CN205373660U - Embedded spherical structure's long period fiber grating camber sensor - Google Patents
Embedded spherical structure's long period fiber grating camber sensor Download PDFInfo
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- CN205373660U CN205373660U CN201521096323.1U CN201521096323U CN205373660U CN 205373660 U CN205373660 U CN 205373660U CN 201521096323 U CN201521096323 U CN 201521096323U CN 205373660 U CN205373660 U CN 205373660U
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Abstract
The utility model discloses an embedded spherical structure's long period fiber grating camber sensor, it comprises broadband light source, incident single mode fiber, long period fiber grating, optic fibre spherical structure, outgoing single mode fiber, spectral analysis appearance. When external environment changed like camber, long period fiber grating's cycle and embedded spherical structure's circularity all changed thereupon, and stack effect that both change, the transmitted spectrum harmonic peak drift volume that leads to the sensor be far above traditional long period fiber grating, and the drift volume through peak wavelength in the monitoring transmitted spectrum can realize the measurement of camber, and the effect that superposes simultaneously can improve measuring sensitivity. This embedded spherical structure's long period fiber bragg grating sensor utensil has sensitivity high, makes advantages such as simple, with low costs.
Description
Technical field
This utility model relates to a kind of Fibre Optical Sensor, particularly relates to LPFG (LPG) curvature sensor of a kind of embedded spherical structure.
Background technology
The curvature defomation of structure, as an important parameter, generally adopted the mode indirectly measured to obtain in the past, particularly as follows: first with the strain on strain gauge measurement structure surface, extrapolate by the curvature of geodesic structure further according to the relation between strain and curvature.This method is complex, and range of application is limited, and when measuring bigger flexural deformation, strain gauge is difficult to restore to the original state after stretching, thus cannot measure bigger flexural deformation.
Along with the development of optical fiber technology, Curvature Optical Fiber Sensor is also developed rapidly, and its cost is low, and precision is high, it may be achieved the advantages such as the measurement of deep camber so that it replaces just gradually and is calculated as main indirect measurement method with strain.Common Curvature Optical Fiber Sensor, as drawn the curvature sensor of cone, simple in construction based on optical fiber, but sensitivity is relatively low, and sensor fragility is easily broken；Based on the curvature sensor of photonic crystal dislocation welding process, sensitivity is higher, but cost is also higher, and welding difficulty；These above-mentioned Curvature Optical Fiber Sensors are all restricted in actual applications.
Sensitivity in order to solve above-mentioned Curvature Optical Fiber Sensor is low, sensing head is fragile, high in cost of production shortcoming, and this utility model devises the LPFG structure of a kind of embedded spherical structure to carry out sensing and the measurement of curvature.When such as curvature changes external environment, the cycle of LPFG and the circularity of embedded spherical structure all both change therewith, the Overlay of both changes, cause that the transmitted spectrum resonance peak drift value of sensor is far above traditional LPFG, realizing the measurement of curvature by monitoring the drift value of resonance peak peak wavelength in transmitted spectrum, both Overlays improve the sensitivity of measurement simultaneously.This embedded spherical structure long-period fiber grating sensor has highly sensitive, simple in construction, low cost and other advantages.
Summary of the invention
The purpose of this utility model is in that to provide the LPFG curvature sensor of a kind of embedded spherical structure, and this sensor production is simple, compact conformation, and cost is low and sensitivity is much better than traditional common LPFG.
The technical scheme that this utility model adopts is:
A kind of LPFG curvature sensor of embedded spherical structure, including: wideband light source (1), incident single-mode fiber (2), LPFG (3), optical fiber spherical structure (4), outgoing single-mode fiber (5), spectroanalysis instrument (6)；The input of wideband light source (1) is connected with one end of incident single-mode fiber (2), the other end of incident single-mode fiber (2) is connected with one end of LPFG (3), the other end of LPFG (3) is connected with one end of outgoing single-mode fiber (5), the other end of outgoing single-mode fiber (5) is connected with spectroanalysis instrument (6), embeds optical fiber spherical structure (4) in the middle of LPFG (3).
The LPFG curvature sensor of described a kind of embedded spherical structure, it is characterised in that embedded optical fiber spherical structure (4) is in the center of LPFG (3), and its diameter is 187 μm-207 μm.
The LPFG curvature sensor of described a kind of embedded spherical structure, it is characterised in that embedded optical fiber spherical structure (4) is in the center of LPFG (3), and its diameter is 187 μm-207 μm.
Operation principle of the present utility model is: the light that wideband light source 1 sends enters the LPFG 3 of embedded spherical structure 4 after passing through incident single-mode fiber 2 after, light transmits respectively in fibre core and covering, last except the light of loss in covering, all the other are exported by outgoing single-mode fiber.When the curvature of the LPFG of optical fiber built-in spherical structure 4 changes time, LPFG 3-In each refractive index cross-section run-off the straight modulated, cause that its equivalent period changes.Resonance wavelength is expressed as:
λD=(nco-ncl)Λ(1)
Wherein λDFor the resonance peak of LPFG, ncoFor the effective refractive index of fibre core, nclFor the effective refractive index of covering, Λ is the cycle of LPFG.By formula it can be seen that output wavelength is drifted about with the change in cycle.
The change of this extrinsic curvature causes that the circularity of optical fiber built-in spherical structure 4 also changes, and its Joint effect superposed with LPFG is expressed as:
Wherein, λSFor the coefficient resonance wavelength of embedded spherical structure and LPFG, d is LPFG constant, and i is beam incident angle, and θ is optical grating diffraction angle, changes with the change of spherical structure circularity, ultimately results in the drift by a relatively large margin of output wavelength.
The beneficial effects of the utility model are: sensor head construction is simple, it is only necessary to common optical fiber splicer and CO2Laser instrument；Sensing head cost is low, it is only necessary to common single-mode fiber；Sensing head is highly sensitive, and Curvature varying causes that the cycle of LPFG and the circularity of embedded spherical structure all change, the Overlay of both changes, increases the drift value at spectral resonance peak, improves measurement sensitivity.
Accompanying drawing explanation
Fig. 1 is the structural representation of the LPFG curvature sensor of a kind of embedded spherical structure；
Fig. 2 is sensor resonant wavelength of the present utility model and tested curvature relationship schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing and experiment embodiment, this utility model is described further:
In Fig. 1, the LPFG curvature sensor of a kind of embedded spherical structure, including wideband light source 1, incident single-mode fiber 2, LPFG 3, optical fiber spherical structure 4, outgoing single-mode fiber 5, spectroanalysis instrument 6；The input of wideband light source 1 is connected with one end end of incident single-mode fiber 2, the incident other end of single-mode fiber 2 is connected with one end of LPFG 3, the middle-end of LPFG 3 embeds optical fiber spherical structure 4, the other end of LPFG 3 is connected with one end of outgoing single-mode fiber 5, and the other end of outgoing single-mode fiber 5 is connected with the input of spectroanalysis instrument 6.
The LPFG curvature sensor of above-mentioned a kind of embedded spherical structure, it is characterised in that embedded optical fiber spherical structure (4) is in the center of LPFG (3), and its diameter is 187 μm-207 μm；The cycle of LPFG (3) is 605 μm, and length is 24mm, and transmission spectrum is adjustable at 1200nm-1600nm.
A kind of LPFG curvature sensor of embedded spherical structure, its working method is: the centre wavelength of wideband light source 1 is 1550 nanometers, when its light sent is by entering LPFG 3 after incident single-mode fiber 2, a part of light enters the covering of LPFG 3, excites cladding mode to transmit in the covering of LPFG 3；Another part light is maintained in fibre core and transmits, light in fibre core is when optical fiber spherical structure 4, a part of light is continually maintained in fibre core and transmits, and another part light enters the covering of optical fiber spherical structure 4, produces new cladding mode with the light combined effect in LPFG 3 covering.When the optical transport in fibre core and covering to outgoing single mode 5, the light of fibre core and covering meets, and produces the resonance peak of specific wavelength.When extraneous curvature changes, the cycle of LPFG and the circularity of embedded spherical structure all change therewith, the Overlay of both changes, cause that the resonance peak of sensor transmitted spectrum drifts about.Fig. 2 is the relation schematic diagram of tested Curvature varying and resonance wavelength, and curvature measurement ranges for 0-0.71m-1, sensitivity is up to-104nm/m-1。
Claims (3)
1. a LPFG curvature sensor for embedded spherical structure, including: wideband light source (1), incident single-mode fiber (2), LPFG (3), optical fiber spherical structure (4), outgoing single-mode fiber (5), spectroanalysis instrument (6)；The outfan of wideband light source (1) is connected with one end of incident single-mode fiber (2), the other end of incident single-mode fiber (2) is connected with one end of LPFG (3), the other end of LPFG (3) is connected with one end of outgoing single-mode fiber (5), the other end of outgoing single-mode fiber (5) is connected with spectroanalysis instrument (6), embeds optical fiber spherical structure (4) in the middle of LPFG (3).
2. the LPFG curvature sensor of a kind of embedded spherical structure according to claim 1, it is characterized in that embedded optical fiber spherical structure (4) is in the center of LPFG (3), its diameter is 187 μm-207 μm.
3. the LPFG curvature sensor of a kind of embedded spherical structure according to claim 1, it is characterized in that the cycle of described LPFG (3) is 605 μm, length is 24mm, and transmitted spectrum wave band is adjustable at 1200nm-1600nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521096323.1U CN205373660U (en) | 2015-12-23 | 2015-12-23 | Embedded spherical structure's long period fiber grating camber sensor |
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| CN201521096323.1U CN205373660U (en) | 2015-12-23 | 2015-12-23 | Embedded spherical structure's long period fiber grating camber sensor |
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| CN205373660U true CN205373660U (en) | 2016-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
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| C14 | Grant of patent or utility model | ||
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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: 20160706 Termination date: 20171223 |