CN105928469B - It is a kind of it is highly sensitive differentiate bending direction without the sensitive Curvature Optical Fiber Sensor of Temperature cross-over - Google Patents
It is a kind of it is highly sensitive differentiate bending direction without the sensitive Curvature Optical Fiber Sensor of Temperature cross-over Download PDFInfo
- Publication number
- CN105928469B CN105928469B CN201610405820.8A CN201610405820A CN105928469B CN 105928469 B CN105928469 B CN 105928469B CN 201610405820 A CN201610405820 A CN 201610405820A CN 105928469 B CN105928469 B CN 105928469B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- core
- thin
- fiber
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 136
- 238000005452 bending Methods 0.000 title claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 144
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 40
- 230000004927 fusion Effects 0.000 claims abstract description 17
- 238000005253 cladding Methods 0.000 claims description 27
- 230000035945 sensitivity Effects 0.000 claims description 20
- 238000001228 spectrum Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 7
- 238000000411 transmission spectrum Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 20
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000007526 fusion splicing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- OUSLHGWWWMRAIG-FBCAJUAOSA-N (6r,7r)-7-[[(2z)-2-(furan-2-yl)-2-methoxyiminoacetyl]amino]-3-(hydroxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Chemical compound N([C@@H]1C(N2C(=C(CO)CS[C@@H]21)C(O)=O)=O)C(=O)\C(=N/OC)C1=CC=CO1 OUSLHGWWWMRAIG-FBCAJUAOSA-N 0.000 description 1
- 208000032366 Oversensing Diseases 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
本发明公开了一种高灵敏可判别弯曲方向的无温度交叉灵敏的光纤曲率传感器，包括宽带光源、第一单模光纤、第一熔接点、第一细芯光纤、第一石墨烯薄膜、细芯超长周期光纤光栅、第二石墨烯薄膜、第二细芯光纤、第二熔接点、第二单模光纤和光谱仪；宽带光源与第一单模光纤连接，第一单模光纤与第一细芯光纤的连接点构成第一熔接点；第一和第二石墨烯薄膜分别无间隔的裹覆在细芯超长周期光纤光栅两端的第一和第二细芯光纤上；第二细芯光纤和第二单模光纤的连接点构成第二熔接点；第二单模光纤和光谱仪相连；通过对光谱仪上谐振波长的位置和功率强度进行实时监测，不仅可以实现弯曲方向的判别，还可以避免高灵敏曲率测量过程中由温度引起的交叉干扰。
The invention discloses a high-sensitivity non-temperature cross-sensitive optical fiber curvature sensor capable of judging the bending direction, comprising a broadband light source, a first single-mode optical fiber, a first fusion splicing point, a first thin-core optical fiber, a first graphene film, a thin Core ultra-long period fiber grating, second graphene film, second thin core fiber, second fusion point, second single-mode fiber and spectrometer; broadband light source is connected with first single-mode fiber, and first single-mode fiber is connected with first single-mode fiber The connection point of the thin-core optical fiber constitutes a first fusion point; the first and second graphene films are respectively wrapped on the first and second thin-core optical fibers at both ends of the thin-core ultra-long period fiber grating without space; the second thin-core fiber The connection point between the optical fiber and the second single-mode optical fiber constitutes the second fusion point; the second single-mode optical fiber is connected to the spectrometer; by monitoring the position and power intensity of the resonant wavelength on the spectrometer in real time, not only the bending direction can be judged, but also the bending direction can be determined. Avoid temperature-induced cross-talk during highly sensitive curvature measurements.
Description
Technical field
The invention belongs to the technical fields of optical fiber curvature measurement, specifically, being related to a kind of based on thin optical fiber core ultra-long period
Grating can differentiate bending direction without the sensitive high sensitivity optical fiber curvature sensor of Temperature cross-over.
Background technique
Highly sensitive, Larger Dynamic measurement range optical fiber curvature sensing plays highly important work in monitoring structural health conditions
With, and the variation of ambient temperature is often an important cross jamming factor of high-precision curvature measurement；Therefore, highly sensitive
The curvature sensing of no Temperature cross-over interference is the basic demand that engineer application reaches high standard.Compared with common electric transducer,
The advantages such as fibre optical sensor with no electromagnetic interference, corrosion resistance is strong, easily manufactures, low cost, and response is fast and highly sensitive.
In order to realize the Curvature Optical Fiber Sensor of highly sensitive no Temperature cross-over interference in practical engineering application, study both at home and abroad
Personnel have conducted extensive research highly sensitive optical fiber curvature measurement.In terms of optical fiber curvature measurement, related researcher is proposed
A variety of measurement methods based on single optical fibre device or online interferometer: it is based on optical fiber online Mach Zehnder (Mach-
Zehnder, MZ) the optical fiber curvature sensitivity of interference structure realizes -22.227nm/m-1；Based on long-period fiber grating (Long
Period Grating, LPG), realize -12.55nm/m-1Lower curvature sensitivity measure；In addition, some scholars propose
The optical fiber curvature sensing of temperature-insensitive is realized using double core shift optical fiber (Dual-Concentric-Core Fiber, DCCF)
Device, but its curvature sensitivity is only -9.046nm/m-1.It can be seen that above-mentioned Curvature Optical Fiber Sensor structure mostly use it is single
Wavelength demodulation mode realize the measurement of optical fiber curvature；If ambient temperature changes in the measurement process of curvature,
The spectrum of the structure can generate either large or small drift phenomenon, then necessarily lead to cross-talk, lead to surveyed curvature sensitivity
Inaccurately.In the measurement process of optical fiber curvature, generally require to judge that the direction of fibre-optical bending is come, and above-mentioned single optical fiber device
Circular symmetry is presented in the index distribution of part, does not have apparent directionality.Therefore, existing measurement method can not at present
Meet highly sensitive optical fiber curvature measurement demand, and often there is cross-talks；In addition, cannot differentiate that bending direction is also limit
Make a key factor of its development.
Summary of the invention
For the disadvantages described above and Improvement requirement of the prior art, the present invention provides one kind to be based on thin optical fiber core ultra-long period
Grating can differentiate bending direction without the sensitive high sensitivity optical fiber curvature sensor of Temperature cross-over, its object is to pass through thin core
The different resonance wavelengths that ultra-long-period fiber grating generates measure the variation of curvature and ambient temperature, pass through monitoring resonance respectively
The variation of the changed power of wavelength and wavelength location measures while realizing curvature and temperature and without cross jamming, in addition, can
The direction of fibre-optical bending is judged by the symbol and size of surveyed curvature sensitivity.
To achieve the above object, the present invention provides one kind can differentiate bending direction based on thin core ultra-long-period fiber grating
Without the sensitive high sensitivity optical fiber curvature sensor of Temperature cross-over, including wideband light source, the first single mode optical fiber, the first thin core light
Fibre, the first graphene film, thin core ultra-long-period fiber grating, the second graphene film, the second thin-core fibers, the second single-mode optics
It is fine；The first end of first single mode optical fiber connects the output end of the wideband light source；The second end of first single mode optical fiber connects
The first end of first thin-core fibers, and the connecting pin of first single mode optical fiber and first thin-core fibers is as first
Fusion point；The thin core ultra-long-period fiber grating be connected to first thin-core fibers second end and the second thin core light
Between fine first end；The second end of second thin-core fibers connects the first end of second single mode optical fiber, and described
The connecting pin of two thin-core fibers and second single mode optical fiber is as the second fusion point；First graphene film and described
Two graphene films are symmetrically distributed in the both ends of the thin core ultra-long-period fiber grating；First graphene film and
Second graphene film respectively it is nonseptate wrap on first thin-core fibers and second thin-core fibers be for
The cladding mode inspired due to thin-core fibers and single mode optical fiber mould field mismatch is eliminated, then gained spectrum is the thin core
The pure transmission spectrum of ultra-long-period fiber grating.
Further, fibre optical sensor further includes spectrometer, and the input terminal of spectrometer is connected to the second single mode optical fiber
Second end；The spectrometer is used to show the transmission spectrum of the thin core ultra-long-period fiber grating.
Wherein, nonseptate wrap on the first thin-core fibers of the first graphene film eliminates thin-core fibers and single-mode optics
Fine mould field mismatches the cladding mode generated, and nonseptate wrap on the second thin-core fibers of same second graphene film is eliminated
The cladding mode excited in thin core ultra-long-period fiber grating.
The period of thin core ultra-long-period fiber grating is 1mm~5mm, and the period is than common thin optical fiber light core ultra-long period
The high several times of grid are to more than ten times, and transmission spectrum is more than common thin core ultra-long-period fiber grating to high-order glittering mould and fine because before
The resonance wavelength that core basic mode is coupled to form；The different resonance wavelengths of thin core ultra-long-period fiber grating are due to fine in the grating
The core model covering mode coupling extremely secondary from different diffraction as a result, using unilateral unsymmetric structure thin core ultra-long-period fiber grating
The loss spectra of four resonance wavelength can be shown in the broadband window of 100nm.
For optical fiber curvature measurement when, by generated on spectrometer four resonance wavelength positions be adjusted to window most in
Between；When ambient temperature changes, the variation of temperature can be measured by the change in location of resonance wavelength in spectra re-recorded；
Similarly, when ambient pressure or stress are in the Curvature Optical Fiber Sensor, can by spectrometer resonance wavelength it is strong
Degree changes to measure the sensitivity of fibre-optical bending；When fibre-optical bending direction difference, the symbol of surveyed optical fiber sensitivity can be passed through
Number and size judge the bending direction of optical fiber.
Preferably, the fibre-optical bending measurement further includes the first fixture and the second fixture, first fixture and described
Fixing clamp holds the first single mode optical fiber and the second single mode optical fiber of the Curvature Optical Fiber Sensor, first folder to two fixtures respectively
It is partially in the state freely stretched between tool and second fixture, the position of first fixture is fixed, and described second
Fixture can move.The accuracy that this method can be adjusted curvature is controlled 10-6Magnitude greatly improves the dynamic of curvature measurement
State range and resolution ratio.
Preferably, the first end of the first thin-core fibers and the second end of the first single mode optical fiber are thin to core welding, described second
The second end of core fibre and the first end of second single mode optical fiber are also used to core welding mode；And first thin-core fibers and
The equal length of two thin-core fibers is 2cm~5cm.The cladding diameter of first thin-core fibers and the second thin-core fibers takes
62.5 μm~100 μm, which is less than the cladding diameter of general single mode fiber, is equivalent to partial air and acts as thin core light
Fine covering is sensitiveer to the variation of external environment.
The fibre core diameter of first thin-core fibers and second thin-core fibers is 2 μm~6 μm.
Preferably, the thickness of first graphene film and the second graphene film is identical, takes 10nm~50nm,
The thickness can be eliminated well due to the packet that mould field mismatches the cladding mode of excitation and thin core ultra-long-period fiber grating is coupled out
Layer mould, has filtered the interference spectrum of mode-interference generation, so that it is saturating spectrally to show clean thin core ultra-long-period fiber grating
Penetrate spectrum.
The length of first graphene film and the second graphene film is identical, takes 2cm~4cm.
Preferably, the length of the thin core ultra-long-period fiber grating takes 2~5cm, which can be by thin core ultra-long period
Four resonance wavelengths of fiber grating effectively control within the scope of the low loss window of 1520nm~1620nm, while making this
The measurement structure of optical fiber curvature is compact.
Preferably, the thin core ultra-long-period fiber grating is unilateral unsymmetric structure grating, which can be
While curvature measurement, the bending direction of optical fiber can be accurately judged according to the size and symbol of surveyed curvature.
The higher forward direction high-order glittering cladding mode of cladding mode order can be coupled out using thin core ultra-long-period fiber grating,
The order of cladding mode is higher, then the contrast that forward direction high-order glittering cladding mode couples the resonance peak to be formed with fibre core basic mode is bigger；
And the ordinal number of cladding mode is higher, and corresponding elasto-optical coefficient absolute value is bigger, when curvature changes in same range, thin core overlength
The power level variation of period optical fiber grating resonance peak is bigger, thus compared to common thin core long-period fiber grating, thin core is super
The curvature sensitivity of long-period fiber grating power level demodulation is higher.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
(1) Curvature Optical Fiber Sensor provided by the invention for differentiating bending direction, using thin optical fiber light core ultra-long period
Grid can generate multiple resonance wavelengths, and by using different monitoring modes to resonance wavelength, it can be achieved that interfering without Temperature cross-over
High sensitivity optical fiber curvature measurement corresponded to different sensitive since different resonance wavelengths correspond to different cladding modes
Degree, to can realize more physical parameters while measure.
(2) thin core ultra-long-period fiber grating provided by the invention is unilateral non-to at structure, for the curved of different directions
The changed power of song, resonance wavelength can be different, can differentiate that optical fiber is curved according to the size of the sign of curvature and sensitivity surveyed
Bent direction.
(3) graphene film provided by the invention is nonseptate wraps on thin-core fibers, it can be achieved that Larger Dynamic temperature becomes
Change the optical fiber curvature measurement in range, graphene film can bear more higher than optical fiber warm；Therefore, coupling is needed compared to traditional
Clutch constitute fibre optic interferometer, have structure it is simple, it is cheap, be easily integrated and the big advantage of measurement dynamic range.
Detailed description of the invention
Fig. 1 be the embodiment of the present invention 1 based on thin core ultra-long-period fiber grating can differentiate bending direction without temperature hand over
Pitch sensitive high sensitivity optical fiber curvature sensor structural schematic diagram；
Fig. 2 be in the embodiment of the present invention 1 thin-core fibers with single mode optical fiber welding and graphene film are nonseptate wraps
Schematic diagram on thin-core fibers；
Fig. 3 is thin core ultra-long-period fiber grating and thin the surveyed optical fiber of core long-period fiber grating in the embodiment of the present invention 1
The contrast curve chart of curvature sensitivity.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which: 1- wideband light source,
The first single mode optical fiber of 2-, the first fusion point of 3-, the first thin-core fibers of 4-, the first graphene film of 5-, thin light core ultra-long period of 6-
Fine grating, the second graphene film of 7-, the second thin-core fibers of 8-, the second fusion point of 9-, the second single mode optical fiber of 10-, 11- spectrum
Instrument.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
It is provided by the invention it is a kind of based on thin core ultra-long-period fiber grating can differentiate bending direction without Temperature cross-over spirit
Quick high sensitivity optical fiber curvature sensor, including wideband light source, the first single mode optical fiber, the first fusion point, the first thin-core fibers,
First graphene film, thin core ultra-long-period fiber grating, the second graphene film, the second thin-core fibers, the second fusion point,
Two single mode optical fibers and spectrometer；
Wherein, the both ends of the first single mode optical fiber first end phase with the output end of wideband light source and the first thin-core fibers respectively
Connection；The second end of first single mode optical fiber connects the first end of thin core ultra-long-period fiber grating；First graphene film is continuously
Every wrap on the first thin-core fibers；The second end of thin core ultra-long-period fiber grating connects the first of the second thin-core fibers
End；Second graphene film is nonseptate to be wrapped on the second thin-core fibers；The second end connection second of second thin-core fibers is single
The first end of mode fiber；The second end of second single mode optical fiber is connected with the input terminal of spectrometer.
With reference to embodiments 1 provide differentiate bending direction without the sensitive Curvature Optical Fiber Sensor of Temperature cross-over,
The present invention is further explained；The embodiment of the present invention 1 differentiates sensing without the sensitive optical fiber curvature of Temperature cross-over for bending direction
Device structure is as shown in Figure 1, include wideband light source 1, the first single mode optical fiber 2, the first fusion point 3, the first thin-core fibers 4, the first stone
Black alkene film 5, thin core ultra-long-period fiber grating 6, the second graphene film 7, the second thin-core fibers 8, the second fusion point 9,
Two single mode optical fibers 10 and spectrometer 11；Wideband light source 1 connects the first port of the first single mode optical fiber 2；The of first single mode optical fiber 2
The first port welding of Two-port netwerk and the first thin-core fibers 4 constitutes the first fusion point 3；The second port of first thin-core fibers 4 connects
Connect the first end of thin core ultra-long-period fiber grating 6；First graphene film 5 is nonseptate to be wrapped on the first thin-core fibers 4；
The second end of thin core ultra-long-period fiber grating 6 connects the first end of the second thin-core fibers 8；Second graphene film 7 is without interval
Wrap on the second thin-core fibers 8；The first end welding structure of the second end of second thin-core fibers 8 and the second single mode optical fiber 10
At the second fusion point 9；The second end of second single mode optical fiber 10 is connect with the input terminal of spectrometer 11；
Specifically, in embodiment 1, the first thin-core fibers 4, thin core ultra-long-period fiber grating 6 and the second thin-core fibers 8 exist
On same root thin-core fibers, the core diameter of thin-core fibers is 5.65 μm, and thin-core fibers cladding diameter is 80 μm；First single mode
The second end and the second single mode optical fiber 10 of the first end and the second thin-core fibers 8 of the second end of optical fiber 2 and the first thin-core fibers 4
First end connected by the way of to core welding, the first end of the first single mode optical fiber 2 and wideband light source 1 and the second single-mode optics
It is docked using FC/APC fibre-optical splice by ring flange between the second end and spectrometer of fibre 10.
Below with reference to embodiment 1 to the fibre optical sensor of the above-mentioned curvature for differentiating bending direction and temperature simultaneously measuring
Working principle is illustrated.
The wide spectrum optical that wideband light source 1 issues is transmitted to the first fusion point 3 via the first single mode optical fiber 2；Due to the first single mode
Optical fiber 2 is different from the fibre core diameter of the first thin-core fibers 4, will appear the unmatched phenomenon of mould field at the first fusion point,
The core mode transmitted in the first single mode optical fiber 2 is caused to excite the cladding mode in the first thin-core fibers 4；Due to the first graphene
On the nonseptate surface for wrapping the first thin-core fibers 4 of film 5, and the refractive index of graphene film is compared with the refractive index of fibre cladding
It is big, therefore；The cladding mode being excited in first thin-core fibers 4 causes it to leak into due to the size distribution of interfacial refraction rate
In one graphene film 5, and cladding mode can be worn off in the onwards transmission of graphene film, be caused in thin core overlength week
Mode-interference will not be generated at the grid region of phase fiber grating 6.When core mode continues onwards transmission to thin optical fiber core ultra-long period
When grating 6, since thin core ultra-long-period fiber grating can make segment core mode coupling be known as to covering the cladding mode of fl transmission；
When optical signal is after meticulous core ultra-long-period fiber grating, such as above-mentioned ultra-long-period fiber grating is able to achieve core mode and cladding mode
Between intercouple, leading to the mode transmitted in the second thin-core fibers 8 is still core mode and cladding mode；Similarly, due to second
Graphene film 7 is nonseptate to be wrapped on the second thin-core fibers 8, causes cladding mode also can gradually all in transmission process
It loses；When optical signal reaches the second fusion point 9, the only presence of core mode in the second thin-core fibers 8, not no cladding mode
In the presence of；Core mode in second thin-core fibers 8 is directly transferred in the second single mode optical fiber 10, and last optical signal enters spectrometer
11,4 more apparent loss peaks that thin core ultra-long-period fiber grating 6 generates can be observed on spectrometer 11, wherein most
The contrast at lossy peak is very suitable to the intensity demodulation mode used in optical fiber curvature measurement process up to 25dB.
Thin core ultra-long-period fiber grating when the temperature of external environment changes, in the Curvature Optical Fiber Sensor
The extremely secondary cladding mode of the different rank and diffraction that core mode is coupled out in 6 has different thermo-optical coeffecient and thermal expansion coefficient, from
And the effective refractive index difference between core mode and the cladding mode of fl transmission is caused to change, i.e., it is different on spectrometer 11
Resonance wavelength can generate drift phenomenon simultaneously, and the power level of two resonance wavelengths does not change, by way of Wavelength demodulation,
It can be concluded that different temperatures sensitivity in the Curvature Optical Fiber Sensor；External environment temperature is monitored i.e. by the way of Wavelength demodulation
The variation of degree.
When ambient pressure or stress are in the Curvature Optical Fiber Sensor, the week of thin core ultra-long-period fiber grating 6
The phenomenon that becoming larger or becoming smaller can occur with pressure or stress in phase, and the cladding mode in thin core ultra-long-period fiber grating 6 can be to pressure
The direction of power or stress is let out, and the strength reduction of Mode Coupling in optical fiber is caused, and can be observed on spectrometer 11
Only have the variation of intensity to resonance wavelength, and the phenomenon that the drift of non-generation wavelength；To obtain light by way of intensity demodulation
The size of fine curvature sensitivity.When thin 6 pressure direction difference of core ultra-long-period fiber grating, thin core overlength week can be passed through
The symbol of the variation for the different resonance wavelength intensity that phase fiber grating generates differentiates that optical fiber is curved with the sensitive size of gained is calculated
Bent direction.
It is sensitive that by thin core ultra-long-period fiber grating with thin core long-period fiber grating optical fiber curvature is surveyed shown in attached drawing 3
The correlation curve of degree, it is seen that thin core ultra-long-period fiber grating and thin core long-period fiber grating are in same curvature
In variation range, near 99%, the slope of corresponding different curve linear fittings is respectively the linearity of matched curve
97.77dB/m-1And 15.50dB/m-1, i.e., optical fiber of the described thin core ultra-long-period fiber grating than thin core long-period fiber grating
Curvature high sensitivity is a kind of highly sensitive Curvature Optical Fiber Sensor demodulated by power level more than 6 times.
Based on the measurement method of above-mentioned optical fiber curvature, highly sensitive optical fiber bending can be obtained only with the method for intensity demodulation
Rate sensor；Even if the ambient temperature moment generates variation, the intensity of the Curvature Optical Fiber Sensor resonance wavelength is not influenced,
Only it can cause the drift of wavelength, to avoid the cross jamming generated in optical fiber curvature measurement process by temperature well；Cause
This, the Curvature Optical Fiber Sensor is a kind of highly sensitive measuring device for differentiating bending direction and interfering without Temperature cross-over.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610405820.8A CN105928469B (en) | 2016-06-07 | 2016-06-07 | It is a kind of it is highly sensitive differentiate bending direction without the sensitive Curvature Optical Fiber Sensor of Temperature cross-over |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610405820.8A CN105928469B (en) | 2016-06-07 | 2016-06-07 | It is a kind of it is highly sensitive differentiate bending direction without the sensitive Curvature Optical Fiber Sensor of Temperature cross-over |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105928469A CN105928469A (en) | 2016-09-07 |
| CN105928469B true CN105928469B (en) | 2019-01-04 |
Family
ID=56833769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610405820.8A Active CN105928469B (en) | 2016-06-07 | 2016-06-07 | It is a kind of it is highly sensitive differentiate bending direction without the sensitive Curvature Optical Fiber Sensor of Temperature cross-over |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105928469B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546187A (en) * | 2016-10-19 | 2017-03-29 | 暨南大学 | A kind of LPFG curvature sensor and its detection method |
| CN106767488A (en) * | 2016-11-02 | 2017-05-31 | 北京信息科技大学 | Temperature and strain testing method based on LPFG and thin-core fibers |
| CN107063317B (en) * | 2017-04-27 | 2019-12-31 | 西南交通大学 | A Demodulation Method of Multi-core Fiber Bragg Grating Curvature Sensor |
| CN108180866B (en) * | 2017-12-31 | 2021-01-01 | 西北大学 | Fiber grating vector bending recognizer |
| CN108168729B (en) * | 2018-01-30 | 2024-02-13 | 中国海洋大学 | Two-point seawater temperature sensor based on cascade connection of fine core optical fiber and standard single mode optical fiber |
| CN108254317A (en) * | 2018-01-30 | 2018-07-06 | 濮阳光电产业技术研究院 | A kind of fiber bragg grating temperature sensor in non-grid region coating polyimide |
| CN108801308A (en) * | 2018-08-29 | 2018-11-13 | 闫静 | A kind of fiber grating Multifunction Sensor |
| CN111811438A (en) * | 2020-07-14 | 2020-10-23 | 山东科技大学 | A system and method for level control of fully mechanized mining face |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1683903A (en) * | 2005-03-17 | 2005-10-19 | 上海交通大学 | Simultaneous measurement method of bending curvature and bending direction |
| CN101539644A (en) * | 2009-04-29 | 2009-09-23 | 清华大学 | Method for manufacturing fiber grating and sensor using same |
| JP2013178210A (en) * | 2012-02-29 | 2013-09-09 | Olympus Corp | Fiber curvature sensor |
| CN103712575A (en) * | 2014-01-08 | 2014-04-09 | 天津大学 | Optic bending curvature testing method and sensor |
| CN203672333U (en) * | 2013-12-31 | 2014-06-25 | 中国计量学院 | Curvature sensor based on waist-enlarged welding fiber grating |
| CN203785642U (en) * | 2014-04-16 | 2014-08-20 | 中国计量学院 | An all-fiber bending sensor based on a peanut-shaped structure |
| CN105277135A (en) * | 2015-09-22 | 2016-01-27 | 东北大学 | High sensitivity optical fiber curvature sensing construction having temperature insensitive characteristic |
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
-
2016
- 2016-06-07 CN CN201610405820.8A patent/CN105928469B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1683903A (en) * | 2005-03-17 | 2005-10-19 | 上海交通大学 | Simultaneous measurement method of bending curvature and bending direction |
| CN101539644A (en) * | 2009-04-29 | 2009-09-23 | 清华大学 | Method for manufacturing fiber grating and sensor using same |
| JP2013178210A (en) * | 2012-02-29 | 2013-09-09 | Olympus Corp | Fiber curvature sensor |
| CN203672333U (en) * | 2013-12-31 | 2014-06-25 | 中国计量学院 | Curvature sensor based on waist-enlarged welding fiber grating |
| CN103712575A (en) * | 2014-01-08 | 2014-04-09 | 天津大学 | Optic bending curvature testing method and sensor |
| CN203785642U (en) * | 2014-04-16 | 2014-08-20 | 中国计量学院 | An all-fiber bending sensor based on a peanut-shaped structure |
| CN105277135A (en) * | 2015-09-22 | 2016-01-27 | 东北大学 | High sensitivity optical fiber curvature sensing construction having temperature insensitive characteristic |
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
Non-Patent Citations (1)
| Title |
|---|
| CO2激光制备新型长周期光纤光栅及传感特性研究;钟晓勇;《中国优秀硕士学位论文全文数据库 信息科技辑》;20151215(第12期);正文第46-57页第4章 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105928469A (en) | 2016-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105928469B (en) | It is a kind of it is highly sensitive differentiate bending direction without the sensitive Curvature Optical Fiber Sensor of Temperature cross-over | |
| CN108332876B (en) | Optical fiber temperature sensor | |
| Liu et al. | Hollow-core fiber-based all-fiber FPI sensor for simultaneous measurement of air pressure and temperature | |
| CN105698858B (en) | A kind of fibre optical sensor for the curvature and temperature simultaneously measuring for differentiating bending direction | |
| Lin et al. | High-sensitivity salinity measurement sensor based on no-core fiber | |
| CN108844656B (en) | Optical fiber temperature sensing probe and demodulation method | |
| Tian et al. | Directional bending sensor based on a dual side-hole fiber Mach–Zehnder interferometer | |
| CN203287311U (en) | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor | |
| CN106802190B (en) | A highly sensitive optical fiber torsion sensor without temperature cross-interference | |
| CN205655942U (en) | Meet an emergency and optical fiber sensor of temperature simultaneous measurement | |
| CN102261965B (en) | Temperature sensing method and device based on dual-core optical fiber | |
| CN204718708U (en) | A kind of sensor simultaneously measured with strain based on temperature that is spherical and thin-core fibers | |
| CN110987230B (en) | A dual-parameter optical fiber sensing module and system | |
| CN205642682U (en) | Optic fibre moment of torsion sensing system based on polarization maintaining fiber sagnac ring | |
| Tong et al. | Research on simultaneous measurement of refractive index and temperature comprising few mode fiber and spherical structure | |
| CN108195485A (en) | Temperature and the biparameter sensor of strain and preparation method thereof are measured based on LPFG and MZ cascades | |
| CN204807233U (en) | Temperature sensor of photonic crystal optic fibre michelson interferometer based on corrosion treatment | |
| CN205719020U (en) | The polarization maintaining optical fibre sensor that a kind of temperature is measured with strain simultaneously | |
| CN107748018A (en) | Fiber Bragg Grating temperature bend sensor based on Mach Zehnder interferometry | |
| CN204630604U (en) | A kind of SMS type parallel multiplex multiplex optical fibre sensor | |
| CN203893826U (en) | Intensity-modulation fiber Michelson strain sensor and sensor device | |
| CN206573150U (en) | A kind of temperature based on Mach-Zehnder interferometer and the fibre optical sensor of refractive index synchro measure | |
| CN103134776B (en) | Liquid refractive index absolute measurement sensor based on D-type polarization maintaining optical fibre | |
| CN102261978A (en) | Method and device for implementing hydraulic pressure sensing based on twin-core and twin-hole optical fiber | |
| CN112611479A (en) | PDMS (polydimethylsiloxane) -modified double-calibration micro-nano fiber grating temperature sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |