CN106767483A - Optical fibre grating three-dimensional strain transducer based on elliptical ring - Google Patents
Optical fibre grating three-dimensional strain transducer based on elliptical ring Download PDFInfo
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- CN106767483A CN106767483A CN201710034212.5A CN201710034212A CN106767483A CN 106767483 A CN106767483 A CN 106767483A CN 201710034212 A CN201710034212 A CN 201710034212A CN 106767483 A CN106767483 A CN 106767483A
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- strain
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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
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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Abstract
The invention discloses a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring, including：Place three strain ellipse rings of center superposition respectively in three planes of right angle three-dimensional system of coordinate, described each strain ellipse ring includes elliptical ring and strain sensitive radial girders, the strain sensitive radial girders are connected with strain ellipse ring, fiber grating is laid on the strain sensitive radial girders surface, and the optical fiber pigtail is drawn from the anchoring mouthful of strain sensitive radial girders one end.Beneficial effect of the present invention：The enclosed inside of fiber grating is realized by elliptical ring and carrier bar integral structure, the differently strained transmission in three directions is realized using ellipse strain ring, the measurement of strain can be realized, the direction of strain can be told again, and the sensor bulk is smaller, measured while easily realizing that smaller space three-dimensional is strained.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, more particularly to a kind of optical fibre grating three-dimensional strain based on elliptical ring is passed
Sensor.
Background technology
Fiber-optic grating sensor has size small, lightweight, electromagnetism interference, and durability waits other type sensors not well
The advantage for possessing, in recent years fiber-optic grating sensor be widely applied.Fiber Bragg grating strain sensor is in Aero-Space, big
The extensive use of each engineering field such as type electromechanical equipment, bridge construction has simultaneously played important function.As Lee passes through optical fiber light to China
Grid realize the internal stress measuring of D braided composites structure；Carlos Rodrigues should by surface-mount type fiber grating
Become the measurement that meter realizes the strain of bridge structure service phase.
In terms of optical fibre grating three-dimensional strain measurement, the A of Chinese patent CN 102175366 pass through three optical fiber grating sensings
Device matrix material three-dimensional the measurement that realizes rock three-dimensional stress constraint of being disposed vertically, but the stress measurement mode sheet
Body needs to paste multiple sensors, and sensor is pasted on rock matrix outer surface, and sensor is not taken effectively
Safeguard measure, inevitably causes damage during embedded sensor to it.In recent years, fiber Bragg grating strain sensor has obtained good
Good development, but the research of three-dimensional strain sensor and application seldom report.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring,
The sensor realizes the enclosed inside of fiber grating by elliptical ring and carrier bar integral structure, is realized using ellipse strain ring
The differently strained transmission in three directions, can realize the measurement of strain, and the direction of strain, and the sensor body can be told again
Product is smaller, is measured while easily realizing that smaller space three-dimensional is strained.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of optical fibre grating three-dimensional strain transducer based on elliptical ring, including：Three in three-dimensional cartesian coordinate system are mutual
Three strain ellipse rings of center superposition are placed in perpendicular plane respectively, described each strain ellipse ring includes elliptical ring
With strain sensitive radial girders, the strain sensitive radial girders and strain ellipse ring anchor connection, the strain sensitive radial girders table
Fiber grating is laid in face, and the optical fiber pigtail is drawn from the anchoring mouthful of strain sensitive radial girders one end.
The strain sensitive radial girders are parallel with the plane where strain ellipse ring.
The size of three strain ellipse rings is different, with realize center superposition three strain ellipse rings it is mutual
It is disposed vertically.
The fiber grating laid in described each strain sensitive radial girders is connected in series after drawing.
The radial thickness of the strain ellipse ring and oval ring thickness are adjustable, the measurement range of stress of three-dimensional strain sensor
Realized by the radial thickness and oval ring thickness that adjust strain ellipse ring.
Strain sensitive radial girders selection carbon fiber board as matrix, fiber grating by ECA with
Strain sensitive beam is connected, and the centre wavelength of three fiber gratings that three strain ellipse rings are selected is different, prevents optical fiber light
Grid series connection postwave mutual interference effect measurement result long.
After the optical fiber pigtail is drawn from one end of strain ellipse ring, optical fiber pigtail is by optical branching device and light source and wavelength
Demodulated equipment is connected.
The beneficial effects of the invention are as follows：
Optical fibre grating three-dimensional strain transducer of the present invention based on oval annulus, it is sensitive first as core using fiber grating
Part, the transmission of three dimensional strain is realized using center superposition and orthogonal three elliptical rings, by the folded of three stain vectors
Plus realize the measurement of three dimensional strain.
The enclosed inside of fiber grating is realized by elliptical ring and carrier bar integral structure, is realized using ellipse strain ring
The differently strained transmission in three directions, can realize the measurement of strain, and the direction of strain, and the sensor body can be told again
Product is smaller, is measured while easily realizing that smaller space three-dimensional is strained.
Brief description of the drawings
Fig. 1 is the three dimensional structure diagram of three-dimensional strain sensor；
Fig. 2 is the front view of strain ellipse ring；
Fig. 3 is the strain sensitive radial girders schematic diagram of strain ellipse ring；
Fig. 4 be fixed world stress under, strain ellipse ring radial thickness with strain corresponding relation.
Wherein, 1. strain ellipse ring one, 2. strain ellipse ring two, 3. strain ellipse ring three, the 4. strain of strain ellipse ring
Sensitive radial girders, 5. fiber grating, 6. optical fiber pigtail, 7. light source, 8. optical fiber demodulating apparatus.
Specific embodiment：
The present invention will be further described with embodiment below in conjunction with the accompanying drawings：
Optical fibre grating three-dimensional strain transducer based on oval annulus of the present invention is as shown in Figure 1.The sensor main
To include center superposition and orthogonal three strain ellipse rings.As shown in Figures 2 and 3, strain ellipse ring includes radially thick
Degree and the adjustable elliptical ring of thickness and surface lay the strain sensitive radial girders 4 of fiber grating 5, three strain sensitive radial girders 4
Respectively with the x of coordinate system, y, z coordinate axle is parallel, anchor of the optical fiber pigtail 6 from one end of strain sensitive radial girders 4 of strain ellipse ring
Gu Kou draws and is connected with light source 7 and Wavelength demodulation equipment 8.
The strain sensitive radial girders 4 of strain ellipse ring to select carbon fiber board as matrix, from alpha-cyanoacrylate second
Ester is used as fiber grating 5 and the adhesive of strain beam.To avoid the related interference effect measurement measurement long of the series connection postwave of fiber grating 5
The accuracy of result, the centre wavelength of fiber grating 5 selected by strain ellipse ring is different.
The radial thickness of strain ellipse ring and oval ring thickness are adjustable, and the measurement range of stress of three-dimensional strain sensor passes through
The radial thickness and oval ring thickness for adjusting strain ellipse ring are realized.Under fixed world stress, strain ellipse ring is radially
Thickness is as shown in Figure 4 with the corresponding relation of strain.
Sensor measuring principle is further described below：When extraneous stress act on strain ellipse ring 1, strain ellipse
The strain sensitive radial girders 4 of ring are influenceed to produce strain by extraneous stress, and then change the centre wavelength of fiber grating 5.It is logical
The change of the demodulating fiber bragg grating centre wavelength of fiber optic wavelength demodulated equipment 8 is crossed, so as to measure outside correspondence elliptical ring 1 place direction
The strain value ε of boundary's stress1.Similarly, the strain value in strain ellipse ring 22 and its place direction of the measurement of strain ellipse ring 33 is ε2,
ε3.Because the strain measured by strain ellipse ring has directionality, three dimensions residing for sensor can be obtained by the superposition of vector
Interior strain value.
Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (7)
1. a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring, it is characterized in that, including：At three of three-dimensional system of coordinate
Three strain ellipse rings of center superposition are placed in plane respectively, described each strain ellipse ring includes that elliptical ring and strain are quick
Sense radial girders, the strain sensitive radial girders and strain ellipse ring anchor connection, light is laid on the strain sensitive radial girders surface
Fine grating, the optical fiber pigtail is drawn from the anchoring mouthful of strain sensitive radial girders one end.
2. a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring as claimed in claim 1, it is characterized in that, it is described should
Become sensitive radial girders parallel with the plane where strain ellipse ring.
3. a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring as claimed in claim 1, it is characterized in that, described three
Different three elliptical rings to realize center superposition of size of individual strain ellipse ring be mutually perpendicular to place.
4. a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring as claimed in claim 1, it is characterized in that, it is described every
The fiber grating laid in one strain sensitive radial girders is connected in series after drawing.
5. a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring as claimed in claim 1, it is characterized in that, it is described should
The radial thickness of variation ellipse ring and oval ring thickness are adjustable, and the measurement range of stress of three-dimensional strain sensor is ellipse by adjusting strain
The radial thickness of annulus and oval ring thickness are realized.
6. a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring as claimed in claim 1, it is characterized in that, it is described should
Become sensitive radial girders selection carbon fiber board as matrix, fiber grating passes through ECA and strain sensitive beam phase
Even, the centre wavelength of three fiber gratings that three strain ellipse rings are selected is different, wavelength after preventing fiber grating from connecting
Interfere influence measurement result.
7. a kind of optical fibre grating three-dimensional strain transducer based on elliptical ring as claimed in claim 1, it is characterized in that, the light
After fine tail optical fiber is drawn from one end of strain ellipse ring, optical fiber pigtail is connected by optical branching device with light source and Wavelength demodulation equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034212.5A CN106767483A (en) | 2017-01-18 | 2017-01-18 | Optical fibre grating three-dimensional strain transducer based on elliptical ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034212.5A CN106767483A (en) | 2017-01-18 | 2017-01-18 | Optical fibre grating three-dimensional strain transducer based on elliptical ring |
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| Publication Number | Publication Date |
|---|---|
| CN106767483A true CN106767483A (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710034212.5A Pending CN106767483A (en) | 2017-01-18 | 2017-01-18 | Optical fibre grating three-dimensional strain transducer based on elliptical ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576302A (en) * | 2017-09-08 | 2018-01-12 | 中国地震局地壳应力研究所 | A kind of spherical shell type three dimensional strain observation procedure |
| CN108036769A (en) * | 2018-01-11 | 2018-05-15 | 盐城工学院 | A kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2385325Y (en) * | 1999-08-27 | 2000-06-28 | 重庆大学 | Force cell |
| JP2003513228A (en) * | 1999-08-03 | 2003-04-08 | コリア アドバンスト インスティテュート オブ サイエンス アンド テクノロジー | Optical fiber structure deformation sensing system |
| CN104677302A (en) * | 2015-03-24 | 2015-06-03 | 北京航空航天大学 | Three-dimensional sensor based on fiber bragg grating and sensor main body of three-dimensional sensor |
| CN206430704U (en) * | 2017-01-18 | 2017-08-22 | 山东大学 | Optical fibre grating three-dimensional strain transducer based on elliptical ring |
-
2017
- 2017-01-18 CN CN201710034212.5A patent/CN106767483A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003513228A (en) * | 1999-08-03 | 2003-04-08 | コリア アドバンスト インスティテュート オブ サイエンス アンド テクノロジー | Optical fiber structure deformation sensing system |
| CN2385325Y (en) * | 1999-08-27 | 2000-06-28 | 重庆大学 | Force cell |
| CN104677302A (en) * | 2015-03-24 | 2015-06-03 | 北京航空航天大学 | Three-dimensional sensor based on fiber bragg grating and sensor main body of three-dimensional sensor |
| CN206430704U (en) * | 2017-01-18 | 2017-08-22 | 山东大学 | Optical fibre grating three-dimensional strain transducer based on elliptical ring |
Non-Patent Citations (1)
| Title |
|---|
| 蒋善超: "光纤Bragg光栅监测系统研制优化及其边坡工程应用研究", 《中国博士学位论文全文数据库 基础科学辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576302A (en) * | 2017-09-08 | 2018-01-12 | 中国地震局地壳应力研究所 | A kind of spherical shell type three dimensional strain observation procedure |
| CN108036769A (en) * | 2018-01-11 | 2018-05-15 | 盐城工学院 | A kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor |
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