CN109116272A - A kind of big bandwidth magnetic field sensor and preparation method based on cone optical-fiber grating - Google Patents
A kind of big bandwidth magnetic field sensor and preparation method based on cone optical-fiber grating Download PDFInfo
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- CN109116272A CN109116272A CN201811126527.3A CN201811126527A CN109116272A CN 109116272 A CN109116272 A CN 109116272A CN 201811126527 A CN201811126527 A CN 201811126527A CN 109116272 A CN109116272 A CN 109116272A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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Abstract
Aiming at the problem that bandwidth all relative narrowers for the optical signal that magnetic field sensor in the prior art obtains, the invention proposes a kind of big bandwidth magnetic field sensor and preparation method based on cone optical-fiber grating, including glass capillary, cone optical-fiber grating and magnetic fluid；It is characterized by: cone optical-fiber grating includes the sequentially connected entering light section for receiving incident light wave, stretch section, light section and several fiber gratings out for exporting light wave；Wherein, stretch section includes sequentially connected first rotary table section, cylindrical section and the second rotary table section；Wherein, fiber grating is uniformly arranged on the middle part in glass capillary and fiber grating is scribed at the reducer of the second rotary table section.The configuration of the present invention is simple, makes that present invention obtains the bandwidth of biggish optical signal by the reducer that the second rotary table section is arranged in fiber grating.
Description
Technical field
The invention belongs to the sensory field of optic fibre in information technology, and in particular to one kind based on cone optical-fiber grating (TFBG:
Taper Fiber Bragg grating) big bandwidth magnetic field sensor, it is wide to effectively increase optical signal browband, Yi Jiqi
Preparation method.
Background technique
All there is magnetic field or information relevant to magnetic field in many places of nature and human society life.In current letter
In breath society, magnetic field sensor has become indispensable base components in information technology and information industry.Currently, people have ground
The magnetic field sensor using various physics, chemistry and biological effect is produced, and in each side of scientific research, production and social life
Face is used widely, and the probing into various information of the task is born.
Previous magnetic field sensor is the progress with magnetic measurement apparatus and is gradually developed.In numerous survey magnetism methods,
Magnetic Field is mostly become electric signal to measure." probe " or " sampler " is exactly magnetic field sensing in magnetic measurement apparatus
Device.Traditional magnetic field sensor has magnetic method, electromagnetic induction method, galvanomagnetic-effect method, and Pumping Magnetic Resonance Method etc., these are mostly based on energization
Coil or metal and semiconductor structure etc..With information industry, industrial automation, communications and transportation, power electronic technique, office
The rapid development of automation, household electrical appliance, Medical Instruments etc. and popularizing for Iron ore concentration, need to use a large amount of sensor
The non-electric parameter that will need to be measured and control.It is based on the demand, optical fiber type magnetic field sensor is paid close attention to
And research and development.
Moreover, compared with traditional electricity formula magnetic field sensor, fibre optical sensor have it is small in size, low in energy consumption, be easy to group
The advantages that net transmission.
Currently, the magnetic field sensor of optical fiber type has begun gradually functionization, it is main using magnetic fluid modulated optical signal
One of method.Magnetic fluid is a kind of novel functional material, and evaporation rate is related with carrier fluid, while when there are external magnetic fields
When, the solid particle of the inside of magnetic fluid can occur aggregation and align along outer magnetic field direction effect, so as to cause magnetic
The refractive index of fluid changes.
Specific mode is such as: a kind of fibre optic magnetic field sensor based on twin-core fiber microchannel and magnetic fluid
(CN207352076U), it is formed and is interfered using twin-core fiber, and interfere arm is detected all the way with magnetic fluid regulation；Magnetic fluid packet
The magnetic field sensor (CN207281263U) for covering micro-nano fiber grating sensing head, using magnetic fluid to the optical fiber light of HF acid corrosion
Grid are coated, according to the change detection magnetic field of magnetic fluid refractive index.
In addition, such as a kind of magnetic field sensor and measurement method based on photonic crystal fiber and grating
(CN201711260749.X), nanogold grating is processed in the side of photonic crystal fiber with lithographic method, then uses magnetic fluid
Metal grating is coated, magnetic field is detected according to the excitation situation of surface phasmon.
And a kind of magnetic field sensor (CN107064827A) based on shaddock type optical fiber and bragg grating, it fills out
Fluid magnetize into shaddock type optical fiber, signal is reflected using the reflectance signature wavelength of fiber grating, to obtain magnetic field signal.
In above-mentioned patent, it is limited to the characteristic of fiber bragg grating, the optical signal that these magnetic field sensors obtain
Bandwidth all relative narrowers, light are only existed in lesser wave-length coverage by energy after magnetic field modulation；And ordinary optic fibre grating disappears
Die a very little, small with the interaction energy of magnetic fluid.
Summary of the invention
Aiming at the problem that bandwidth all relative narrowers for the optical signal that magnetic field sensor in the prior art obtains, the present invention is mentioned
Go out a kind of big bandwidth magnetic field sensor and preparation method based on cone optical-fiber grating, can effectively increase bandwidth, and energy
The interaction of enhancing and magnetic fluid, forms a kind of optical fiber type magnetic field sensor that structure is more compact.
In order to achieve the above object, the technical scheme adopted by the invention is that: a kind of big band based on cone optical-fiber grating
Cone optical-fiber grating and setting in glass capillary are arranged in including glass capillary, co-axial seal for wide magnetic field sensor
The magnetic fluid being full of in glass capillary；It is characterized by: cone optical-fiber grating includes sequentially connected for receiving incidence
The entering light section of light wave, stretch section, light section and several fiber gratings out for exporting light wave；
Wherein, stretch section is arranged in glass capillary, and entering light section extends to the outside of glass capillary with light section out；
Wherein, stretch section includes sequentially connected first rotary table section, cylindrical section and the second rotary table section；And rotary table section is big straight
Diameter end is corresponding with entering light section and is connected；The smaller diameter end of first rotary table section is corresponding with one end of cylindrical section and is connected；Second rotary table
The smaller diameter end of section is corresponding with the other end of cylindrical section and is connected；The larger diameter end of second rotary table section simultaneously phase corresponding with light section out
Even；
Wherein, fiber grating is uniformly arranged on the middle part in glass capillary and fiber grating is scribed at the variable diameter of the second rotary table section
Section.
The aluminum pipe for preventing magnetic fluid from volatilizing is coaxially arranged on the outside of the glass capillary；The aluminum pipe and entering light
Section goes out the closed setting of light section.
The internal diameter of the aluminum pipe is 0.7-1.0 mm, and outer diameter is 0.9-1.2 mm, and length is 5-6 cm.
The first rotary table section and the second rotary table section taper ratio having the same, the taper ratio are 0.24-0.4；Optical fiber
Grating length is 2-3 mm.
5. a kind of big bandwidth magnetic field sensor based on cone optical-fiber grating according to claim 1, feature exist
In: the internal diameter of glass capillary is 0.3-0.5mm, outer diameter 0.5-0.7mm, length 3-4cm.
A kind of production method of such as above-mentioned big bandwidth magnetic field sensor based on cone optical-fiber grating, it is characterised in that: packet
Include following steps:
A. single mode optical fiber is subjected to fusion drawn by phase mask plate method, then in the change of cone optical-fiber grating the second rotary table section
Diameter section inscribes fiber grating by phase mask plate method, finally obtains cone optical-fiber grating；
B. glass capillary is horizontally arranged, the cone optical-fiber grating that step A is obtained is coaxially disposed in glass capillary
Portion forms the assembly of glass capillary and cone optical-fiber grating；
C. the assembly of the glass capillary and cone optical-fiber grating that step B are obtained through capillary action, is drawn magnetic fluid, is obtained
To the filling liquid glass tube of both ends open；
D. the filling liquid glass tube horizontal of both ends open obtained in step C is stood into 15-20min, excluded in glass capillary
Then air is sealed by the first uv-curable glue by the first rotary table section, cylindrical section and the second circle at the both ends of glass capillary
Platform section is sealed in glass capillary, obtains the detector for detecting magnetic field strength；
Wherein, the cured method of uv-curable glue is by ultraviolet light irradiation 100-150 s；
E. coaxial arrangement on the outside of detector obtained in D step is prevented into the shell of magnetic fluid volatilization and the shell is purple by second
Outer solidification glue is sealed.
The working principle of the invention is: the present invention is the change for allowing to detect magnetic field strength in large bandwidth range
To change, fiber grating has been scribed at the reducer of the second rotary table section by selection, both the lumbar region position of stretch section, meanwhile, dumbbell shaped
Stretch section makes to include intermode interference peak in reflectance spectrum.It is strong magnetic fluid changing magnetic field can be obtained according to intermode interference signal
The direction of degree.Sensitivity of the invention can be further promoted simultaneously.
Stretch section since in pulling process, covering and fiber core refractive index can be reduced with the reduction of fibre diameter,
Be formed simultaneously two gradual changes lumbar region and a gentle transition region.When one end incidence of the light wave from stretch section, due to wave
The variation of guide structure will lead to light wave, and some reaches optical fiber surrounding structure, and stretch section becomes new fibre core, extraneous ring at this time
Border then becomes covering.When magnetic field changes external environment, the refractive index of magnetic fluid is set to change, to obtain reflected light signal
Loss, realize the measurement of magnetic field strength.
The beneficial effects of the present invention are: the present invention transmits light wave by stretch section, it is arranged in the reducer of the second rotary table section
Fiber grating.When the variation of refractive index, the disappearance of cooperation magnetic fluid and cone optical-fiber grating occur under magnetic fields for magnetic fluid
Field is acted on and is coupled, and is changed so as to cause the output signal of fiber grating, and signal bandwidth can achieve 2nm or more,
The signal contrast of intermode interference increases with the enhancing of magnetic field strength.The configuration of the present invention is simple, by the way that fiber grating to be arranged
Make that present invention obtains the bandwidth of biggish optical signal in the reducer of the second rotary table section.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
Fig. 2 is using monitoring system in a kind of magnetic field of the invention.
Fig. 3 is reflectance spectrum of the present invention and general uniform fiber grating reflection bandwidth comparison diagram.
Fig. 4 is the reflectance spectrum recorded by spectroanalysis instrument in the case where changing external magnetic field.
Specific embodiment
The present invention is further detailed with reference to the accompanying drawing.
The technical scheme adopted by the invention is that: such as Fig. 1, a kind of big bandwidth magnetic field sensing based on cone optical-fiber grating
Device, including internal diameter are 0.3-0.5mm, and outer diameter 0.5-0.7mm, length is the glass capillary 4 of 3-4cm, co-axial seal setting
In the cone optical-fiber grating 3 in glass capillary 4 and the magnetic fluid 5 being full of in glass capillary 4 is set；Its feature exists
In: cone optical-fiber grating 3 includes the sequentially connected entering light section 301 for receiving incident light wave, stretch section 302, for exporting
Light wave goes out light section 303 and several fiber gratings 304；
Wherein, stretch section 302 is arranged in glass capillary 4, and entering light section 301 extends to glass capillary 4 with light section 303 out
It is external；
Wherein, stretch section 302 includes sequentially connected first rotary table section 3021, cylindrical section 3022 and the second rotary table section 3023；
And the larger diameter end of rotary table section 3021 is corresponding with entering light section 301 and is connected；The smaller diameter end and cylindrical section of first rotary table section 3021
3022 one end is corresponding and is connected；The smaller diameter end of second rotary table section 3023 is corresponding with the other end of cylindrical section 3022 and is connected；
The larger diameter end of second rotary table section 3023 with light section 303 is corresponding out and is connected；Preferably, the first rotary table section 3021 and the second rotary table
3023 taper ratios having the same of section, which is that the taper ratio is 0.24-0.4, makes stretch section 302 in dumbbell shaped.
Wherein, the middle part and fiber grating 304 that fiber grating 304 is uniformly arranged in glass capillary 4 are scribed at second
The reducer of rotary table section 3023；304 length of fiber grating is 2-3 mm.
Magnetic fluid 5 volatilizees in order to prevent, is coaxially arranged in the outside of glass capillary 4 for preventing magnetic fluid 5 from volatilizing
Aluminum pipe 8；The aluminum pipe 8 and entering light section 301 go out the closed setting of light section 303；When closed, uv-curable glue can be used aluminium
Pipe 8 and entering light section 301 go out the progress glue envelope of light section 303, and utilize ultraviolet light irradiation solid glue.
A kind of production method of such as above-mentioned big bandwidth magnetic field sensor based on cone optical-fiber grating, it is characterised in that: packet
Include following steps:
A. single mode optical fiber is subjected to fusion drawn by phase mask plate method, then in 3 second rotary table section of cone optical-fiber grating
3023 reducer inscribes fiber grating 304 by phase mask plate method, finally obtains cone optical-fiber grating 3；
B. glass capillary 4 is horizontally arranged, the cone optical-fiber grating 3 that step A obtains is coaxially disposed within glass capillary 4
Middle part forms the assembly of glass capillary 4 and cone optical-fiber grating 3；
C. the assembly of the glass capillary 4 and cone optical-fiber grating 3 that step B are obtained through capillary action, draws magnetic fluid
5, obtain the filling liquid glass tube of both ends open；
D. the filling liquid glass tube horizontal of both ends open obtained in step C is stood into 15-20min, excluded in glass capillary 4
Then air seals 6,7 for the first rotary table section 3021, cylindrical section by the first uv-curable glue at the both ends of glass capillary 4
3022 and second rotary table section 3023 be sealed in glass capillary 4, obtain the detector for detecting magnetic field strength；
Wherein, uv-curable glue 6,7 cured methods are by ultraviolet light irradiation 100-150 s；
E. it will be coaxially disposed the shell for preventing magnetic fluid 5 from volatilizing on the outside of detector obtained in D step and the shell is by second
9,10 sealing of uv-curable glue envelope.
It should be clear that: the encapsulating method that the second uv-curable glue in E step seals 9,10 is identical as D step.
It should be clear that: Fig. 1 is please referred to herein with respect to the description of directionality.
Specific embodiment I: such as Fig. 1, a kind of big bandwidth magnetic field sensor based on cone optical-fiber grating is by internal diameter
0.4mm, outer diameter 0.6mm, length are that the taper in glass capillary 4 is arranged in glass capillary 4, the co-axial seal of 3.5cm
The magnetic fluid 5 that fiber grating 3 and being arranged in is full of in glass capillary 4 forms；Wherein, cone optical-fiber grating 3 is by successively connecting
Connect for receiving the entering light section 301 of incident light wave, stretch section 302, going out light section 303 and five optical fiber for export light wave
Grating 304 forms；Wherein, magnetic fluid 5 is water solubility Fe4O3, model EMG605；
Wherein, stretch section 302 is arranged in glass capillary 4, and entering light section 301 extends to glass capillary 4 with light section 303 out
It is external；
Wherein, stretch section 302 is by 3023 groups of sequentially connected first rotary table section 3021, cylindrical section 3022 and the second rotary table section
At；And the larger diameter end of rotary table section 3021 is corresponding with entering light section 301 and is connected；The smaller diameter end and circle of first rotary table section 3021
One end of shell of column 3022 is corresponding and is connected；The smaller diameter end of second rotary table section 3023 simultaneously phase corresponding with the other end of cylindrical section 3022
Even；The larger diameter end of second rotary table section 3023 with light section 303 is corresponding out and is connected；Preferably, the first rotary table section 3021 and second
The taper ratio having the same of rotary table section 3023, the taper ratio are that the taper ratio is 0.24-0.4, make stretch section 302 in dumbbell shaped.
Wherein, the middle part and fiber grating 304 that fiber grating 304 is uniformly arranged in glass capillary 4 are scribed at second
The reducer of rotary table section 3023；304 length of fiber grating is 2.5 mm.
Meanwhile aluminum pipe 8 is coaxially disposed in the outside of glass capillary 4；The aluminum pipe 8 and entering light section 301, to go out light section 303 close
Close setting；When closed, using uv-curable glue by aluminum pipe 8 and entering light section 301, go out light section 303 and carry out glue envelope, and using ultraviolet
Light irradiation 150s solid glue.
Such as Fig. 2, the present invention is in use, and such as a kind of magnetic field monitors system, in addition to big bandwidth magnetic field of the present invention passes
Sensor further includes wideband light source module 11, three end circulators 14, spectroanalysis instrument 12 and magnetic field generator 13；Wherein, optical fiber
Grating 304 is located in the magnetic field of magnetic field generator 13；The input terminal of three end circulators 14 connects wideband light source module 11；Three end
One output end of circulator 14 is connected with the entering light section 301 of cone optical-fiber grating 3；Another output of the three ends circulator 14
End connection spectroanalysis instrument 12.
It should be clear that: the principle of above-mentioned magnetic field monitoring system is: the light wave of wideband light source module 11 is via cone of light
The entering light section 301 of fine grating 3 is transmitted to out light section 303, and light wave again passes by out via magnetic fluid 5 and the reflection of fiber grating 304
Light section 303 is transmitted to out light section 303, spectroanalysis instrument 12 is transmitted to from three end circulators 14, to detect optical signal.
Such as Fig. 3, reflectance spectrum of the invention has biggish reflection bandwidth compared to general uniform fiber grating.
Such as Fig. 4, in the case where changing external magnetic field, the reflectance spectrum of the invention recorded by spectroanalysis instrument.
In conjunction with above content, it also have the advantage that the present invention uses the structure of the stretch section 302 of dumbbell shaped,
So that transducing part of the invention is more integrated, volume is smaller.
The present invention overcomes most Fbg Sensor For Measuring Magnetic Field in the prior art, the narrow problem of Measurement bandwidth, Ke Yi
The response in magnetic field is measured in large bandwidth range.
The intermode interference signal that the present invention is formed using cone optical-fiber grating 3 and the effect of magnetic fluid 5, with the change of magnetic field strength
Change, the contrast of interference fringe increases.
The present invention is in the outer secondary encapsulation of glass capillary 4 aluminum pipe 8, under the premise of not having an impact to magnetic field, not only
Fibre Optical Sensor unit is effectively protected, and effectively prevents the volatilization of magnetic fluid 5, improves stabilization of the invention
Property.
The foregoing is merely the preferred embodiment of invention, oneself, is not intended to limit the invention, all in spirit of the invention
With any modifications, equivalent replacements, and improvements made within principle etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of big bandwidth magnetic field sensor based on cone optical-fiber grating, including the setting of glass capillary (4), co-axial seal exist
The magnetic fluid (5) that cone optical-fiber grating (3) and setting in glass capillary (4) are full of in glass capillary (4)；It is special
Sign is: cone optical-fiber grating (3) includes sequentially connected for receiving entering light section (301), the stretch section of incident light wave
(302), for exporting light section (303) and several fiber gratings (304) out of light wave；
Wherein, in glass capillary (4), entering light section (301) extends to capillary with light section (303) out for stretch section (302) setting
The outside of glass tube (4)；
Wherein, stretch section (302) includes sequentially connected first rotary table section (3021), cylindrical section (3022) and the second rotary table section
(3023)；And the larger diameter end of rotary table section (3021) is corresponding with entering light section (301) and be connected；First rotary table section (3021) it is small
Diameter end is corresponding with one end of cylindrical section (3022) and is connected；The smaller diameter end of second rotary table section (3023) and cylindrical section (3022)
The other end it is corresponding and be connected；The larger diameter end of second rotary table section (3023) with light section (303) are corresponding out and are connected；
Wherein, the middle part and fiber grating (304) that fiber grating (304) is uniformly arranged in glass capillary (4) are scribed at
The reducer of two rotary table sections (3023).
2. a kind of big bandwidth magnetic field sensor based on cone optical-fiber grating according to claim 1, it is characterised in that: hair
The aluminum pipe (8) for preventing magnetic fluid (5) from volatilizing is coaxially arranged on the outside of thin glass tube (4)；The aluminum pipe (8) and entering light section
(301), go out light section (303) closed setting.
3. a kind of big bandwidth magnetic field sensor based on cone optical-fiber grating according to claim 2, it is characterised in that: aluminium
The internal diameter for managing (8) is 0.7-1.0 mm, and outer diameter is 0.9-1.2 mm, and length is 5-6 cm.
4. a kind of big bandwidth magnetic field sensor based on cone optical-fiber grating according to claim 1, it is characterised in that: the
One rotary table section (3021) and second rotary table section (3023) taper ratio having the same, the taper ratio are 0.24-0.4；Fiber grating
(304) length is 2-3 mm.
5. a kind of big bandwidth magnetic field sensor based on cone optical-fiber grating according to claim 1, it is characterised in that: hair
The internal diameter of thin glass tube (4) is 0.3-0.5mm, outer diameter 0.5-0.7mm, length 3-4cm.
6. a kind of a kind of production method of the big bandwidth magnetic field sensor based on cone optical-fiber grating as described in claim 1,
It is characterized by comprising following steps:
A. single mode optical fiber is subjected to fusion drawn by phase mask plate method, then in (3) second rotary table section of cone optical-fiber grating
(3023) reducer inscribes fiber grating (304) by phase mask plate method, finally obtains cone optical-fiber grating (3)；
B. glass capillary (4) are horizontal positioned, the cone optical-fiber grating (3) that step A obtains is coaxially disposed within capillary glass
The middle part of (4) is managed, the assembly of glass capillary (4) and cone optical-fiber grating (3) is formed；
C. the assembly of the glass capillary (4) and cone optical-fiber grating (3) that step B are obtained through capillary action, draws magnetic
Fluid (5) obtains the filling liquid glass tube of both ends open；
D. the filling liquid glass tube horizontal of both ends open obtained in step C is stood into 15-20min, excluded in glass capillary (4)
Air, then, the both ends of glass capillary (4) by the first uv-curable glue envelope (6,7) by the first rotary table section (3021),
Cylindrical section (3022) and the second rotary table section (3023) are sealed in glass capillary (4), are obtained for detecting magnetic field strength
Detector；
Wherein, uv-curable glue (6,7) cured method is by ultraviolet light irradiation 100-150 s；
E. by coaxial arrangement prevents magnetic fluid (5) from volatilizing on the outside of detector obtained in D step shell and the shell passes through the
Two uv-curable glues seal (9,10) sealing.
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| CN201811126527.3A CN109116272B (en) | 2018-09-26 | 2018-09-26 | Large-bandwidth magnetic field sensor based on tapered fiber bragg grating and preparation method |
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| CN201811126527.3A CN109116272B (en) | 2018-09-26 | 2018-09-26 | Large-bandwidth magnetic field sensor based on tapered fiber bragg grating and preparation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709499A (en) * | 2019-01-23 | 2019-05-03 | 西北大学 | A kind of probe-type magnetic field vector sensor and preparation method thereof based on fiber grating |
| CN110836853A (en) * | 2019-12-03 | 2020-02-25 | 河南渡盈光电科技有限公司 | Microfluidic chip, microfluidic test system and microfluidic test method |
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| CN111736001A (en) * | 2020-06-12 | 2020-10-02 | 河南大学 | Novel optical current sensor, system and method based on magnetofluid and grating |
| CN113281685A (en) * | 2021-06-03 | 2021-08-20 | 威海长和光导科技有限公司 | Device and method for measuring magnetic field characteristics by using fiber Bragg grating |
| CN113281685B (en) * | 2021-06-03 | 2022-02-08 | 宏安集团有限公司 | Device and method for measuring magnetic field characteristics by using fiber Bragg grating |
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