CN205785094U - A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure - Google Patents
A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure Download PDFInfo
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- CN205785094U CN205785094U CN201620435603.9U CN201620435603U CN205785094U CN 205785094 U CN205785094 U CN 205785094U CN 201620435603 U CN201620435603 U CN 201620435603U CN 205785094 U CN205785094 U CN 205785094U
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Abstract
This utility model is a kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure, belongs to fiber grating sensing technology field, for measuring the three dimensional strain within building body.Positive tetrahedron optical fibre grating three-dimensional strain detecting structure described in the utility model is made up of the super-elastic metal component of positive tetrahedron shape and the bragg grating of six different wave lengths, and the Bragg grating that these six characteristic wavelengths differ uses epoxy type adhesive to be fixed on six ribs of structure.Need to be by inside optical fibre grating three-dimensional strain detecting structure embedment building body during application.The line strain in six rib each directions can be obtained again by the change of monitoring fiber grating eigenvalue, then by the internal conventional strain regime of building body can be calculated, to realize the purpose of measurement building body internal strain with the mapping relations of conventional strain regime.
Description
Technical field
The invention belongs to fiber grating sensing technology field, particularly to a kind of light detecting the strain of building body interior three-dimensional
Fine optical grating construction body, this structure is made up of positive tetrahedron super-elastic metal component and six bragg gratings, is used for building
Three dimensional strain detection within building body.
Background technology
Fiber grating is one of fiber optic passive device with the fastest developing speed recent years, and fiber grating is to utilize optical fiber material
The heliosensitivity of material, writes fibre core by the method for uv-exposure by incident illumination coherent field pattern, produces along fibre core axle in fibre core
To refractive index periodic change, thus form the phase grating in permanent space, its effect is substantially formed in fibre core
(transmission or reflection) wave filter of one arrowband or reflecting mirror.Owing to grating fibers has, volume is little, electromagnetism interference, detection essence
Degree is high and is prone to imbed the advantages such as structure of intelligence, and its resonance wavelength is to external environments such as temperature, strain, refractive index, concentration
Change more sensitive, be therefore widely used in technical field of optical fiber sensing.
The strain regime of object depends on the build-in attribute of material and suffered stress state.Root is usually needed in engineering
According to test indexs such as ess-strains, the duty of material is studied and assessed.Strain within building body to be determined
State, needs to be described with 3 normal strains and 3 shearing strains, i.e. it needs to be determined that the components of strain on 6 different directions, also
I.e. need 6 strain detecting devices.Theoretically, for determining three dimensional strain state, 6 strain device can use multiple not
Same three dimensional strain floral structure.
At present, three dimensional strain state or stress state within building body may often be such that according to Theoretical Calculation acquisition.Due to
Discontinuity of material, Theoretical Calculation often error is bigger.In order to obtain real stress and strain state, it is necessary to stress
The strain regime in internal portion directly detects.Therefore, the detection of building body interior three-dimensional strain regime needs reasonable in design
Strain detecting structure.
Summary of the invention
It is an object of the invention to detection three dimensional strain state within building body, design a kind of fiber grating strain detection
Structure, it is possible to building body inside is carried out three dimensional strain detection.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure, by positive tetrahedron highly elastic material structure and six
Bragg grating (FBG) composition of three-dimensional layout.
Highly elastic material structure, described highly elastic material component is positive tetrahedron, and described highly elastic material component has six
Rib, for 30mm to 50mm, cross-sectional width is 2mm, and height is 2mm, and every described rib is both provided with mounting groove；
Bragg grating, described bragg grating has 6, the characteristic wave of described bragg grating
Long difference, described bragg grating is fixed in described mounting groove.
Described right-angle prismatic cone optical fiber grating structure body, described mounting groove width is 0.5mm, and the degree of depth is 1mm.
Described right-angle prismatic cone optical fiber grating structure body, described bragg grating uses epoxy type adhesive solid
It is scheduled in described mounting groove.
Accompanying drawing explanation
Fig. 1 is positive tetrahedron high-elastic structure body schematic diagram of the present invention.
Fig. 2 is the sectional view of the rib of positive tetrahedron high-elastic structure body of the present invention.
Detailed description of the invention
The present invention is a kind of positive tetrahedron high-elastic structure body that can detect the strain of building body interior three-dimensional, below
Will be in conjunction with Fig. 1, the invention will be further described.
For three dimensional strain detection fiber optical grating construction body, by positive tetrahedron highly elastic material structure and six three-dimensional layouts
Bragg grating (FBG) composition.
Described positive tetrahedron high-elastic structure material should select high resiliency and corrosion-resistant material, can use stainless
Steel, aluminium alloy or elastic polymer material.
Described positive tetrahedron high-elastic structure body OABC has six ribs OA, OB, OC, AC, BC and AB, as shown in Figure 1.
Described a length of 30mm to the 50mm of rib OA, OB, OC, AC, BC and AB, the cross section of rib is as it can be seen, cross-sectional width
For 2mm, height is 2mm, and every rib is opened the fiber grating mounting groove that 1mm is deep, 0.5mm is wide.
The bragg grating of described six roots of sensation different characteristic wavelength uses epoxy type adhesive (such as Epo-
Tek353ND) being fixed on mounting groove, bragg grating 1,2,3 is separately fixed on OA, OB, OC, bragg fiber light
Grid 4,5,6 are separately fixed on AB, BC, CA.Bragg grating, when being fixed, must have suitable stretching, to ensure
The two-way strain of bragg grating energy detection means, uses epoxy type gluing after bragg fiber is fixed in mounting groove
Mounting groove is filled in agent, to play the protective effect to bragg grating.
It is embodied as step as follows:
Step one: make high-elastic structure body
The highly elastic material such as aluminium alloy or rustless steel is selected to make corresponding construction according to size as required.And high-elastic
Carve, on six ribs of property material structure, the fiber grating mounting groove that 0.5mm is deep, 0.5mm is wide one.
Step 2: fixing bragg grating
Use epoxy type adhesive that the bragg grating of six roots of sensation different characteristic wavelength is fixed on fiber grating to install
In groove.
Step 3: by the way of filling epoxy type adhesive, fiber grating is fixed on positive tetrahedron high-elastic structure body
The inside of rib play the effect of protection fiber grating.
Step 4: the positive tetrahedron high-elastic structure body securing fiber grating is imbedded the inside of building body, by reading
Take characteristic wavelength and calculate the line strain ε of respective directioni={ ε1, ε2, ε3, ε4, ε5, ε6, general strain regime of certain point can be from
Following methods calculates:
Consider from ordinary circumstance, straight line OA in three dimensions, this straight line deflection cosine 1 in xyz direction, m, n
It is respectively as follows:
N=cos δ
In formula: δ is the angle of straight line and z-axis；Angle for the straight line projection in plane xOy Yu x-axis.If it is more known
Strain regime be
εj={ εxεyεzεxyεyzεzx}
Then the line strain in OA direction is
ε=εxl2+εym2+εzn2+εzylm+εyzmn+εzxnl
That is, if it is known that the strain regime of a bit, then the line strain of any direction all can be obtained by above formula.Accordingly
, if the line strain on known 6 different directions, then conventional strain regime can also obtain.If on known 6 different directions
Line strain is respectively
I=1 in formula, 2,3,4,5,6.By the mapping relations of conventional strain regime to different directions line strain it is
{εi}=T{ εj}
Then { εj}=T-1{εi}
In formula: j=x, y, z, xy, yz, zx；εi={ ε1, ε2, ε3, ε4, ε5, ε6, according to positive tetrahedron direction cosines, can
In the hope of
Then
The conventional strain regime of the internal certain point of building body is can be obtained by by conversion.
Claims (3)
1. a positive tetrahedron optical fibre grating three-dimensional strain detecting structure, it is characterised in that including:
Highly elastic material structure, described highly elastic material component is positive tetrahedron, and described highly elastic material component has six ribs, for
30mm to 50mm, cross-sectional width is 2mm, and height is 2mm, and every described rib is both provided with mounting groove；
Bragg grating, described bragg grating has 6, and the characteristic wavelength of described bragg grating is not
With, described bragg grating is fixed in described mounting groove.
Right-angle prismatic the most according to claim 1 cone optical fiber grating structure body, it is characterised in that described mounting groove width
For 0.5mm, the degree of depth is 1mm.
Right-angle prismatic the most according to claim 1 cone optical fiber grating structure body, it is characterised in that described bragg fiber
Grating uses epoxy type adhesive to be fixed in described mounting groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620435603.9U CN205785094U (en) | 2016-05-12 | 2016-05-12 | A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620435603.9U CN205785094U (en) | 2016-05-12 | 2016-05-12 | A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure |
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| CN201620435603.9U Expired - Fee Related CN205785094U (en) | 2016-05-12 | 2016-05-12 | A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356351A (en) * | 2017-07-17 | 2017-11-17 | 兰州大学 | A kind of grating flower Multifunction Sensor used under extreme low temperature environment |
| CN111189405A (en) * | 2020-01-13 | 2020-05-22 | 哈尔滨工业大学 | Fiber grating string three-dimensional space strain sensor for road |
-
2016
- 2016-05-12 CN CN201620435603.9U patent/CN205785094U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356351A (en) * | 2017-07-17 | 2017-11-17 | 兰州大学 | A kind of grating flower Multifunction Sensor used under extreme low temperature environment |
| CN107356351B (en) * | 2017-07-17 | 2023-08-01 | 兰州大学 | Grating flower multifunctional sensor used in extremely low temperature environment |
| CN111189405A (en) * | 2020-01-13 | 2020-05-22 | 哈尔滨工业大学 | Fiber grating string three-dimensional space strain sensor for road |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 Termination date: 20170512 |
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| CF01 | Termination of patent right due to non-payment of annual fee |