CN106289600A - A kind of optical fiber stress sensor part - Google Patents
A kind of optical fiber stress sensor part Download PDFInfo
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- CN106289600A CN106289600A CN201610837857.8A CN201610837857A CN106289600A CN 106289600 A CN106289600 A CN 106289600A CN 201610837857 A CN201610837857 A CN 201610837857A CN 106289600 A CN106289600 A CN 106289600A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 89
- 239000000835 fiber Substances 0.000 claims abstract description 71
- 238000001228 spectrum Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 244000089409 Erythrina poeppigiana Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The present invention provides a kind of optical fiber stress sensor part, including the first single-mode fiber being sequentially connected with, less fundamental mode optical fibre and the second single-mode fiber；Wherein the normalized frequency of less fundamental mode optical fibre meets: 3.83171 < V < 7.01559.The present invention propose use single-mode fiber, less fundamental mode optical fibre, single-mode fiber simple combination to realize stress sensing, the complicated processing technology such as grating need not be used, and highly sensitive sensing can be obtained, compared with the sensing arrangement using multimode fibre, use that normalized frequency value is less, the sensing arrangement of the less fundamental mode optical fibre composition that pattern quantity is few is highly sensitive in optical fiber, frequency spectrum rule, it is easy to determine the parameters such as fiber lengths.
Description
Technical field
The invention belongs to Fibre Optical Sensor research field, be specifically related to a kind of optical fiber stress sensor part.
Background technology
Along with the continuation of modernization, in larger building structure down to some fine engineering structures
Monitoring system in, stress sensing is a particularly important problem in the safety monitoring of whole construction.It is known that measure
The traditional method of stress is typically along with the continuation of modernization, in larger building structure down to some
In the monitoring system of fine engineering structure, stress sensing is a particularly important problem in the safety monitoring of whole construction.
It is known that the traditional method measuring stress is typically resistance and the corresponding relation of stress reflected by resistance strain gage
Detect engineering construction.Although resistance strain gage is cheap, but its adaptability of environment bad to external world, particularly hold
Being vulnerable to the impact from electromagnetic field, can not work simultaneously in the environment of much having corrosivity, this is for being applied to engineering
The strain gauge of detection is the biggest defect.And traditional this strain gauge can only carry out spot measurement.But
From 19 century 70s, because optical-fiber type strain gauge has, the volume of general optical-fiber type sensor is little, light weight, precision
High, exempt from the advantage such as electromagnetic interference and corrosion resistance [1], thus in the evolution of strain gauge, various optical-fiber type stress
Sensor arises at the historic moment the most in succession.And wherein a lot of the most commercializations.Stress sensing structure based on optical fiber or device are
A variety of through having.Such as, based on optical fiber micro-bending structure[2]It is able to already with sensor based on Fabry-Perot fiber optic structure
Application [2-4].
In all of Fibre Optical Sensor measuring strain, it is the most extensive that sensor based on FBG structure uses.This type of
Sensor is using FBG as sensing element, and its principle is to realize measuring to the modulation of Bragg centre wavelength based on strain.The most also
The research [5] of the strain gauge of some SMS-Based optical fiber structures in succession occur, this structure uses multimode fibre, by with
The effect connecting implementation pattern interference of single-mode fiber.But, in multimode fibre, pattern quantity is many, and mode-interference effect is complicated,
It is difficult to high-precision sensing.
List of references:
[1] Peng Shiyu. the research [J] of fiber grating axial stress sensing model. Hunan Technology College's journal, 2007,20
(2):35-37。
【2】Nicholas Laoakos,Cole J,bucaro J A.Microbend fiber optic sensor
[J].Applied Optics,1987,26(11):2171-2180。
【3】Heredero R L,Santos J L,Ferndndez de Caleya R,et al..Micromachined
low-finesse Fabry-Perot interferometer for the measurement of DC and AC
electrical currents[J].Sensors Journal,IEEE,2003,3(1):13-18。
【4】Furstenau N,Schmidt M,Horack H,et al..ExtrinsicFabry-Perot
interferometer vibration and acoustic sensorsystems for airport ground
traffic monitoring[J].Optoelectronics,IEE Proceedings,1997,144(3):134-144。
【5】Wu Q,Hatta A M,Wang P,et al.Use of a bent single SMS fiber
structure for simultaneous measurement of displacement and temperature
sensing[J].IEEE Photonics Technology Letters,2011,23(2):130-132。
Summary of the invention
It is an object of the invention to provide a kind of optical fiber stress sensor part for the problems referred to above, by the first single-mode fiber,
The simple combination that less fundamental mode optical fibre and the second single-mode fiber are sequentially connected with realizes stress sensing, improves stress sensing sensitivity.
The technical scheme is that a kind of optical fiber stress sensor part, including single-mode fiber and less fundamental mode optical fibre；Described list
Mode fiber includes the first single-mode fiber and the second single-mode fiber；Described first single-mode fiber, less fundamental mode optical fibre and the second single-mode fiber
It is sequentially connected with；
The normalized frequency of described less fundamental mode optical fibre meets:
3.83171 < V < 7.01559,
Wherein, n1Represent the refractive index of less fundamental mode optical fibre fibre core；
n2Represent the refractive index of less fundamental mode optical fibre covering；
a1Represent the radius of less fundamental mode optical fibre fibre core；
λ0Represent operation wavelength.
In such scheme, the fibre core of described less fundamental mode optical fibre meets with clad refractive rate variance Δ: 0.007 >=Δ >=0.002.
In such scheme, described single-mode fiber and the lateral deviation d of less fundamental mode optical fibremMeet: dm≤0.8μm。
In such scheme, length L of described less fundamental mode optical fibre meets: L >=120mm.
In such scheme, stress acts only on less fundamental mode optical fibre.
The invention has the beneficial effects as follows: compared with prior art, the present invention proposes to use single-mode fiber, less fundamental mode optical fibre, list
The simple combination of mode fiber, to realize stress sensing, need not use the complicated processing technology such as grating, and can obtain highly sensitive
The sensing of degree.Compared with the sensing arrangement using multimode fibre, use that normalized frequency value is less, pattern quantity is few in optical fiber
The sensing arrangement of less fundamental mode optical fibre composition is highly sensitive, frequency spectrum rule, and sensing sensitivity is stable, and the less fundamental mode optical fibre length range of choice
Greatly, it is easy to determine the parameters such as fiber lengths.
Accompanying drawing explanation
Fig. 1 is the composition structural representation of a kind of fiber optic sensing device of the present invention；
Fig. 2 is the output energy change curve with less fundamental mode optical fibre length of fiber optic sensing device of the present invention, wherein (a) dcore
=25 μm, (b) dcore=40 μm, (c) dcore=50 μm；
Fig. 3 is the output energy change curve with less fundamental mode optical fibre length L of fiber optic sensing device of the present invention；
Fig. 4 is the fiber optic sensing device of the present invention output spectrum curve under different stress effects；
The optical fiber sensitivity of a Fig. 5 fiber optic sensing device of the present invention embodiment and detectable limit are long with less fundamental mode optical fibre
The graph of relation of degree；
In figure, 1. the first single-mode fiber；2. less fundamental mode optical fibre；3. the second single-mode fiber.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention
It is not limited to this.
Fig. 1 is the optical fiber structure schematic diagram of the present invention, and described optical fiber stress sensor part includes single-mode fiber and few mould light
Fine 2；Described single-mode fiber includes the first single-mode fiber 1 and the second single-mode fiber 3；Described less fundamental mode optical fibre 2 two ends connect respectively
One single-mode fiber 1 and the second single-mode fiber 3, interferes coupling mechanism, the i.e. light from the first single-mode fiber 1 input to enter into composition
Less fundamental mode optical fibre 2, inspires the pattern in less fundamental mode optical fibre 2, at less fundamental mode optical fibre 2 outfan again through the second single-mode fiber 3 implementation pattern
Relevant, the parameter such as the length of less fundamental mode optical fibre 2, core diameter, refractive index all can affect its pattern quantity excited and Energy distribution
And be coupled to the energy of single-mode fiber, thus provide good mechanism for Application in Sensing.
Fig. 2 is that less fundamental mode optical fibre 2 takes different refractivity difference and during diameter, and output energy is with the situation of change of multimode length.By
Fig. 2 (a) understands when the fibre core of less fundamental mode optical fibre is less with clad refractive rate variance Δ and diameter, and its output energy can not present the cycle
Property coupling characteristic；By Fig. 2 (c) Suo Shi, when its diameter and fibre core are excessive with clad refractive rate variance Δ, its coupled characteristic also becomes
Change irregular；By Fig. 2 (b) Suo Shi, when taking moderate value, its connecting curve presents periodic feature, and its minima region
(i.e. trough) is narrower, is conducive to obtaining high sensitivity and Detection results.Its reason is, when less fundamental mode optical fibre 2 core diameter and
When refractivity is too small, less fundamental mode optical fibre 2 is close to single mode transport, thus is difficult to form effective pattern coupling in less fundamental mode optical fibre 2
Close, and when its core diameter and fibre core are the biggest with clad refractive rate variance Δ, the pattern quantity in less fundamental mode optical fibre 2 is too much, makes
The pattern quantity that must inspire is too much, thus, its connecting curve is irregular.It is true that due to itself can be because of between fiber mode
Coupling for extraneous factor, Refractive Index Profile o deviation etc., thus, its actual coupled characteristic can be subject to more multifactorial shadow
Ring, thus be difficult to form the spectrum curve needed for sensing.As can be seen here, the less fundamental mode optical fibre 2 of suitable parameters is used to be conducive to
Mode Coupling and sensing.To this end, require that the normalized frequency of less fundamental mode optical fibre 2 meets: 3.83171 < V < 7.01559, hereWherein, n1, n2Represent fibre core and the refractive index of covering of less fundamental mode optical fibre 2 respectively；a1Represent fibre core half
Footpath, λ0For operation wavelength.I.e. optical fiber at least can be supported to transmit LP02And supported higher order mode is LP03Mould.With multimode light
Fibre generally can support that dozens or even hundreds of pattern is compared, and less fundamental mode optical fibre of the present invention only supports 4～9 patterns.Simultaneously as knot
Structure and the feature of parameter, it is only capable of being inspired 2～3 patterns, thus, its interference effect and rule obtain and promote greatly,
And the highly sensitive sensory fields of needs such as stress sensing can be applied to.
The fibre core of described less fundamental mode optical fibre 2 meets with clad refractive rate variance Δ: 0.007 >=Δ >=0.002, and its effect is to protect
Card less fundamental mode optical fibre and single-mode fiber refractive index close, to reduce its junction loss.
Fig. 3 is the output energy change curve with less fundamental mode optical fibre length.Go out at less fundamental mode optical fibre different length as shown in Figure 3
Now corresponding trough, thus when less fundamental mode optical fibre length is taken at these wave trough position, output spectrum there will be corresponding minimum.
Owing to its output energy presents periodic coupled characteristic with less fundamental mode optical fibre length, stretch if less fundamental mode optical fibre is applied stress
Or compression, then its output spectrum also can be moved, thus realizes the purpose of stress sensing.
Fig. 4 is the situation of the output spectrum change of described optical fibre device under different stress conditions.As seen from Figure 4 along with answering
When power increases with the increase of the quality of added object, the characteristic wavelength of output spectrum offsets to the right.Thereby through its frequency of detection
The amount of movement of spectral valley value just can record the stress value applied on optical fiber.
Fig. 5 is detection sensitivity and the change curve of detectable limit of a kind of embodiment of fiber optic sensing device of the present invention.
As seen from Figure 5 during the change of less fundamental mode optical fibre length, its sensitivity only keeps stable in the case of little scope fluctuates.Can also send out simultaneously
Existing detectable limit is gradually reduced along with the increase of less fundamental mode optical fibre length, and progressively tends towards stability.Thus, less fundamental mode optical fibre length should
Take higher value, thus ensure that it has less detection limits.For Fig. 5 result, the meansigma methods of its sensitivity is
0.3942nm/g, this result is higher than based on FBG structure optical fiber stress sensor about 4 times.As seen from Figure 5, described few mould
Length L of optical fiber 2 should meet: L >=120mm, i.e. uses longer less fundamental mode optical fibre, to obtain stable Detection results and highly sensitive
The detection of degree.When single-mode fiber is connected with less fundamental mode optical fibre, it connects deviation and the mode of energy inspired can be caused to vary in size, its
Final result is the detectable limit affecting optical fiber, for ensureing that it senses effect, it is desirable to described single-mode fiber and the horizontal stroke of less fundamental mode optical fibre 2
To deviation dmMeet: dm≤0.8μm。
Embodiment:
Described less fundamental mode optical fibre 2 core diameter is taken as 25 μm, fibre core and clad refractive rate variance Δ=0.0057, its output spectrum
As shown in Figure 4.Sensing sensitivity under different fiber lengths is with detectable limit as shown in Figure 5.When taking less fundamental mode optical fibre length L=
During 120mm, the meansigma methods of its sensitivity is 0.3942nm/g, and detectable limit is 16.5 × 10-6με。
It is to be understood that, although this specification describes according to each embodiment, but the most each embodiment only comprises one
Individual independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should will say
Bright book can also form those skilled in the art permissible through appropriately combined as an entirety, the technical scheme in each embodiment
Other embodiments understood.
The a series of detailed description of those listed above is only for illustrating of the possible embodiments of the present invention,
They also are not used to limit the scope of the invention, all Equivalent embodiments made without departing from skill of the present invention spirit or change
Should be included within the scope of the present invention.
Claims (5)
1. an optical fiber stress sensor part, it is characterised in that include single-mode fiber and less fundamental mode optical fibre (2)；Described single-mode fiber
Including the first single-mode fiber (1) and the second single-mode fiber (3)；Described first single-mode fiber (1), less fundamental mode optical fibre (2) and second are single
Mode fiber (3) is sequentially connected with；
The normalized frequency of described less fundamental mode optical fibre (2) meets:
3.83171 < V < 7.01559,
Wherein, n1Represent the refractive index of less fundamental mode optical fibre (2) fibre core；
n2Represent the refractive index of less fundamental mode optical fibre (2) covering；
a1Represent the radius of less fundamental mode optical fibre (2) fibre core；
λ0Represent operation wavelength.
A kind of optical fiber stress sensor part the most according to claim 1, it is characterised in that the fibre of described less fundamental mode optical fibre (2)
Core meets with clad refractive rate variance Δ: 0.007 >=Δ >=0.002.
A kind of optical fiber stress sensor part the most according to claim 1, it is characterised in that described single-mode fiber and few mould light
The lateral deviation d of fine (2)mMeet: dm≤0.8μm。
A kind of optical fiber stress sensor part the most according to claim 1, it is characterised in that the length of described less fundamental mode optical fibre (2)
Degree L meets: L >=120mm.
5. according to a kind of optical fiber stress sensor part described in any one in claim 1,2,3 or 4, it is characterised in that
Stress acts only on less fundamental mode optical fibre (2).
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| CN201610837857.8A CN106289600A (en) | 2016-09-21 | 2016-09-21 | A kind of optical fiber stress sensor part |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507477A (en) * | 2018-05-04 | 2018-09-07 | 北京交通大学 | A kind of thermal cracking sensor based on less fundamental mode optical fibre and fiber bragg grating |
| CN110006562A (en) * | 2019-02-28 | 2019-07-12 | 北京大学 | A kind of distributed optical fiber sensing system based on Mode Coupling |
| CN110307921A (en) * | 2019-07-02 | 2019-10-08 | 运城学院 | A kind of pressure sensor |
| CN114061801A (en) * | 2021-11-17 | 2022-02-18 | 重庆三峡学院 | Optical fiber V-groove cladding SPR strain sensor and manufacturing method thereof |
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| CN105928549A (en) * | 2016-06-03 | 2016-09-07 | 南京邮电大学 | Cascaded few-mode fiber-based multi-physical quantity active optical fiber sensor and sensing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108507477A (en) * | 2018-05-04 | 2018-09-07 | 北京交通大学 | A kind of thermal cracking sensor based on less fundamental mode optical fibre and fiber bragg grating |
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| CN114061801A (en) * | 2021-11-17 | 2022-02-18 | 重庆三峡学院 | Optical fiber V-groove cladding SPR strain sensor and manufacturing method thereof |
| CN114061801B (en) * | 2021-11-17 | 2023-09-26 | 重庆三峡学院 | Optical fiber V-groove type cladding SPR strain sensor and manufacturing method thereof |
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