the present invention adopts the following technical scheme that：
A kind of star fiber optic grating strain piece of surface Two-dimensional strain detection, by star metallic elastic platelet substrate and Bradley
Lattice fiber grating forms.
Described star metallic elastic platelet substrate is shaped as star, and described star metallic elastic platelet substrate has three sides
Axle, 120 degree each other of the angle between each side axle, each side axle is carved with fiber grating mounting groove.
Bragg grating is fixed in described fiber grating mounting groove, and described bragg grating is three,
Being one another in series of described bragg grating.
It is 1mm that described fiber grating installs well width, and depth is 0.5mm.
Brief description
Fig. 1 is star fiber optic grating strain chip architecture schematic diagram of the present invention.
Specific embodiment
Below in conjunction with Fig. 1, the invention will be further described.
For the star fiber optic grating strain piece of component surface Two-dimensional strain to be measured detection, using metallic elastic thin slice as base
Bottom, and the bragg grating composition of two dimensional topology, as shown in Figure 1.
Described metallic elastic platelet substrate is tried one's best from the material matching with component surface mechanical performance to be measured, to subtract
The detection error of few foil gauge.The thickness of this metallic elastic platelet substrate E is 1.5mm to 2mm, is shaped as star, this metal elastic
Property platelet substrate have three survey axles, the length of three survey axles are 25mm, each other 120 degree two-by-two of angle, three width surveying axles
It is 4mm, each is surveyed and carves one deep fiber grating mounting groove of 1mm width, 0.5mm in the middle of axle, and installation slot length is 18mm.A point
For the geometric center of this metallic elastic platelet substrate, being used as solder joint fixed installation fiber grating at 3 points together with B, C, D should
Become piece.
Described the first Bragg grating 1 (FBG1), the second Bragg grating 2 (FBG2) and the 3rd Bragg grating 3
(FBG3) need to be fixed in star metallic elastic platelet substrate using bonding technique, the glue spots of FGB1 are a point and b point, FGB2
Glue spots be c point and d point, the glue spots of FGB3 are e point and f point.
Described FBG1, FBG2 and FBG3, when being fixed, must have suitable stretching, to ensure that FBG can detection means
Two-way strain.
Described FBG1, FBG2 and FBG3 must from the FBG of different characteristic wavelength, when making FBG strain gauge this
Three FBG should adopt series system.
Described star fiber optic grating strain piece should pass through arc stud welding skill before carrying out strain measurement to component surface to be measured
Star fiber optic grating strain piece is fixed on component surface to be measured by art.
The present invention is a kind of star fiber optic grating strain piece that component surface Two-dimensional strain can be detected, is embodied as
Step is as follows：
Step one：Make FBG strain gauge
The star handled well foil substrate is lain on processing platform, then ready Bragg grating as schemed
It is fixed with adhesion process, when fixing, the first Bragg grating 1, the second Bragg grating 2 and the 3rd Bragg grating 3 should have
Suitable stretching, to ensure that foil gauge can experience the two-way strain of component.
Step 2：Fixing FBG strain gauge
Using stud welding technology welding tetra- points of A, B, C, D, FBG strain gauge is fixed on component surface.
Step 3：Three axial strains of survey can be drawn by monitoring the change of fiber grating characteristic wavelength, then lead to
The analysis of overstress circle and calculating can calculate component surface principal strain to be measured and its direction, to realize measuring component surface to be measured
The purpose of strain.
Claims (2)
1. a kind of star fiber optic grating strain piece of surface Two-dimensional strain detection is it is characterised in that include：
Star metallic elastic platelet substrate, described star metallic elastic platelet substrate is shaped as star, described star metallic elastic
Platelet substrate has three side axles, 120 degree each other of the angle between each side axle, and each side axle is carved with fiber grating mounting groove；
Bragg grating is fixed in described fiber grating mounting groove, and described bragg grating is three, described
Being one another in series of bragg grating.
2. surface according to claim 1 Two-dimensional strain detection star fiber optic grating strain piece it is characterised in that：Described
Fiber grating install well width be 1mm, depth be 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620237856.5U CN205957913U (en) | 2016-03-22 | 2016-03-22 | Two -dimentional strain detection's in surface star fiber grating foil gage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620237856.5U CN205957913U (en) | 2016-03-22 | 2016-03-22 | Two -dimentional strain detection's in surface star fiber grating foil gage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205957913U true CN205957913U (en) | 2017-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620237856.5U Expired - Fee Related CN205957913U (en) | 2016-03-22 | 2016-03-22 | Two -dimentional strain detection's in surface star fiber grating foil gage |
Country Status (1)
| Country | Link |
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| CN (1) | CN205957913U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990837A (en) * | 2017-12-14 | 2018-05-04 | 北京遥测技术研究所 | A kind of fiber Bragg grating strain sensor |
| CN110530282A (en) * | 2019-09-04 | 2019-12-03 | 苏州热工研究院有限公司 | Three spindle-type fiber grating strain measurement sensors of adjustable sensitivity |
-
2016
- 2016-03-22 CN CN201620237856.5U patent/CN205957913U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990837A (en) * | 2017-12-14 | 2018-05-04 | 北京遥测技术研究所 | A kind of fiber Bragg grating strain sensor |
| CN110530282A (en) * | 2019-09-04 | 2019-12-03 | 苏州热工研究院有限公司 | Three spindle-type fiber grating strain measurement sensors of adjustable sensitivity |
| CN110530282B (en) * | 2019-09-04 | 2022-04-01 | 苏州热工研究院有限公司 | Three-axis fiber grating strain measurement sensor with adjustable sensitivity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170215 Termination date: 20180322 |