CN206618392U - A kind of bend sensor based on LPFG - Google Patents
A kind of bend sensor based on LPFG Download PDFInfo
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- CN206618392U CN206618392U CN201720306925.8U CN201720306925U CN206618392U CN 206618392 U CN206618392 U CN 206618392U CN 201720306925 U CN201720306925 U CN 201720306925U CN 206618392 U CN206618392 U CN 206618392U
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- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a kind of bend sensor based on LPFG, including：Wideband light source, single-mode fiber, LPFG, photodetector.Single-mode fiber includes the first single-mode fiber and the second single-mode fiber；Wideband light source is connected to LPFG by the first single-mode fiber；Photodetector is connected to LPFG by the second single-mode fiber；Using LPFG as sensor, compared to common Bragg optical-fiber grating sensor, it effectively increases the sensitivity of sensor, and the grid region structure of LPFG is helical structure, effectively reduces Polarization Dependent Loss.The surface of LPFG is coated with the viscoelastic graphene polymer nano composite material G Putty that thickness is 2mm, effectively protects optical grating construction while further increasing the sensitivity of sensor, increases the service life.
Description
Technical field
The present invention provides a kind of bend sensor, more particularly to a kind of optical fibre bending sensor.
Background technology
Optical fibre bending sensor is most widely used in engineering field, one of technology most ripe fibre optical sensor.Optical fiber
Bend sensor is as a kind of new bend sensor technology, with anti-electromagnetic interference capability is strong, corrosion-resistant, light weight and body
The advantages of product is small, causes the great interest of people in recent years.Have in fields such as oil, the energy, medicine, aviation, nuclear industry
And be widely applied, for ensure main facilities safely, prevent pernicious and catastrophic failure from having very important significance.
The such as A of Publication No. CN 106917343, patent name be a kind of optical fibre bending sensor with the air gap and
The Chinese invention patent of flexural measurement method, discloses a kind of optical fibre bending sensor with the air gap, and it uses single mode rank
Jump optical fiber, and opens up the gap of an one fixed width and depth on the top of optical fiber, constitutes the fibre-optical bending with the air gap and passes
Sensor, the optical fibre bending sensor with the air gap is pasted onto in measurement structure, openend laterally, when optical fiber follows measurement
When structure bends, with the change of angle of bend, also changed by the light intensity of this air gap, it is logical by measurement
The light intensity attenuation for crossing the air gap obtains the bending radius of measurement structure.It can be with direct measurement light intensity, it is not necessary to expensive light
The equipment such as spectrometer, while improving measurement sensitivity.Have the drawback that：The gap on optical fiber top when angle of bend is excessive
Veiling glare in easy fracture, and air easily produces influence to measurement result.
Publication No. CN 203785642A for another example, patent name is a kind of all -fiber bending based on peanut shaped structure
The Chinese invention patent of sensor, discloses a kind of all -fiber bend sensor based on peanut shaped structure, and it is by Prague light
Fine grating serves as speculum, and the sensing head of sensor is constituted with peanut shaped construction module, and only cladding mode power is produced using bending
Life influences and cladding mode power and bending curvature are linear, and flexural measurement is realized by measuring cladding mode power.It has
Measurement range is big, corrosion-resistant, simple in construction, temperature-insensitive the advantages of.Have the drawback that：The design of peanut structure needs spy
Fixed parameter designing, making is difficult, and bragg grating is more relatively low than the sensitivity of LPFG, etches Bradley
Lattice fiber grating is than the complex process of LPFG, and cost is higher.
The content of the invention
In order to solve above-mentioned the deficiencies in the prior art, the utility model provides a kind of bending based on LPFG
Sensor, uses LPFG and optical grating construction is helical structure, the effective sensitivity for improving sensor, effectively
Reduce Polarization Dependent Loss；Using viscoelastic graphene polymer nano composite material G-Putty, sensing is further improved
The sensitivity of device, and optical grating construction is effectively protected, make LPFG be difficult to be destroyed in measurement process.
The technical scheme that the utility model is used：A kind of bend sensor based on LPFG, including：It is wide
Band light source 1, single-mode fiber, LPFG 3, photodetector 5；Described single-mode fiber includes the first single-mode fiber 2
With the second single-mode fiber 4, described wideband light source 1 is connected to LPFG 3 by the first single-mode fiber 2, described
Photodetector 5 is connected to LPFG 3 by the second single-mode fiber 4；Characterized in that, described long period optical fiber
The grid region structure 9 of grating is helical structure.
The surface of described LPFG 3 is coated with viscoelastic graphene polymer nano composite material G-
Putty8, its thickness is 2mm.
The beneficial effects of the utility model are：
1 uses LPFG as sensor, and compared to common Bragg optical-fiber grating sensor, its is effective
The sensitivity of sensor is improved, and the grid region structure of LPFG is helical structure, is effectively reduced polarization phase
Close loss.
The surface of 2 LPFGs is coated with the nano combined material of viscoelastic graphene polymer that thickness is 2mm
Expect G-Putty, effectively protect optical grating construction while further increasing the sensitivity of sensor, extend service life.
Brief description of the drawings
Below in conjunction with the accompanying drawings and concrete mode the utility model is described in further detail.
Fig. 1 is system and device figure of the present utility model；
Fig. 2 is the grid region structure chart of LPFG of the present utility model.
In figure：1 is wideband light source, and 2 be the first single-mode fiber, and 3 be LPFG, and 4 be the second single-mode fiber, 5
It is fibre cladding for photodetector, 6,7 be fiber core, and 8 be viscoelastic graphene polymer nano composite material G-
Putty, 9 be the grid region structure of LPFG.
Embodiment
In Fig. 1 and Fig. 2, a kind of bend sensor based on LPFG, including：Wideband light source 1, single-mode optics
Fibre, LPFG 3, photodetector 5；Described single-mode fiber includes the first single-mode fiber 2 and the second single-mode fiber
4, described wideband light source 1 is connected to LPFG 3 by the first single-mode fiber 2, and described photodetector 5 passes through
Second single-mode fiber 4 is connected to LPFG 3；The grid region structure 9 of described LPFG is helical structure.
A kind of course of work of the bend sensor based on LPFG：The wave-length coverage length of wideband light source 1
For 1450nm~1650nm, the cycle of LPFG 3 is 550 μm, and pitch is 1290 μm, and spiral number of turns are 10 circles.It is viscous
The graphene polymer nano composite material G-Putty8 using plasmas enhancing chemical vapour deposition technique of elasticity is coated on length
The surface of grid region structure 9 of period optical fiber grating.Wideband light source 1 is connected to LPFG 3 by the first single-mode fiber 2,
Photodetector 5 is connected to LPFG 3 by the second single-mode fiber 4.When object under test is bent, light source is sent out
The light gone out carries out opto-electronic conversion, output data information, you can be measured by LPFG 3 into photodetector 5
The bending situation of thing carries out Quantitative Monitoring.
Claims (2)
1. a kind of bend sensor based on LPFG, including：Wideband light source（1）, single-mode fiber, long period optical fiber
Grating（3）, photodetector（5）；Described single-mode fiber includes the first single-mode fiber（2）With the second single-mode fiber（4）, it is described
Wideband light source（1）Pass through the first single-mode fiber（2）It is connected to LPFG（3）, described photodetector（5）It is logical
Cross the second single-mode fiber（4）It is connected to LPFG（3）；Characterized in that, the grid of described LPFG
Plot structure（9）For helical structure.
2. a kind of bend sensor based on LPFG according to claim 1, it is characterised in that described
LPFG（3）Surface be coated with viscoelastic graphene polymer nano composite material G-Putty8, its thickness
For 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720306925.8U CN206618392U (en) | 2017-03-24 | 2017-03-24 | A kind of bend sensor based on LPFG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720306925.8U CN206618392U (en) | 2017-03-24 | 2017-03-24 | A kind of bend sensor based on LPFG |
Publications (1)
| Publication Number | Publication Date |
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| CN206618392U true CN206618392U (en) | 2017-11-07 |
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| CN201720306925.8U Expired - Fee Related CN206618392U (en) | 2017-03-24 | 2017-03-24 | A kind of bend sensor based on LPFG |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387552A (en) * | 2018-01-18 | 2018-08-10 | 武汉理工大学 | Based on graphene SPR long-period fiber grating sensors |
| CN108801308A (en) * | 2018-08-29 | 2018-11-13 | 闫静 | A kind of fiber grating Multifunction Sensor |
| CN110133799A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | The integrated polarization photo-coupler and preparation method thereof of waveguide based on graphene |
| CN113189048A (en) * | 2021-04-27 | 2021-07-30 | 武汉理工大学 | Long-period fiber grating NH3 gas sensor based on graphene oxide/cellulose acetate |
-
2017
- 2017-03-24 CN CN201720306925.8U patent/CN206618392U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387552A (en) * | 2018-01-18 | 2018-08-10 | 武汉理工大学 | Based on graphene SPR long-period fiber grating sensors |
| CN108801308A (en) * | 2018-08-29 | 2018-11-13 | 闫静 | A kind of fiber grating Multifunction Sensor |
| CN110133799A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | The integrated polarization photo-coupler and preparation method thereof of waveguide based on graphene |
| CN113189048A (en) * | 2021-04-27 | 2021-07-30 | 武汉理工大学 | Long-period fiber grating NH3 gas sensor based on graphene oxide/cellulose acetate |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Yang Jing Document name: Notice of termination of patent |
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| 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: 20171107 Termination date: 20200324 |