CN206096413U - Insensitive magnetic field sensor of temperature based on optic fibre microcavity is filled to magnetic current body - Google Patents
Insensitive magnetic field sensor of temperature based on optic fibre microcavity is filled to magnetic current body Download PDFInfo
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Abstract
The utility model provides an insensitive magnetic field sensor of temperature based on optic fibre microcavity is filled to magnetic current body. The magnetic field sensor includes sensing head, fiber coupler, spectrum appearance and wide range light source, and wherein the sensing head comprises cascaded air chamber and magnetic current body cavity, and the absolute value of the free spectral range's of air chamber and magnetic current body cavity difference is less than 110 of magnetic current body cavity. The wide range light that the wide range light source sent gets into the sensing head through fiber coupler, and the light signal that reflects through the sensing head gets into the spectrum appearance through fiber coupler. Light signal through air chamber and the reflection of magnetic current body cavity can produce the vernier effect to the measuring sensitivity in magnetic field is greatly improved. The utility model discloses an optic fibre supporting structure is fixed on the single mode fiber and panda optic fibre of magnetic current body cavity both sides, utilizes the thermal energy effect of optic fibre support to offset the thermo -optic effect of the magnetic current body to realize temperature automatic compensation. This magnetic field sensor has the advantage that but temperature automatic compensation, compact structure, sensitivity are high, measuring range is big.
Description
Technical field
This patent is related to a kind of optical magnetic field sensors, and a kind of temperature of magnetic fluid filling optical fiber microcavity of specific design is unwise
Sense magnetic field sensor.
Background technology
Fibre optic magnetic field sensor have have a safety feature, electromagnetism interference, non-cpntact measurement, can live real-time telemetry and dynamic
Many advantages, such as state measurement range is wide.In magnetic-field measurement and analysis field, fibre optic magnetic field sensor attracts numerous scholars to carry out
Research, and will be used widely in electric power detection industry.
Magnetic fluid is to answer Development of Modern Science and a kind of superparamagnetic characteristic liquid functional material for producing, almost solids-free magnetic
The hysteresis that property material has, its refractive index linearly changes within the specific limits with externally-applied magnetic field, and is easy to and optical fiber
Combine.The magnetic field sensing technology that magnetic fluid is combined with F-P cavity can be made up based on Faraday effect magnetic field sensor Wal
Moral constant is relatively low and magnetic field sensor of based on giant magnetostrictive material is difficult to overcome the problem of hysteresis.But, due to
The thermo-optical coeffecient of magnetic fluid is very big, is higher by quartzy 2 orders of magnitude, therefore the magnetic field sensor based on magnetic fluid must eliminate temperature
The interference of degree.At present, temperature and magnetic field are realized using the method for cascaded fiber grating generally while measurement, such as document 1（Ri-
Qing Lv, Yong Zhao, Dan Wang, and Qi Wang. Magnetic Fluid-Filled Optical
Fiber Fabry–Pérot Sensor for Magnetic Field Measurement. IEEE Photonics
Technology Letters, 26(3):217-219 (2014) ）.But, the method is unfavorable for sensor miniaturization and collection
Cheng Hua, sensitivity are limited by FBG measurement sensitivities, and can shorten the measurement range of interference-type magnetic field sensor.Additionally, sending out
Bright patent（102221679 A of application number CN）The magnetic field sensor that photonic crystal fiber is filled based on magnetic fluid is disclosed, although
Decreased using the sensitivity of this sensor for temperature, but can not realize that temperature is fully compensated, and the sensor is sensitive
Degree is low.
The content of the invention
It has been given below with regard to brief overview of the present utility model, to provide with regard to some sides of the present utility model
The basic comprehension in face.It should be appreciated that this general introduction is not with regard to exhaustive general introduction of the present utility model.It is not intended to really
Fixed crucial or pith of the present utility model, nor intended limitation scope of the present utility model.Its purpose is only with letter
The form of change provides some concepts, in this, as the preamble in greater detail discussed after a while.
In consideration of it, this utility model provides a kind of temperature-insensitive magnetic field sensing that optical fiber microcavity is filled based on magnetic fluid
Device, at least to solve the problems, such as that the existing magnetic field sensor based on magnetic fluid is sensitive to Temperature cross-over and sensitivity is low.
According to one side of the present utility model, there is provided a kind of temperature-insensitive that optical fiber microcavity is filled based on magnetic fluid
Magnetic field sensor, the temperature-insensitive magnetic field sensor that should fill optical fiber microcavity based on magnetic fluid include sensing head, fiber coupling
Device, spectrogrph and wide spectrum light source；The wide spectrum optical that wide spectrum light source sends enters sensing head, Jing sensing heads after fiber coupler
The optical signal of reflection enters spectrogrph by fiber coupler.
Further, sensing head includes the first single-mode fiber part, the first hollow-core fiber part, the second single-mode fiber portion
Point, the second hollow-core fiber part, panda optic fibre part and structure of fiber_optic part；Wherein, one end of the first single-mode fiber part
With the one of one end phase welding of the first hollow-core fiber part, the other end of the first hollow-core fiber part and the second single-mode fiber part
End phase welding, the inside of the first hollow-core fiber part is air chamber；The other end of the second single-mode fiber part and the second hollow light
One end phase welding of fine part, the other end and the phase welding of panda optic fibre part, second hollow-core fiber of the second hollow-core fiber part
Partial interior is magnetic current body cavity；Be provided with a side opening on the side of panda optic fibre part, the side opening only with panda optic fibre part
One of two pores are connected；Pore on the exposed ends end face of panda optic fibre part, being connected with side opening is closed.
Further, the length of the first hollow-core fiber part is 50 μm -200 μm, and the wall thickness of the first hollow-core fiber part is
20μm-50μm；The length of the second hollow-core fiber part is 50 μm -100 μm, and the wall thickness of the second hollow-core fiber part is 1 μm of -10 μ
m；First single-mode fiber segment outer radius, the first hollow-core fiber segment outer radius, the second single-mode fiber segment outer radius, the second hollow-core fiber
The external diameter of segment outer radius and panda optic fibre part is 125 μm；The inside of the first hollow-core fiber part is air chamber, and second is empty
The inside of core fibre part is magnetic current body cavity, and the absolute value of the difference of the Free Spectral Range of the air chamber and magnetic current body cavity is less than
The 1/10 of the magnetic current body cavity Free Spectral Range；In the covering of panda optic fibre part, two hole diameters are 10 μm -20 μm, two
Pore center distance is 25 μm -60 μm, and the length of panda optic fibre part is 10mm-20mm, the side opening diameter dimension of panda optic fibre
For 5 μm -20 μm, side opening is apart from panda optic fibre part and the fusion point 2mm-5mm of the second hollow-core fiber part.
Further, structure of fiber_optic one end is fixed on the second single-mode fiber, and the other end is fixed on panda optic fibre, and should
Two fixing ends are 1mm-10mm with the distance of the second hollow-core fiber part, and the sectional dimension of structure of fiber_optic is 10mm × 10mm.
Further, the spectral region of wide spectrum light source is 1300nm-1600nm.
The temperature-insensitive magnetic field sensor that optical fiber microcavity is filled based on magnetic fluid of the present utility model employs air chamber
With the mode of magnetic current body cavity cascade, the sensor is made relative to single magnetic current body cavity magnetic field sensor using cascade cursor effect
（Such as 102221679 A of patent of invention CN）Magnetic-field measurement sensitivity improves the 1-2 order of magnitude.Additionally, of the present utility model
The magnetic field sensor that fiber F-P cavity is filled based on magnetic fluid devises a structure of fiber_optic structure, using the thermal expansion of structure of fiber_optic
Effect can be completely counterbalanced by the thermo-optic effect of magnetic fluid, solve sensitive to Temperature cross-over based on magnetic fluid filled-type magnetic field sensor
Problem.Relative to the method for series connection FBG（Such as document 1, Ri-Qing Lv, Yong Zhao, Dan Wang, and Qi
Wang. Magnetic Fluid-Filled Optical Fiber Fabry–Pérot Sensor for Magnetic
Field Measurement. IEEE Photonics Technology Letters, 26(3):217-219 (2014) ）,
This temperature compensation compact conformation, sensitivity height, measurement range are big.
By the detailed description below in conjunction with accompanying drawing to most preferred embodiment of the present utility model, it is of the present utility model these with
And other advantages will be apparent from.
Description of the drawings
This utility model can by reference to being better understood below in association with the description given by accompanying drawing, wherein
In all of the figs using same or analogous reference representing same or like part.The accompanying drawing is together with
The detailed description in face is included in this manual together and forms the part of this specification, and is used for further illustrating
Bright preferred embodiment of the present utility model and explanation principle and advantage of the present utility model.In the accompanying drawings：
Fig. 1 is illustrate the temperature-insensitive magnetic field sensor that optical fiber microcavity is filled based on magnetic fluid of the present utility model one
The structural representation of individual example；
Fig. 2 is the schematic diagram of a kind of possible structure for illustrating the sensing head shown in Fig. 1；
Fig. 3 is illustrated for making a kind of flow process of exemplary process of the manufacture method of sensing head of the present utility model
Figure；
Fig. 4 is to illustrate that air chamber cascades four beam interference models with magnetic current body cavity；
Fig. 5 is to illustrate that air chamber cascades interference spectrum envelope variation with magnetic current body cavity.
It will be appreciated by those skilled in the art that element in accompanying drawing is just for the sake of illustrating for the sake of simple and clear,
And be not necessarily drawn to scale.For example, in accompanying drawing, the size of some elements may be exaggerated relative to other elements, with
Just it is favorably improved the understanding to this utility model embodiment.
Specific embodiment
One exemplary embodiment of the present utility model is described hereinafter in connection with accompanying drawing.Rise for clarity and conciseness
See, do not describe all features of actual embodiment in the description.It should be understood, however, that developing any this reality
Many decisions specific to embodiment must be made during embodiment, to realize the objectives of developer, example
Such as, meet those related to system and business restrictive condition, and these restrictive conditions may be with embodiment not
Change together.Additionally, it also should be appreciated that, although development is likely to be extremely complex and time-consuming, but to having benefited from
For those skilled in the art of present disclosure, this development is only routine task.
Here, in addition it is also necessary to which explanation is a bit, in order to avoid this utility model has been obscured because of unnecessary details, attached
Illustrate only in figure with according to the closely related apparatus structure of scheme of the present utility model and/or process step, and eliminate
The other details little with this utility model relation.
Embodiment of the present utility model provides a kind of temperature-insensitive magnetic field for filling optical fiber microcavity based on magnetic fluid and passes
Sensor, the temperature-insensitive magnetic field sensor that should fill optical fiber microcavity based on magnetic fluid include sensing head, fiber coupler, spectrum
Instrument and wide spectrum light source；The wide spectrum optical that wide spectrum light source sends enters sensing head after fiber coupler, the reflection of Jing sensing heads
Optical signal enters spectrogrph by fiber coupler.
Describe the temperature-insensitive magnetic field for filling optical fiber microcavity based on magnetic fluid of the present utility model to pass with reference to Fig. 1
One example of sensor 100.As shown in figure 1, the temperature-insensitive magnetic that optical fiber microcavity is filled based on magnetic fluid of the present utility model
Field sensor includes wide spectrum light source 1-1, fiber coupler 1-2, sensing head 1-3 and spectrogrph 1-4.Wide spectrum light source 1-1 passes through
Optical fiber connects fiber coupler 1-2, and fiber coupler 1-2 connects sensing head 1-3 by optical fiber, and spectrogrph 1-4 is also by light
Fine connection fiber coupler 1-2.So, the wide spectrum optical that wide spectrum light source 1-1 sends enters sensing head after fiber coupler 1-2
The optical signal of 1-3, Jing sensing head 1-3 reflections enters spectrogrph 1-4 by fiber coupler 1-2.Wherein, wide spectrum light source 1-1
Spectral region is, for example, 1300nm-1600nm.
According to a kind of implementation, as shown in Fig. 2 sensing head 1-3 can including the first single-mode fiber part 2-1, first
Hollow-core fiber part 2-2, the second single-mode fiber part 2-3, the second hollow-core fiber part 2-4, panda optic fibre part 2-5 and light
Fine holder part 2-6；Wherein, one end of the first single-mode fiber part 2-1 is mutually melted with one end of the first hollow-core fiber part 2-2
Connect, one end phase welding of the other end of the first hollow-core fiber part 2-2 and the second single-mode fiber part 2-3；Second single-mode fiber
One end phase welding of the other end of part 2-3 and the second hollow-core fiber part 2-4, the other end of the second hollow-core fiber part 2-4
With the 2-5 phase weldings of panda optic fibre part；A hole is provided with the side of panda optic fibre part 2-5, as panda optic fibre part 2-5
Side opening, the side opening is only connected with one of two pores of panda optic fibre part 2-5；The exposed ends of panda optic fibre part 2-5
（It is its that end not with the second hollow-core fiber part 2-4 weldings）Pore on end face, being connected with side opening is closed（For example
The pore is blocked by resin glue）；The inside of the first hollow-core fiber part 2-2 be air chamber, the second hollow-core fiber part 2-4
Inside be magnetic current body cavity, and the absolute value of the difference of the Free Spectral Range of the air chamber and magnetic current body cavity be less than the magnetic current body cavity
The 1/10 of Free Spectral Range；One end of structure of fiber_optic part 2-6 is fixed on the second single-mode fiber part 2-3, and the other end is solid
It is scheduled on the 2-5 of panda optic fibre part, and two fixing ends is 1mm-10mm with the distance of the second hollow-core fiber part 2-4.
Wherein, the length of the first hollow-core fiber part 2-2 is 50 μm -200 μm, and wall thickness is 20 μm -50 μm, the second hollow light
The length of fine part 2-4 is 50 μm -100 μm, and wall thickness is 1 μm -10 μm；First single-mode fiber part 2-1 external diameters, the first hollow light
Fine part 2-2 external diameters, the second single-mode fiber part 2-3 external diameters, the second hollow-core fiber part 2-4 external diameters and panda optic fibre part
The external diameter of 2-5 is identical, is 125 μm；In the covering of panda optic fibre part 2-5, two hole diameters are 10 μm -20 μm, two gas
Hole center distance is, for example, 25 μm -60 μm, and the length of panda optic fibre part 2-5 is, for example, 10mm-20mm；The side opening of panda optic fibre
A diameter of 5 μm -20 μm, panda optic fibre side opening is apart from panda optic fibre part 2-5 and the fusion point of the second hollow-core fiber part 2-4
2mm-5mm；The sectional dimension of structure of fiber_optic 2-6 is 10mm × 10mm.
It is of the present utility model the temperature-insensitive magnetic field sensor of optical fiber microcavity is filled using air chamber based on magnetic fluid and
The mode of magnetic current body cavity cascade, makes the sensor relative to single magnetic current body cavity magnetic field sensor using cascade cursor effect（Example
Such as 102221679 A of patent of invention CN）Magnetic-field measurement sensitivity improves the 1-2 order of magnitude.Additionally, base of the present utility model
The magnetic field sensor that fiber F-P cavity is filled in magnetic fluid devises the miniature supporting structure of an optical fiber, using the hot swollen of structure of fiber_optic
Swollen effect offsets the thermo-optic effect of magnetic fluid, and the magnetic field sensor solved based on magnetic fluid filling F-P cavity is quick to Temperature cross-over
The problem of sense.
Describe for making the processing stream of an example of the manufacture method of sensing head of the present utility model with reference to Fig. 3
Journey 300.
As shown in figure 3, after handling process 300 starts, execution step S310.
In step S310, the first single-mode fiber of target and target the first hollow-core fiber welding are adopted and welding two
Identical strength of discharge during single-mode fiber.Then execution step S320.
In step s 320, the fusion point with the first single-mode fiber of target and the first hollow-core fiber of target is as starting point, in mesh
One section of hollow-core fiber of intercepting on the first hollow-core fiber is marked, the free end of this section of hollow-core fiber is melted with the second single-mode fiber of target
Connect, using 1/3 to 2/3 of strength of discharge during two single-mode fibers of welding, with the first single-mode fiber of target and mesh
Mark one air chamber of formation between the second single-mode fiber.Then execution step S330.
In step S330, the second single-mode fiber of target and target the second hollow-core fiber welding are adopted and welding two
Identical strength of discharge during single-mode fiber.Then execution step S340.
In step S340, the fusion point with the second single-mode fiber of target and the second hollow-core fiber of target as starting point, in mesh
One section of hollow-core fiber of intercepting on the second hollow-core fiber is marked, the free end of this section of hollow-core fiber and target panda optic fibre welding are adopted
When strength of discharge is two single-mode fibers of welding 1/3 to 2/3；Moving fiber makes second hollow of electrode alignment of heat sealing machine
The center of fiber section, discharges 3-5 time, 1/3 to 2/3 when the strength of discharge for adopting is for two single-mode fibers of welding, so that the
The wall thickness of two hollow-core fibers is reduced to 1 μm -10 μm.Then execution step S350.
In step S350, the fusion point with the second hollow-core fiber of target and target panda optic fibre as starting point, in target Bearss
One section of panda optic fibre is intercepted on cat optical fiber.Then execution step S360.
In step S360, a side opening is opened on the side of target panda optic fibre, make side opening only with target panda optic fibre
One in two pores is connected.Then execution step S370.
In step S370, under the microscope the free end end face of target panda optic fibre is amplified, will be connected with side opening
The pore of target panda optic fibre block.Then execution step S380.
In step S380, the free end of target panda optic fibre is inserted in magnetic fluid, and makes the side of target panda optic fibre
Hole exposes in atmosphere, magnetic fluid is filled in the second hollow-core fiber part using capillarity so as to become magnetic current body cavity.
Then execution step S390.
In step S390, one end of structure of fiber_optic is fixed with the second single-mode fiber, and the other end is solid with panda optic fibre
It is fixed.Handling process 300 terminates.
According to a kind of implementation, the length of the one section of hollow-core fiber intercepted on the first hollow-core fiber of target is 50 μm-
200 μm, wall thickness is 20 μm -50 μm, and the length of air chamber is 50 μm -200 μm；One section intercepted on the second hollow-core fiber of target
The length of hollow-core fiber is 50 μm -100 μm, and wall thickness is 1 μm -10 μm, and the length of magnetic current body cavity is 50 μm -100 μm；Air chamber and
The optical path difference of magnetic current body cavity is less than 10 wavelength；The external diameter of target panda optic fibre and the external diameter of the first single-mode fiber of target, the second list
The external diameter of the external diameter of mode fiber, the external diameter of the first hollow-core fiber and the second hollow-core fiber is 125 μm；Target panda optic fibre
Length is 10mm-20mm, and in the covering of target panda optic fibre, two hole diameters are 10 μm -20 μm, two pore center distances
For 25 μm -60 μm；A diameter of 5 μm -20 μm of panda optic fibre side opening, the side opening distance objective panda optic fibre and the second hollow of target
The fusion point 2mm-5mm of optical fiber.
Experimental data shows that the sensing head made using above method can not only improve the measurement sensitivity in magnetic field, and
And can be with compensation temperature to magnetic-field measurement impact.
Using example 1
The temperature-insensitive magnetic field sensor 100 that optical fiber microcavity is filled based on magnetic fluid of the present utility model is described below
One is applied example.
Under the influence of a magnetic field, magnetic fluid can produce mangneto and sell off effect, and its refractive index changes with the change in magnetic field, enters
And cause the change of optical fiber microcavity light path, so that the interference spectrum translation of optical fiber microcavity, by detecting the big of interference spectrum translation
The little size that can obtain tested magnetic field.
Wide spectrum light source 1-1 adopt ASE light sources, its spectral region be 1300nm-1600nm, 1 × 2 light of wide spectrum optical Jing for sending
Fine bonder（As the example of fiber coupler 1-2）Afterwards, into sensing head 1-3（Air chamber and magnetic current body cavity）, Jing sensing heads
The optical signal of 1-3 reflections enters spectrogrph 1-4 by above-mentioned 1 × 2 fiber coupler, is then realized to signal by computer again
Process.
The temperature-insensitive magnetic field sensor 100 that optical fiber microcavity is filled based on magnetic fluid of the present utility model is based on air
Chamber and magnetic current body cavity cascade four beam interference principles realize, Interference Model as shown in figure 4, therefore, spectrogrph 1-4 is received
Interference spectrum signal can be expressed as：
Formula one：
In formula one,E 1、E 2、E 3WithE 4Respectively incident illumination is in reflecting surfaceE 1、E 2、E 3WithE 4On reflected light complex amplitude,I
Light intensity is composed for four beam interferences.The Free Spectral Range Δ of air chamberλ FSR1With the Free Spectral Range Δ of magnetic current body cavityλ FSR2It is full
Sufficient Δλ FSR1≈Δλ FSR2When, four beam interference spectrum are presented peak envelope phenomenon as shown in Figure 5, and peak envelope is with magnetic current
The change of body refractive index and move.Peak envelope amount of movement Δλ BL With the variation relation of magnetic fluid refractive index it is
Formula two：
In formula two,λ i For the oscillation wavelength of magnetic current body cavity, Δn MF For the variable quantity of magnetic fluid refractive index.With single magnetic current
Body cavity is compared, and the sensitivity after air chamber and the cascade of magnetic current body cavity is increasedMTimes,MValue typically takes 10≤M≤40。
There is magnetic fluid mangneto to sell off characteristic, and magnetic field sensor 100 is exactly to realize magnetic field using this characteristic of magnetic fluid
Sensing.Under the influence of a magnetic field, magnetic fluid can produce mangneto and sell off effect, and its refractive index changes with the change in magnetic field, enters
And cause the change of magnetic current body cavity light path, so that the interference spectrum translation of cascade air chamber and magnetic current body cavity, dry by detection
The size in tested magnetic field is obtained by relating to the size of spectrum translation.Substantially increased by the way of air chamber and the cascade of magnetic current body cavity
Magnetic-field measurement sensitivity, relative to single magnetic current body cavity magnetic field sensor（Such as 102221679 A of patent of invention CN）Magnetic field is surveyed
Amount sensitivity improves the 1-2 order of magnitude.
Using example 2
The temperature-insensitive magnetic field sensor 100 that optical fiber microcavity is filled based on magnetic fluid of the present utility model is described below
Sensing head temperature compensation principle.
Transducing head structure is as shown in Figure 2.Rectangle structure of fiber_optic two ends are separately fixed at the second single-mode fiber and panda optic fibre
On, and two the second hollow-core fibers of fixing end distance have a certain distance.
High two orders of magnitude of thermo-optical coeffecient ratio quartz of magnetic fluid, therefore, the magnetic field sensor based on magnetic current body cavity is necessary
Consider the interference problem of temperature.This patent devises structure of fiber_optic structure, offsets magnetic current using the thermal expansion effects of structure of fiber_optic
The thermo-optic effect of body.Analysis temperature compensation principle below：
The change of the magnetic current body cavity light path that magnetic fluid thermo-optic effect causes is turned to
Formula three：
In formula three, ΔnThe change of the magnetic fluid refractive index caused for temperature,dFor the length of magnetic current body cavity,αFor magnetic current
The thermo-optical coeffecient of body, ΔTFor the variable quantity of temperature.
From thermal expansion much larger than quartz metal as structure of fiber_optic, structure of fiber_optic pulls on optical fiber when a temperature increases
Extend which.Due to the wall thickness of the second hollow-core fiber part it is very thin（Between 1 m-10 m）, therefore, its elastic modelling quantity is much smaller than
The elastic modelling quantity of panda optic fibre, therefore under structure of fiber_optic pulling force effect, the strain of the second hollow-core fiber part is much larger than second
Single-mode fiber part and panda optic fibre part, cause the change of magnetic current body cavity light path to turn to
Formula four：
In formula four,nFor the refractive index of magnetic fluid, ΔdFor the elongation of magnetic current body cavity under pulling force effect,γFor optical fiber
The thermal coefficient of expansion of frame material,a<1 is the ratio of single-mode fiber and the elastic modelling quantity of hollow-core fiber,b<1 is panda optic fibre and hollow
The ratio of the elastic modelling quantity of optical fiber,DFor the interior length of structure of fiber_optic.
When the thermo-optic effect of thermal expansion effects and magnetic fluid is cancelled out each other, the variable quantity of magnetic current body cavity light path is zero, i.e.,
Formula five：
Formula three and formula four are substituted into formula five to obtain：
Formula six：
As long as formula six is met, you can realize temperature self-compensation.By control the second hollow-core fiber wall thickness with
And the interior length of structure of fiber_optic can ensure that sensing head meets formula six.
The temperature-insensitive magnetic field sensor that optical fiber microcavity is filled based on magnetic fluid of the present utility model utilizes structure of fiber_optic
Thermal expansion effects completely cancel out the thermo-optic effect of magnetic fluid, solve based on magnetic fluid filled-type magnetic field sensor to temperature
The problem of cross sensitivity.Relative to the method for series connection FBG（Such as document 1, Ri-Qing Lv, Yong Zhao, Dan Wang,
and Qi Wang. Magnetic Fluid-Filled Optical Fiber Fabry–Pérot Sensor for
Magnetic Field Measurement. IEEE Photonics Technology Letters, 26(3):217-219
(2014) ）, the temperature compensation compact conformation, sensitivity height, measurement range are big.
Using example 3
Pass described below for the temperature-insensitive magnetic field for filling optical fiber microcavity based on magnetic fluid of the present utility model is made
One of the sensing head of sensor 100 applies example.
First, by general single mode fiber（As the example of the first single-mode fiber of target）With hollow-core fiber（As target
The example of one hollow-core fiber）Welding, the strength of discharge that welding is adopted are strong with two general single mode fibers of welding under normal circumstances
Degree is identical.
Then, as starting point, on hollow-core fiber, intercepted length is in 50 μ for the fusion point with general single mode fiber and hollow-core fiber
One section of hollow-core fiber between m-200 μm, by the free end and general single mode fiber of this section of hollow-core fiber（It is single as target second
The example of mode fiber）Welding.Fusion point with hollow-core fiber and general single mode fiber is intercepted on general single mode fiber as starting point
One section general single mode fiber of the length between 1mm-10mm.
Then, by general single mode fiber and hollow-core fiber（As the example of the second hollow-core fiber of target）Welding, welding are adopted
Strength of discharge is identical with the intensity of two general single mode fibers of welding under normal circumstances.
Then, moving fiber makes the center of the second hollow-core fiber of electrode alignment part of heat sealing machine, discharges 3-5 time, adopts
Strength of discharge be two single-mode fibers of welding when 1/3 to 2/3 so that the wall thickness of the second hollow-core fiber is reduced to 1
μm-10μm。
Then, the fusion point with general single mode fiber and the second hollow-core fiber is as starting point, the intercepted length on hollow-core fiber
One section of hollow-core fiber between 50 μm -100 μm, by the free end and panda optic fibre of this section of hollow-core fiber（As target panda
The example of optical fiber）Welding.Wherein, the outside dimension of panda optic fibre, general single mode fiber and hollow-core fiber is identical, is 125 μ
M, in panda optic fibre covering, diplopore is a diameter of 10 μm -20 μm, and diplopore center distance is 25 μm -60 μm.Hollow-core fiber and panda light
The strength of discharge that fine welding is adopted be the strength of discharge of two general single mode fibers of welding under normal circumstances 1/3 to 2/
3.So, the optical fiber microcavity that length is at 50 μm -100 μm will be formed between general single mode fiber and panda optic fibre（As mesh
The example of mark magnetic current body cavity）.
Then, the fusion point with general single mode fiber and panda optic fibre intercepts a segment length on panda optic fibre as starting point
Panda optic fibre between 10mm-20mm, then at the fusion point 2mm-5mm apart from general single mode fiber with panda optic fibre
An aperture is opened on the side of panda optic fibre（Can femtosecond laser beat this hole）So as to only with two pores of panda optic fibre in a phase
Connection.
Then, under the microscope the end face of panda optic fibre is amplified, the panda optic fibre being connected with side opening with resin glue
Pore block.
Then, by the free end insertion magnetic fluid of panda optic fibre, it is ensured that the side opening of panda optic fibre exposes in atmosphere, profit
Magnetic fluid is filled in optical fiber microcavity with capillarity.
Finally, by structure of fiber_optic（As the example of target structure of fiber_optic）One end be fixed on the second single-mode fiber, separately
One end is fixed on panda optic fibre, and ensures that the distance between two fixing ends areLAnd two fixing point to the second hollow-core fiber portion
The distance divided is identical.
Obtained sensing head has structure as shown in Figure 2 therefrom, as shown in Fig. 2 in the sensing head made by, target
Corresponding to the first single-mode fiber part 2-1 shown in Fig. 2, the part of the first hollow-core fiber of target is right for the part of the first single-mode fiber
Should be single corresponding to second shown in Fig. 2 in the first hollow-core fiber part 2-2 shown in Fig. 2, the part of the second single-mode fiber of target
Mode fiber part 2-3, the part of the second hollow-core fiber of target is corresponding to the second hollow-core fiber part 2-4 shown in Fig. 2, target Bearss
The part of cat optical fiber is corresponding to the panda optic fibre part 2-5 shown in Fig. 2, and the part of target structure of fiber_optic is corresponding to shown in Fig. 2
Structure of fiber_optic part 2-6.
Although this utility model is described according to the embodiment of limited quantity, benefit from above description, this technology
It is in field it is clear for the skilled person that in the range of this utility model for thus describing, it can be envisaged that other embodiments.Additionally,
It should be noted that language used in this specification primarily to the purpose of readable and teaching and select, rather than in order to
Explain or limit theme of the present utility model and select.Therefore, without departing from the scope of the appended claims and spirit
In the case of, many modifications and changes will be apparent from for those skilled in the art.For this
The scope of utility model, the disclosure done to this utility model are illustrative and not restrictive, scopes of the present utility model
It is defined by the appended claims.
Claims (5)
1. the temperature-insensitive magnetic field sensor of optical fiber microcavity is filled based on magnetic fluid, it is characterised in that described based on magnetic fluid
The temperature-insensitive magnetic field sensor of filling optical fiber microcavity includes sensing head, fiber coupler, spectrogrph and wide spectrum light source；
Wherein, described sensing head include the first single-mode fiber part, the first hollow-core fiber part, the second single-mode fiber part,
Second hollow-core fiber part, panda optic fibre part and structure of fiber_optic part；Described structure of fiber_optic one end is fixed on described second
On single-mode fiber part, the structure of fiber_optic other end is fixed on the panda optic fibre part, and described two fixing end with
The distance of the second hollow-core fiber part is 1mm-10mm；
Wherein, the inside of the first hollow-core fiber part is air chamber, and the inside of the second hollow-core fiber part is magnetic current
Body cavity, and the absolute value of the difference of the Free Spectral Range of the air chamber and magnetic current body cavity is less than the magnetic current body cavity Free Spectral Range
1/10；
Wherein, the wide spectrum optical that the wide spectrum light source sends enters the sensing head, biography described in Jing after the fiber coupler
The optical signal of sense head reflection enters the spectrogrph by the fiber coupler.
2. it is according to claim 1 based on magnetic fluid fill optical fiber microcavity temperature-insensitive magnetic field sensor, its feature
It is, one end phase welding of one end of the first single-mode fiber part and the first hollow-core fiber part, described first is empty
One end phase welding of the other end of core fibre part and the second single-mode fiber part, the first hollow-core fiber partial interior
For air chamber；One end phase welding of the other end of the second single-mode fiber part and the second hollow-core fiber part, it is described
The other end of the second hollow-core fiber part and the panda optic fibre part phase welding, the second hollow-core fiber partial interior are magnetic
Fluid cavity；A side opening, the side opening two only with the panda optic fibre part are provided with the side of the panda optic fibre part
One of pore is connected；Pore in the exposed end face of the panda optic fibre part, being connected with the side opening is closed.
3. according to any one of claim 1-2 based on magnetic fluid fill optical fiber microcavity temperature-insensitive magnetic field sensing
Device, it is characterised in that the length of the first hollow-core fiber part is 50 μm -200 μm, the wall of the first hollow-core fiber part
Thick is 20 μm -50 μm；The length of the second hollow-core fiber part be 50 μm -100 μm, the second hollow-core fiber part it is interior
Footpath is 1 μm -10 μm；The external diameter of the first hollow-core fiber part, the external diameter of the second hollow-core fiber part, first list
The external diameter of the external diameter of mode fiber part, the external diameter of the second single-mode fiber part and the panda optic fibre part is 125 μ
m；The length of the panda optic fibre part is 10mm-20mm, and in the covering of the panda optic fibre part, two hole diameters are 10 μ
M-20 μm, described two pore center distances are 25 μm -60 μm；The side opening of the panda optic fibre is a diameter of 5 μm -20 μm, described
Fusion point 2mm-5mm of the side opening apart from the panda optic fibre part and the hollow-core fiber part.
4. it is according to claim 1 based on magnetic fluid fill optical fiber microcavity temperature-insensitive magnetic field sensor, its feature
It is that the sectional dimension of the structure of fiber_optic is 10mm × 10mm.
5. it is according to claim 1 based on magnetic fluid fill optical fiber microcavity temperature-insensitive magnetic field sensor, its feature
It is that the spectral region of the wide spectrum light source is 1300nm-1600nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632276A (en) * | 2017-09-07 | 2018-01-26 | 于盟盟 | A kind of magnetic field sensing system based on giant magnetostrictive thin film |
| CN112649402A (en) * | 2020-11-24 | 2021-04-13 | 哈尔滨工程大学 | Liquid crystal laser type VOC gas optical fiber sensing device and manufacturing method |
-
2016
- 2016-09-20 CN CN201621062753.6U patent/CN206096413U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632276A (en) * | 2017-09-07 | 2018-01-26 | 于盟盟 | A kind of magnetic field sensing system based on giant magnetostrictive thin film |
| CN112649402A (en) * | 2020-11-24 | 2021-04-13 | 哈尔滨工程大学 | Liquid crystal laser type VOC gas optical fiber sensing device and manufacturing method |
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