CN104297208A - Interferometric optical fiber sensor based on pohotonic crystal optical fiber - Google Patents
Interferometric optical fiber sensor based on pohotonic crystal optical fiber Download PDFInfo
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- CN104297208A CN104297208A CN201410560810.2A CN201410560810A CN104297208A CN 104297208 A CN104297208 A CN 104297208A CN 201410560810 A CN201410560810 A CN 201410560810A CN 104297208 A CN104297208 A CN 104297208A
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Abstract
The invention discloses an interferometric optical fiber sensor based on a pohotonic crystal optical fiber. The pohotonic crystal optical fiber at the middle section is connected with monomode optical fibers at two ends via core shift connecting structures, wherein the diameters of claddings of the monomode optical fibers at two ends are 125 microns, and the diameters of fiber cores are 8.3 microns; the pohotonic crystal optical fiber at the middle section is a PM-125 type pohotonic crystal optical fiber manufactured by the fiberhome telecommunication, the cladding diameter is 125 microns, the diameter of the fiber core is 7 microns, and the length is 5cm, and the section acts as a sensing region. The interferometric optical fiber sensor is not sensitive to temperature, and is relatively high in refractive index, and can act as a refractive index sensor, and meanwhile, influences on refractive index measurement precision caused by the change of temperature can be alleviated. The interferometric optical fiber sensor based on the pohotonic crystal optical fiber is simple in structure, is easy to manufacture, meanwhile can alleviate influences on the single-parameter measurement precision by temperature, is relatively high in practical value, and is suitable for the fields of industrial production, defense-related science and technology, medical treatment, people's livehood and the like.
Description
Technical field
The invention belongs to sensory field of optic fibre, particularly relate to the interferometric optical fiber sensor of photon crystal optical fibre refractivity sensing.
Background technology
Sensing technology plays important role in the middle of modern information technologies, and along with the fast development of modern information technologies, the requirement constantly improved to sensing technology is also more and more urgent.In recent years, based on the Fibre Optical Sensor of principle of interference, because it has the advantages such as the high and structural design of sensing sensitivity is flexible, be widely used in strain, bend, the measurement of refractive index, temperature, liquid level etc.
Photonic crystal fiber (PCF) is the defective two-dimensional fundamental form of band, and than traditional fiber, it has the characteristic of many excellences.Due to the special performance of PCF, the application of PCF causes the extensive concern of researcher, and since PCF is out manufactured, the various optical device manufactured by Based PC F also more and more occur in actual applications.Researcher has proposed the multiple PCF device for measuring refractive index, such as: on PCF optical fiber, write long period processed (LPG) and Bragg grating (FBG), make Fabry-Perot interferometer (FPI) and fibre core cladding mode interferometer (Core-Cladding-Mode Interferometers, CCMIs).
The measurement of refractive index is most important in commercial measurement, but there is the cross sensitivity problem of temperature and refractive index in general Fibre Optical Sensor, can affect measuring accuracy; And the measurement sensistivity of general Fibre Optical Sensor also needs to be improved further.
Summary of the invention
The present invention seeks to obtain higher refractive index sensing sensitivity, reduce the refractive index due to the change of temperature simultaneously and measure the impact caused, provide a kind of structure simple and interfere type Photonic Crystal Fiber Sensor that is that easily make.Based on photonic crystal fiber core shift syndeton, there is interference peaks in output signal in this Fibre Optical Sensor, according to its drift value to different refractivity and temperature, can record the sensitivity of refractive index and temperature.
Interferometric optical fiber sensor based on photonic crystal fiber provided by the invention, comprises in turn: incidence end single-mode fiber (1), middle photonic crystal fiber (2) and exit end single-mode fiber (3); Described photonic crystal fiber (2) core shift that misplaces with the incidence end single-mode fiber (1) at two ends and exit end single-mode fiber (3) is respectively connected; Transmission light enters the photonic crystal fiber (2) of core shift connection through incidence end single-mode fiber (1), and the single-mode fiber (3) connected finally by output terminal core shift exports.
Incidence end single-mode fiber (1) of the present invention is 125 μm with the cladding diameter of exit end single-mode fiber (3), the diameter of fibre core is 8.3 μm, the PM-125 type photonic crystal fiber of photonic crystal fiber (2) manufactured by Fiberhome telecommunication, cladding diameter is 125 μm, core diameter is 7 μm, and length range is the preferred 5cm of 4 ~ 6cm(length); ((3) radial direction carries out the dislocation welding of small distance, and radial misalignments distance is less than or equal to 9 μm for photonic crystal fiber (2) two ends and incidence end single-mode fiber (1) and exit end single-mode fiber.
According to interference theory, light is coupled to from transfer arm incidence end single-mode fiber (1) interferes the energy of arm photonic crystal fiber (2) part to be transmitted fibre core, another part transmits in covering with the form of cladding mode, certain phase differential is there is between cladding mode and fibre core pattern, when the phase differential of fibre core pattern and cladding mode meets φ=2 π Δ nL/ λ, at second core shift weld, light in covering is coupled in the fibre core of transmission back single-mode fiber (3) and interferes, according to the drift value of interfering crest, temperature and refractive index sensitivity can be calculated, in its Chinese style, Δ n is the refringence of fibre core and covering, λ is the wavelength in vacuum, L is the length of interfering arm photonic crystal fiber.
advantage of the present invention and beneficial effect
The present invention proposes a kind of interferometric optical fiber sensor based on photonic crystal fiber, its structure is simple and be easy to make, and only core shift welding need be carried out in the two ends of photonic crystal fiber and single-mode fiber.So not sensitive to temperature according to this structure, and the sensitivity of refractive index is higher, can as index sensor, the change refractive index that simultaneously can reduce temperature measures the impact caused.This invention is based on the interferometric sensor of photonic crystal fiber, and structure is simple, and measurement sensistivity is higher, can reduce the impact of temperature on actual measurement, have higher actual application value.
Accompanying drawing explanation
Fig. 1 is this optical fibre sensor structure schematic diagram.
1. incidence end single-mode fiber, 2. photonic crystal fibers, 3. exit end single-mode fiber, 4. wideband light source, 5. spectroanalysis instrument in figure.
The photonic crystal fiber sectional view that Fig. 2 adopts for this Fibre Optical Sensor.
Fig. 3 is this optic interferometric sensor principle schematic.
Fig. 4 is the output signal spectrum of this Fibre Optical Sensor.
Fig. 5 is the matched curve figure of characteristic wavelength with variations in refractive index at this optic interferometric sensor peak.
Fig. 6 is the temperature variant matched curve figure of characteristic wavelength at this optic interferometric sensor peak.
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment
embodiment:
A kind of interferometric optical fiber sensor based on photonic crystal fiber, as shown in Figure 1, Figure 3, adopt core shift welding structure, comprise incidence end single-mode fiber (1), photonic crystal fiber (2), exit end single-mode fiber (3), wideband light source (4) and spectroanalysis instrument (5); Photonic crystal fiber (2) core shift that misplaces with the incidence end single-mode fiber (1) at two ends and exit end single-mode fiber (3) is respectively connected; The light that wideband light source (4) is launched enters the photonic crystal fiber (2) of core shift connection through incidence end single-mode fiber (1), then through the single-mode fiber (3) that output terminal core shift connects, is finally linked into spectroanalysis instrument (5).
Described incidence end single-mode fiber (1) is 125 μm with the cladding diameter of exit end single-mode fiber (3), the diameter of fibre core is 8.3 μm, the PM-125 type photonic crystal fiber of photonic crystal fiber (2) manufactured by Fiberhome telecommunication is as Fig. 2, cladding diameter is 125 μm, core diameter is 7 μm, and length chooses 5cm; Photonic crystal fiber (2) two ends and single-mode fiber (1), (3) radial direction carry out the dislocation welding of small distance, and radial misalignments distance is about 7 μm.
As Fig. 1, shown in Fig. 3, the optic path process of measuring tempeature of the present invention and refractive index is: the light of wideband light source (4) is coupled to from transfer arm single-mode fiber (1) interferes arm PCF(2) energy a part transmit fibre core, another part transmits in covering with the form of cladding mode, when cladding mode and fibre core pattern meet phase-matching condition, at second core shift weld, light in covering is coupled in the fibre core of transmission back single-mode fiber (3) and interferes, and export, the characteristic wavelength of interference peaks can be observed with temperature in spectrometer (5), the change of refractive index.Be 25 DEG C if Fig. 4 is environment temperature, when extraneous refractive index is 1.33, the interference peaks observed in spectrometer (5).When Figure 5 shows that environment temperature is 25 DEG C, optical fiber sensor head is placed in deployed sodium chloride solution, when sodium chloride solution refractive index changes to 1.38 from 1.33, the characteristic wavelength of crest is with the matched curve of variations in refractive index, and the sensitivity that can calculate this sensor refractive index is 102nm/RIU(RIU is refractive index unit).Figure 6 shows that and be fixed on temperature plate by optical fiber sensor head, when temperature is reduced to 25 DEG C from 75 DEG C, the temperature variant matched curve of characteristic wavelength of crest, the temperature control that can calculate this sensor is-8 × 10
-3nm/ DEG C.
The present invention proposes a kind of interferometric optical fiber sensor based on photonic crystal fiber, its structure is simple and be easy to make, select the photonic crystal fiber of appropriate length, core shift welding is carried out at the two ends of photonic crystal fiber and single-mode fiber, just can produce this Fibre Optical Sensor.According to the characteristic wavelength drift value of interference peaks in transmission spectrogram, temperature and refractive index sensitivity just can be obtained.This invention is less sensitive to temperature, and the sensitivity of refractive index is higher, can as index sensor, and the change refractive index that simultaneously can reduce temperature measures the impact caused.It is little that this invention has volume, and structure is simple, is easy to the advantages such as making, has higher practical value in fields such as commercial production, science and techniques of defence, the medical people's livelihood.
Claims (5)
1., based on the interferometric optical fiber sensor of photonic crystal fiber, it is characterized in that this Fibre Optical Sensor comprises in turn: enter
Penetrate end single-mode fiber (1), middle photonic crystal fiber (2) and exit end single-mode fiber (3); Described photonic crystal fiber (2) core shift that misplaces with the incidence end single-mode fiber (1) at two ends and exit end single-mode fiber (3) is respectively connected; The single-mode fiber (3) that transmission light enters core shift connection photonic crystal fiber (2) through incidence end single-mode fiber (1) connects finally by output terminal core shift exports.
2. Fibre Optical Sensor according to claim 1, it is characterized in that: described incidence end single-mode fiber (1) is 125 μm with the cladding diameter of exit end single-mode fiber (3), the diameter of fibre core is 8.3 μm, the cladding diameter of photonic crystal fiber (2) is 125 μm, core diameter is 7 μm, and length range is 4 ~ 6cm; Photonic crystal fiber (2) two ends and single-mode fiber (1), (3) radial direction carry out the dislocation welding of small distance, and radial misalignments distance is less than or equal to 9 μm.
3. Fibre Optical Sensor according to claim 2, is characterized in that: the preferred length of described photonic crystal fiber (2) is 5cm, and the distance of radial misalignments welding is about 7 μm.
4. Fibre Optical Sensor according to claim 1 and 2, it is characterized in that: according to interference theory, fibre core pattern and cladding mode are interfered, there is interference peaks, utilize photonic crystal fiber less sensitive to temperature, and the interference peaks refractive index that this invention produces is more responsive, the refractive index sensitivity measure of degree of precision can be realized.
5. Fibre Optical Sensor according to claim 1 and 2, it is characterized in that: there is certain phase differential according between cladding mode and fibre core pattern, when the phase differential of fibre core pattern and cladding mode meets φ=2 π Δ nL/ λ, interfere at second core shift weld, according to the drift value of interfering crest, temperature and refractive index sensitivity can be calculated, in its Chinese style, Δ n is the refringence of fibre core and covering, λ is the wavelength in vacuum, and L is the length of interfering arm photonic crystal fiber (2).
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Cited By (13)
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| CN104897618A (en) * | 2015-06-09 | 2015-09-09 | 哈尔滨工程大学 | Two-channel distribution sensing detection device |
| CN106054316A (en) * | 2016-08-12 | 2016-10-26 | 重庆大学 | Integrated all-fiber interference-type light modulator based on graphene and manufacturing method thereof |
| CN106405447A (en) * | 2016-08-26 | 2017-02-15 | 北京信息科技大学 | Method utilizing fiber core mismatch interference structure to measure magnetic field |
| CN106403833A (en) * | 2016-08-26 | 2017-02-15 | 北京信息科技大学 | Method utilizing fiber core mismatch interference structure to measure strain |
| CN106404718A (en) * | 2016-08-26 | 2017-02-15 | 北京信息科技大学 | Method of measuring refractive index with fiber core mismatch interference structure |
| CN106546187A (en) * | 2016-10-19 | 2017-03-29 | 暨南大学 | A kind of LPFG curvature sensor and its detection method |
| CN106989795A (en) * | 2017-03-10 | 2017-07-28 | 上海电机学院 | A kind of Hollow-Core Photonic Crystal Fibers liquid level sensor and its making, application method |
| CN109855555A (en) * | 2019-01-09 | 2019-06-07 | 西南交通大学 | A kind of optical fibre bending sensor of achievable axial strain compensation |
| CN110389111A (en) * | 2019-07-10 | 2019-10-29 | 哈尔滨工程大学 | One kind being based on bimodulus core shift optical fiber interference type index sensor |
| CN111289021A (en) * | 2020-03-16 | 2020-06-16 | 中天科技光纤有限公司 | Optical fiber sensing device and detection system |
| CN111412938A (en) * | 2020-04-29 | 2020-07-14 | 南京信息工程大学 | Three-parameter measurement mixed structure interferometer sensor |
| CN113533255A (en) * | 2021-07-27 | 2021-10-22 | 广东海洋大学 | Refractive index sensor and system |
| CN113758507A (en) * | 2020-10-21 | 2021-12-07 | 北京交通大学 | Temperature and stress sensor based on few-mode optical fiber and photonic crystal optical fiber |
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| CN104897618A (en) * | 2015-06-09 | 2015-09-09 | 哈尔滨工程大学 | Two-channel distribution sensing detection device |
| CN104897618B (en) * | 2015-06-09 | 2017-11-17 | 哈尔滨工程大学 | A kind of binary channels distributed sensing detection means |
| CN106054316A (en) * | 2016-08-12 | 2016-10-26 | 重庆大学 | Integrated all-fiber interference-type light modulator based on graphene and manufacturing method thereof |
| CN106405447A (en) * | 2016-08-26 | 2017-02-15 | 北京信息科技大学 | Method utilizing fiber core mismatch interference structure to measure magnetic field |
| CN106403833A (en) * | 2016-08-26 | 2017-02-15 | 北京信息科技大学 | Method utilizing fiber core mismatch interference structure to measure strain |
| CN106404718A (en) * | 2016-08-26 | 2017-02-15 | 北京信息科技大学 | Method of measuring refractive index with fiber core mismatch interference structure |
| CN106546187A (en) * | 2016-10-19 | 2017-03-29 | 暨南大学 | A kind of LPFG curvature sensor and its detection method |
| CN106989795A (en) * | 2017-03-10 | 2017-07-28 | 上海电机学院 | A kind of Hollow-Core Photonic Crystal Fibers liquid level sensor and its making, application method |
| CN109855555A (en) * | 2019-01-09 | 2019-06-07 | 西南交通大学 | A kind of optical fibre bending sensor of achievable axial strain compensation |
| CN110389111A (en) * | 2019-07-10 | 2019-10-29 | 哈尔滨工程大学 | One kind being based on bimodulus core shift optical fiber interference type index sensor |
| CN111289021A (en) * | 2020-03-16 | 2020-06-16 | 中天科技光纤有限公司 | Optical fiber sensing device and detection system |
| CN111412938A (en) * | 2020-04-29 | 2020-07-14 | 南京信息工程大学 | Three-parameter measurement mixed structure interferometer sensor |
| CN111412938B (en) * | 2020-04-29 | 2022-03-11 | 南京信息工程大学 | Three-parameter measurement mixed structure interferometer sensor |
| CN113758507A (en) * | 2020-10-21 | 2021-12-07 | 北京交通大学 | Temperature and stress sensor based on few-mode optical fiber and photonic crystal optical fiber |
| CN113533255A (en) * | 2021-07-27 | 2021-10-22 | 广东海洋大学 | Refractive index sensor and system |
| CN113533255B (en) * | 2021-07-27 | 2022-06-14 | 广东海洋大学 | Refractive index sensor and system |
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