CN105928469A - High-sensitivity fiber curvature sensor capable of discriminating bending direction and free of cross temperature sensitivity - Google Patents
High-sensitivity fiber curvature sensor capable of discriminating bending direction and free of cross temperature sensitivity Download PDFInfo
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- CN105928469A CN105928469A CN201610405820.8A CN201610405820A CN105928469A CN 105928469 A CN105928469 A CN 105928469A CN 201610405820 A CN201610405820 A CN 201610405820A CN 105928469 A CN105928469 A CN 105928469A
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- 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
Abstract
The invention discloses high-sensitivity fiber curvature sensor capable of discriminating the bending direction and free of cross temperature sensitivity. The sensor comprises a broadband light source, a first single mode fiber, a first welding point, a first thin core fiber, a first graphene film, a thin-core super long period fiber grating, a second graphene film, a second thin core fiber, a second welding point, a second single mode fiber and a sepctrometer, wherein the broadband light source is connected with the first single mode fiber, the connecting points between the first single mode fiber and the first thin core fiber form the first welding point, the first and second graphene films wrap the first and second thin core fibers at the two ends of the thin-core super long period fiber grating without interval respectively, the connecting point between the second thin core fiber and the second single mode fiber for the second welding point, and the second single mode fiber is connected with the spectrometer. The resonant wavelength position and power intensity of the spectrometer are monitored in real time, so that the bending direction can be discriminated, and cross interference caused by temperature can be avoided in the high-sensitivity curvature measuring process.
Description
Technical field
The invention belongs to the technical field that optical fiber curvature is measured, concrete, relate to a kind of super based on thin core
LPFG can differentiate that the high sensitivity optical fiber curvature sensitive without Temperature cross-over of bending direction passes
Sensor.
Background technology
Highly sensitive, Larger Dynamic is measured the optical fiber curvature sensing of scope and is played very in monitoring structural health conditions
Important effect, and an important friendship of the change of ambient temperature high accuracy curvature measurement often
Fork interference factor；Therefore, the highly sensitive curvature sensing without Temperature cross-over interference is that engineer applied reaches high
The basic demand of standard.Compared with common electric transducer, Fibre Optical Sensor has without electromagnetic interference,
The advantages such as corrosion resistance is strong, easily manufactures, low cost, and response is fast and highly sensitive.
In order to realize the highly sensitive Curvature Optical Fiber Sensor without Temperature cross-over interference in practical engineering application,
Research worker has carried out numerous studies to high-sensitive optical fiber curvature measurement both at home and abroad.Survey at optical fiber curvature
Amount aspect, related researcher proposes multiple based on single optical fibre device or the measurement of online interferometer
Method: optical fiber curvature based on optical fiber online Mach Zehnder (Mach-Zehnder, MZ) interference structure
Sensitivity achieves-22.227nm/m-1；Based on LPFG (Long Period Grating,
LPG), it is achieved that-12.55nm/m-1Relatively low curvature sensitivity measure；Additionally, also there is scholar to propose
Double core shift optical fiber (Dual-Concentric-Core Fiber, DCCF) is used to achieve temperature-insensitive
Curvature Optical Fiber Sensor, but its curvature sensitivity be only-9.046nm/m-1.It will be seen that it is above-mentioned
Curvature Optical Fiber Sensor structure mostly uses single Wavelength demodulation mode to realize the survey of optical fiber curvature
Amount；If during the measurement of curvature, ambient temperature changes, the spectrum meeting of described structure
Produce either large or small drift phenomenon, then necessarily lead to cross-talk, cause surveyed curvature sensitivity not
Accurately.During the measurement of optical fiber curvature, generally require and judge that the direction of fibre-optical bending is come, and on
The index distribution stating single optical fibre device all presents circular symmetry, does not have obvious directivity.
Therefore, current existing measuring method can not meet high-sensitive optical fiber curvature measurement demand, and past
Toward there is cross-talk；It addition, can not differentiate bending direction be also limit its development one important
Factor.
Summary of the invention
For disadvantages described above and the Improvement requirement of prior art, the invention provides a kind of super based on thin core
LPFG can differentiate that the high sensitivity optical fiber curvature sensitive without Temperature cross-over of bending direction passes
Sensor, its object is to the different resonance wavelengths by thin core ultra-long-period fiber grating produces and measures
Curvature and the change of ambient temperature, respectively by the monitoring changed power of resonance wavelength and wavelength location
Measure, additionally, surveyed curvature can be passed through while change realizes curvature and temperature and without cross interference
The symbol of sensitivity and size judge the direction of fibre-optical bending.
For achieving the above object, the invention provides one can sentence based on thin core ultra-long-period fiber grating
The high sensitivity optical fiber curvature sensor sensitive without Temperature cross-over of other bending direction, including wideband light source,
First single-mode fiber, the first thin-core fibers, the first graphene film, thin core ultra-long-period fiber grating,
Second graphene film, the second thin-core fibers, the second single-mode fiber；First end of the first single-mode fiber
Connect the outfan of described wideband light source；Second end of described first single-mode fiber connects described first thin
First end of core fibre, and the connection end conduct of described first single-mode fiber and described first thin-core fibers
First fusion point；Described thin core ultra-long-period fiber grating is connected to the second of described first thin-core fibers
Between end and the first end of described second thin-core fibers；Second end of described second thin-core fibers connects institute
State the first end of the second single-mode fiber, and the company of described second thin-core fibers and described second single-mode fiber
Connect end as the second fusion point；Described first graphene film and described second graphene film are symmetrical
It is distributed in the two ends of described thin core LPFG；Described first graphene film and described second
Graphene film is the most nonseptate to be wrapped on described first thin-core fibers and described second thin-core fibers
It it is to eliminate the cladding mode not mating because of thin-core fibers and single-mode fiber mode field and inspiring, then institute
Obtain spectrum and be the pure transmission spectrum of described thin core ultra-long-period fiber grating.
Further, Fibre Optical Sensor also includes spectrogrph, and the input of spectrogrph is connected to second
Second end of single-mode fiber；Described spectrogrph is for showing the saturating of described thin core ultra-long-period fiber grating
Penetrate spectrum.
Wherein, nonseptate the wrapping of the first graphene film eliminates thin core light on the first thin-core fibers
The fine cladding mode not mating generation with single-mode fiber mode field, same second graphene film is nonseptate to be wrapped up in
Overlay on and on the second thin-core fibers, eliminate the cladding mode excited in thin core ultra-long-period fiber grating.
The cycle of thin core ultra-long-period fiber grating is 1mm～5mm, and the common thin core of its period ratio surpasses
LPFG high several times are to tens times, and its transmission spectrum is than common thin core optical fiber ultra-long period light
Grid are many because forward direction high-order glitters the resonance wavelength that mould is coupled to form with fibre core basic mode；Carefully core ultra-long period
The different resonance wavelengths of fiber grating are due to the most secondary covering of core mode and different diffraction in described grating
The result of mode coupling, the thin core ultra-long-period fiber grating using unilateral unsymmetric structure can be
The loss spectra of four resonance wavelengths is demonstrated in the broadband window of 100nm.
When optical fiber curvature is measured, by four resonance wavelength position adjustments of generation on spectrogrph to window
Mouthful middle；When ambient temperature changes, can be by the position of resonance wavelength in spectra re-recorded
Put change and measure the change of temperature；In like manner, described optical fiber curvature is acted on when ambient pressure or stress
During sensor, the sensitive of fibre-optical bending can be measured by the Strength Changes of resonance wavelength on spectrogrph
Degree；When fibre-optical bending direction difference, can be sentenced by the symbol of institute's light-metering fibre sensitivity and size
The bending direction of disconnected optical fiber.
Preferably, described fibre-optical bending is measured and is also included the first fixture and the second fixture, described first folder
Tool and described second fixture fixation clamp respectively hold described Curvature Optical Fiber Sensor the first single-mode fiber and
Second single-mode fiber, being partially between described first fixture and described second fixture is freely stretched
State, the position of described first fixture fixes, and described second fixture can move.The method can be by song
The degree of accuracy of rate regulation controls 10-6Magnitude, greatly improves the dynamic range of curvature measurement and divides
Resolution.
Preferably, the first end of the first thin-core fibers and the two port core welding of the first single-mode fiber,
Second end of described second thin-core fibers is also adopted by core welding with the first end of described second single-mode fiber
Mode；And first the length of thin-core fibers and the second thin-core fibers equal, for 2cm～5cm.Described
The cladding diameter of one thin-core fibers and the second thin-core fibers takes 62.5 μm～100 μm, and this diameter range is little
In the cladding diameter of general single mode fiber, be equivalent to partial air and act as the covering of thin-core fibers, right
The change of external environment is sensitiveer.
The fibre core diameter of described first thin-core fibers and described second thin-core fibers is 2 μm～6 μm.
Preferably, the thickness of described first graphene film and the second graphene film is identical, all takes
10nm～50nm, this thickness can well eliminate and not mate the cladding mode excited and thin core due to mould field and surpass
The cladding mode that LPFG is coupled out, has filtered the interference spectrum that mode-interference produces so that light
Clean thin core ultra-long-period fiber grating transmission spectrum is presented in spectrum.
The length of described first graphene film and the second graphene film is identical, all takes 2cm～4cm.
Preferably, the length of described thin core ultra-long-period fiber grating takes 2～5cm, and this length can be by thin
Four resonance wavelengths of core ultra-long-period fiber grating effectively control the low damage at 1520nm～1620nm
In consumption window ranges, the measurement structure simultaneously making this optical fiber curvature is compact.
Preferably, described thin core ultra-long-period fiber grating is unilateral unsymmetric structure grating, and this is non-right
Claim structure can judge accurately according to the size of surveyed curvature and symbol while curvature measurement
Go out the bending direction of optical fiber.
Use thin core ultra-long-period fiber grating can be coupled out cladding mode exponent number higher forward direction high-order to glitter
Cladding mode, the exponent number of its cladding mode is the highest, then the forward direction high-order cladding mode that glitters couples shape with fibre core basic mode
The contrast of the resonance peak become is the biggest；And the ordinal number of cladding mode is the highest, corresponding elasto-optical coefficient absolute value
The biggest, when curvature changes in same range, the power of thin core ultra-long-period fiber grating resonance peak
Strength Changes is bigger, thus compares common thin core LPFG, thin core optical fiber ultra-long period
The curvature sensitivity of grating power level demodulation is higher.
In general, by the contemplated above technical scheme of the present invention compared with prior art, have
Following beneficial effect:
(1) Curvature Optical Fiber Sensor of the differentiated bending direction that the present invention provides, uses thin core overlength
Period optical fiber grating can produce multiple resonance wavelength, and by resonance wavelength is used different monitoring sides
Formula, can realize the high sensitivity optical fiber curvature measurement without Temperature cross-over interference, due to different resonance wavelengths
Corresponding different cladding mode, i.e. correspond to different sensitivity, thus it is same to realize many physical parameters
Time measure.
(2) the thin core ultra-long-period fiber grating that the present invention provides is unilateral non-to becoming structure, for not
Equidirectional bending, the changed power of resonance wavelength can difference, can according to the sign of curvature surveyed and
The size of sensitivity differentiates the direction of fibre-optical bending.
(3) graphene film of present invention offer is nonseptate wraps on thin-core fibers, can realize big
Optical fiber curvature in dynamic temperature excursion is measured, and graphene film can bear more higher temperature than optical fiber
Warm；Therefore, compare traditional fibre optic interferometer needing bonder to constitute, there is simple in construction, valency
Lattice are cheap, be easily integrated advantage big with measurement dynamic range.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present invention 1 can differentiate bending direction based on thin core ultra-long-period fiber grating
The high sensitivity optical fiber curvature sensor structural representation sensitive without Temperature cross-over；
Fig. 2 be in the embodiment of the present invention 1 thin-core fibers and single-mode fiber welding and graphene film without
The schematic diagram wrapped on thin-core fibers at interval；
Fig. 3 is thin core ultra-long-period fiber grating and thin core long period optical fiber light in the embodiment of the present invention 1
The correlation curve figure of grid surveyed optical fiber curvature sensitivity.
In all of the figs, identical reference is used for representing identical element or structure, wherein:
1-wideband light source, 2-the first single-mode fiber, 3-the first fusion point, 4-the first thin-core fibers, 5-the first stone
Ink alkene thin film, 6-thin core ultra-long-period fiber grating, 7-the second graphene film, 8-the second thin-core fibers,
9-the second fusion point, 10-the second single-mode fiber, 11-spectrogrph.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And embodiment, the present invention is further elaborated.Should be appreciated that described herein specifically
Embodiment only in order to explain the present invention, is not intended to limit the present invention.Additionally, it is disclosed below
Just may be used as long as technical characteristic involved in each embodiment of the present invention does not constitutes conflict each other
To be mutually combined.
A kind of nothing temperature that can differentiate bending direction based on thin core ultra-long-period fiber grating that the present invention provides
Degree intersects sensitive high sensitivity optical fiber curvature sensor, including wideband light source, the first single-mode fiber,
First fusion point, the first thin-core fibers, the first graphene film, thin core ultra-long-period fiber grating,
Second graphene film, the second thin-core fibers, the second fusion point, the second single-mode fiber and spectrogrph；
Wherein, the two ends of the first single-mode fiber respectively with outfan and first thin-core fibers of wideband light source
The first end be connected；Second end of the first single-mode fiber connects the of thin core ultra-long-period fiber grating
One end；First graphene film is nonseptate to be wrapped on the first thin-core fibers；Thin core light ultra-long period
Second end of fine grating connects the first end of the second thin-core fibers；Second graphene film is nonseptate to be wrapped up in
Overlay on the second thin-core fibers；Second end of the second thin-core fibers connects the first end of the second single-mode fiber；
Second end of the second single-mode fiber is connected with the input of spectrogrph.
The optical fiber bending sensitive without Temperature cross-over below in conjunction with the differentiated bending direction that embodiment 1 provides
Rate sensor, is expanded on further the present invention；The nothing temperature of the differentiated bending direction of the embodiment of the present invention 1
Degree intersects sensitive Curvature Optical Fiber Sensor structure as it is shown in figure 1, include wideband light source the 1, first single mode
Optical fiber the 2, first fusion point the 3, first thin-core fibers the 4, first graphene film 5, thin core overlength week
Phase fiber grating the 6, second graphene film the 7, second thin-core fibers the 8, second fusion point 9, second
Single-mode fiber 10 and spectrogrph 11；Wideband light source 1 connects the first port of the first single-mode fiber 2；The
Second port of one single-mode fiber 2 and the first port welding of the first thin-core fibers 4 constitute the first welding
Point 3；Second port of the first thin-core fibers 4 connects 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；Thin core optical fiber ultra-long period
Second end of grating 6 connects the first end of the second thin-core fibers 8；Second graphene film 7 continuously every
Wrap on the second thin-core fibers 8；Second end of the second thin-core fibers 8 and the second single-mode fiber 10
The first end welding constitute the second fusion point 9；Second end of the second single-mode fiber 10 and spectrogrph 11
Input connects；
Specifically, in embodiment 1, the first thin-core fibers 4, thin core ultra-long-period fiber grating 6 and
Two thin-core fibers 8 are on same thin-core fibers, and the core diameter of its thin-core fibers is 5.65 μm, carefully
Core fibre cladding diameter is 80 μm；Second end of the first single-mode fiber 2 and the of the first thin-core fibers 4
First end of one end and the second end of the second thin-core fibers 8 and the second single-mode fiber 10 uses and melts core
The mode connect connects, the first end of the first single-mode fiber 2 and wideband light source 1 and the second single-mode fiber
FC/APC fibre-optical splice is utilized to be docked by ring flange between second end and the spectrogrph of 10.
Below in conjunction with embodiment 1 to the above-mentioned curvature differentiating bending direction and the light of temperature simultaneously measuring
The operation principle of fiber sensor is illustrated.
The wide spectrum optical that wideband light source 1 sends transmits to the first fusion point 3 via the first single-mode fiber 2；By
Different from the fibre core diameter of the first thin-core fibers 4, at the first fusion point in the first single-mode fiber 2
Place there will be the unmatched phenomenon in mould field, causes the core mode of transmission in the first single-mode fiber 2 to excite
Cladding mode in first thin-core fibers 4；First is wrapped owing to the first graphene film 5 is nonseptate
On the surface of thin-core fibers 4, and the refractive index of graphene film wants big compared with the refractive index of fibre cladding,
Therefore；The cladding mode being excited in first thin-core fibers 4 causes due to the size distribution of interfacial refraction rate
It leaks in the first graphene film 5, and cladding mode can be by the onwards transmission of graphene film
Gradually lose, cause to produce mode-interference at the grid region of thin core ultra-long-period fiber grating 6.
When core mode continues onwards transmission to thin core ultra-long-period fiber grating 6, due to thin core ultra-long period
Fiber grating can make segment core mode coupling be referred to as the cladding mode of fl transmission to covering；When optical signal warp
After meticulous core ultra-long-period fiber grating, as above-mentioned ultra-long-period fiber grating can realize core mode and bag
Intercoupling of layer intermode, causing the pattern of transmission in the second thin-core fibers 8 is still core mode and bag
Layer mould；In like manner, wrap owing to the second graphene film 7 is nonseptate on the second thin-core fibers 8,
Cladding mode is caused also can the most all to lose in transmitting procedure；When optical signal arrives the second welding
During point 9, the second thin-core fibers 8 only has the existence of core mode, there is no cladding mode；Second
Core mode in thin-core fibers 8 is directly transferred in the second single-mode fiber 10, and last optical signal enters light
Spectrometer 11, can be observed 4 of the generation of thin core ultra-long-period fiber grating 6 more on spectrogrph 11
Significantly loss peak, wherein the contrast at maximum loss peak is up to 25dB, is especially suitable for optical fiber curvature and surveys
The intensity demodulation mode used during amount.
Thin core overlength week when the temperature of external environment changes, in described Curvature Optical Fiber Sensor
Different rank that in phase fiber grating 6, core mode is coupled out and the most secondary cladding mode of diffraction have different
Thermo-optical coeffecient and thermal coefficient of expansion, thus cause between core mode and the cladding mode of fl transmission effective
Refractivity changes, and i.e. different on spectrogrph 11 resonance wavelength can produce drift phenomenon simultaneously,
The power level of two resonance wavelengths does not changes, by the way of Wavelength demodulation, it can be deduced that this light
Different temperatures sensitivity in fine curvature sensor；I.e. use the mode of Wavelength demodulation to monitor external environment
The change of temperature.
When ambient pressure or stress act on described Curvature Optical Fiber Sensor, thin core optical fiber ultra-long period
The cycle of grating 6 can occur becoming phenomenon that is big or that diminish, thin core light ultra-long period along with pressure or stress
Cladding mode in fine grating 6 can let out to the direction of pressure or stress effect, causes optical fiber middle mold
The intensity of formula coupling reduces, and can observe that resonance wavelength only has the change of intensity on spectrogrph 11,
And do not produce the phenomenon of wave length shift；Thus by the way of intensity demodulation, draw optical fiber curvature sensitivity
Size.When thin core ultra-long-period fiber grating 6 pressure direction difference, can be surpassed by thin core
Symbol and the calculating gained of the change of the different resonance wavelength intensity that LPFG produces are sensitive
Size differentiates the direction of fibre-optical bending.
For thin core ultra-long-period fiber grating and the light-metering of thin core LPFG institute shown in accompanying drawing 3
The correlation curve of fine curvature sensitivity, it is seen that thin core ultra-long-period fiber grating and thin core
LPFG is in same curvature excursion, and the linearity of its matched curve is all attached 99%
Closely, the slope of corresponding different curve linear matching is respectively 97.77dB/m-1And 15.50dB/m-1, i.e.
Described thin core ultra-long-period fiber grating is more highly sensitive than the optical fiber curvature of thin core LPFG
More than 6 times, it it is a kind of highly sensitive Curvature Optical Fiber Sensor demodulated by power level.
Metering system based on above-mentioned optical fiber curvature, the method only with intensity demodulation can obtain Gao Ling
Quick Curvature Optical Fiber Sensor；Even if the ambient temperature moment produces change, described optical fiber curvature is sensed
The intensity of device resonance wavelength does not affect, and only can cause the drift of wavelength, thus well avoid light
The cross interference produced by temperature during fine curvature measurement；Therefore, described Curvature Optical Fiber Sensor is
A kind of highly sensitive measurement apparatus differentiating that bending direction disturbs without Temperature cross-over.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention,
Not in order to limit the present invention, all made within the spirit and principles in the present invention any amendment, etc.
With replacement and improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the highly sensitive Curvature Optical Fiber Sensor sensitive without Temperature cross-over differentiating bending direction, it is characterized in that, including wideband light source (1), the first single-mode fiber (2), the first thin-core fibers (4), the first graphene film (5), thin core ultra-long-period fiber grating (6), the second graphene film (7), the second thin-core fibers (8), the second single-mode fiber (10)；
First end of described first single-mode fiber (2) connects the outfan of described wideband light source (1)；Second end of described first single-mode fiber (2) connects the first end of described first thin-core fibers (4), and the connection end of described first single-mode fiber (2) and described first thin-core fibers (4) is as the first fusion point (3)；
Described thin core ultra-long-period fiber grating (6) is connected between the second end and first end of described second thin-core fibers (8) of described first thin-core fibers (4)；Second end of described second thin-core fibers (8) connects the first end of described second single-mode fiber (10), and the connection end of described second thin-core fibers (8) and described second single-mode fiber (10) is as the second fusion point (9)；
Described first graphene film (5) and described second graphene film (7) are symmetrically arranged at the two ends of described thin core LPFG (6)；And described first graphene film (5) is nonseptate wraps on described first thin-core fibers (4), described second graphene film (7) is nonseptate to be wrapped on described second thin-core fibers (8), the cladding mode not mating for elimination because of thin-core fibers and single-mode fiber mode field and inspiring so that the spectrum entering described thin core ultra-long-period fiber grating (6) is pure transmission spectrum.
2. Curvature Optical Fiber Sensor as claimed in claim 1, it is characterised in that described Fibre Optical Sensor also includes that spectrogrph (11), the input of described spectrogrph (11) are connected to the second end of described second single-mode fiber (10)；Described spectrogrph (11) is for showing the transmission spectrum of described thin core ultra-long-period fiber grating.
3. Curvature Optical Fiber Sensor as claimed in claim 1 or 2, it is characterized in that, first end of the first end of described first thin-core fibers (4) and the two port core welding of described first single-mode fiber (2), the second end of described second thin-core fibers (8) and described second single-mode fiber (10) is to core welding.
4. the Curvature Optical Fiber Sensor as described in any one of claim 1-3, it is characterised in that the length of described first thin-core fibers (4) and described second thin-core fibers (8) is equal, is 2cm～5cm.
5. Curvature Optical Fiber Sensor as claimed in claim 4, it is characterised in that a diameter of 62.5 μm of fibre cladding of described first thin-core fibers (4) and described second thin-core fibers (8)～100 μm.
6. the Curvature Optical Fiber Sensor as described in claim 4 or 5, it is characterised in that the fibre core diameter of described first thin-core fibers (4) and described second thin-core fibers (8) is 2 μm～6 μm.
7. the Curvature Optical Fiber Sensor as described in any one of claim 1-6, it is characterised in that a length of 2cm～5cm of described thin core ultra-long-period fiber grating (6).
8. the Curvature Optical Fiber Sensor as described in any one of claim 1-7, it is characterised in that described thin core ultra-long-period fiber grating (6) is unilateral unsymmetric structure thin core ultra-long-period fiber grating.
9. the Curvature Optical Fiber Sensor as described in any one of claim 1-8, it is characterized in that, together, thickness is 10nm～50nm, a length of 2cm～4cm for described first graphene film (5) and the thickness of the second graphene film (7) and identical length.
10. Curvature Optical Fiber Sensor as claimed in claim 1, it is characterized in that, described Curvature Optical Fiber Sensor also includes the first fixture and the second fixture, described first fixture and described second fixture fixation clamp respectively hold the first single-mode fiber (2) and second single-mode fiber (10) of described Curvature Optical Fiber Sensor, it is partially in, between described first fixture and described second fixture, the state freely stretched, and unilateral asymmetric direction is the first fixture and the second direction, fixture axis, the position of described first fixture is fixed, and described second fixture can move.
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| 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 |
| CN107063317A (en) * | 2017-04-27 | 2017-08-18 | 西南交通大学 | A kind of demodulation method of multi-core optical fiber Bragg grating curvature sensor |
| CN108168729A (en) * | 2018-01-30 | 2018-06-15 | 中国海洋大学 | Based on the cascade 2 ocean temperature sensors of thin-core fibers and standard single-mode fiber |
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| 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 |
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