CN209707668U - A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber - Google Patents
A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber Download PDFInfo
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- CN209707668U CN209707668U CN201822200556.1U CN201822200556U CN209707668U CN 209707668 U CN209707668 U CN 209707668U CN 201822200556 U CN201822200556 U CN 201822200556U CN 209707668 U CN209707668 U CN 209707668U
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- magnetic field
- optical fiber
- rubbing down
- magnetic
- field sensor
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Abstract
The utility model relates to fibre optic magnetic field sensor technical fields, specifically provide a kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber, including side-polished fiber, the magnetic fluid being coated on around rubbing down area, light source and spectrometer for detecting transmitted spectrum, the rubbing down optical fiber is to fall part of clad by optical fiber rubbing down to be made；The rubbing down optical fiber is equipped with capillary glass tube and optics ultraviolet glue, and the magnetic fluid is by capillary glass tube and optics ultraviolet glue sealed envelope around side-polished fiber；Under magnetic fields, nanoparticle collects or disperses with magnetic direction, so that control of the refractive index of nanoparticle by magnetic field strength and direction, to under the evanscent field interaction between nanoparticle and rubbing down optical fiber, transmitted spectrum signal will receive the control in magnetic field strength and direction, constitute magnetic field sensor.The utility model lies in that the variation in magnetic field strength and direction can be detected delicately, highly sensitive magnetic field measurement is helped to realize.
Description
Technical field
The utility model relates to fibre optic magnetic field sensor technical fields, and in particular to a kind of magnetic fluid coating side throwing optical fiber
Magnetic field sensor and its preparation and detection method.
Background technique
Sensing technology, the communication technology and computer technology have together constituted with three big pillars of modern information industry, exist respectively
Play the role of " sense organ ", " nerve " and " brain " in information system.Wherein, crucial portion of the sensing technology as acquisition of information
Part, is the basis of follow-up transmission, processing, and importance is self-evident.
An important branch of the fibre optical sensor as modern sensor field has small in size, light-weight, sensitivity
It is high, dynamic range is big, it is low in energy consumption, convenient for multiplexing, it is excellent convenient for uniquenesses such as long-range monitoring, strong robustness, anticorrosive, electromagnetism interferences
Point, having traditional sensors under the adverse circumstances such as inflammable and explosive, deep-etching, strong-electromagnetic field can not advantage shoulder to shoulder.It throws side
Polishing method for fiber has become the novel all-fiber devices of construction and Multifunctional optical fiber sensor has become effective way of research and development
One of diameter.This method principle is as follows, and the fibre cladding of adequate thickness ensure that the light field propagated in fibre core, in fibre cladding
The energy of evanescent wave field will not leak into outside of fiber.When reducing the cladding thickness of optical fiber with the method for rubbing down or chemical attack
To region existing for evanescent wave field, that is, away from fibre core only several microns of region when, be formed in a fibre core and transmit light
Evanescent wave field " leakage window ".Herein at " window ", people are possible to be excited using evanscent field, control, detect light
The lossless propagation of transmission light wave in long and slender core or leakage.
And in recent years, using magnetic fluid to magnetic-field-sensitive and the characteristic being easily integrated, fibre optic magnetic field sensor has newly
The implementation for having good development prospect, the fibre optical sensor based on magnetic fluid is also important at sensory field of optic fibre one
Research hotspot.
Utility model content
The purpose of this utility model is to provide a kind of magnetic field sensors of magnetic fluid coating side throwing optical fiber, can delicately examine
Measure the variation in magnetic field strength and direction.
The technical solution that the utility model is taken is as follows:
A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber, including side-polished fiber, be coated on around rubbing down area
Magnetic fluid, light source and the spectrometer for detecting transmitted spectrum, the rubbing down optical fiber is the part for falling optical fiber by rubbing down
Covering is made；The rubbing down optical fiber is equipped with capillary glass tube and optics ultraviolet glue, and the magnetic fluid passes through glass fiber
Tubule and optics ultraviolet glue sealed envelope are around side-polished fiber.
Specifically, the utility model leaks out the light in rubbing down optical fiber in a manner of evanscent field rubbing down, throw
Polishing is fine so as to be interacted with rubbing down area surrounding medium by evanscent field, changes the refraction of rubbing down area surrounding medium
Rate, to change the transmitted spectrum signal of rubbing down optical fiber.Under magnetic fields, when magnetic direction is parallel with optical fiber side throwing face,
Nanoparticle in magnetic fluid collects high density nanometer group on the side throwing surface of optical fiber；When magnetic direction is vertical with optical fiber side throwing face
When, the nanoparticle in magnetic fluid accumulates low-density nanometer group on the side throwing surface of optical fiber.This nanoparticle is with magnetic field side
To the behavior for collecting or dispersing, so that control of the refractive index of nanoparticle by magnetic field strength and direction, and then influence and receive
Evanscent field interaction between rice corpuscles and rubbing down optical fiber, so that the transmitted spectrum signal of rubbing down optical fiber is by magnetic field strength and side
To control, constitute magnetic field sensor.
The utility model using the nanoparticle in magnetic fluid can occur to converge or disperse under magnetic fields so as to cause
The changed characteristic of refractive index recycles the evanscent field of nanoparticle and rubbing down optical fiber to interact, passes through rubbing down optical fiber
Transmitted spectrum reflects the variations in refractive index for the magnetic fluid being coated on rubbing down optical fiber, to realize magnetic field sensing.
Preferably, the distance d of the rubbing down face in rubbing down area to fibre core is 0~2um.
When d is less than 0, illustrates that fibre core will be thrown by part and remove, loss of this time when optical fiber transmits is bigger, transmitted spectrum
In luminous intensity also can accordingly reduce (total numberical range decline), the amplitude of variation of luminous intensity is also accordingly reduced, so that sensing
The sensitivity of device declines.And residual thickness is excessive, fibre cladding can hinder light to leak out in a manner of evanescent wave.
Preferably, the rubbing down section length is 9~15mm.
A kind of preparation method of the magnetic field sensor of magnetic fluid coating side throwing optical fiber: the following steps are included:
S1, it prepares side-polished fiber: by rubbing down, a part of covering of optical fiber being removed, form one in optical fiber surface
The flat site of measured length, i.e. rubbing down area；
S2, by capillary pipe sleeve outside the rubbing down area of side throwing optical fiber, magnetic fluid is filled in capillary using capillarity,
To make magnetic fluid be coated on around optical fiber, purple light glue is dripped at capillary both ends, with ultraviolet light irradiation until purple light glue is completely solidifying
Gu capillary both ends are sealed.
Preferably, rubbing down is carried out to optical fiber using emery wheel in step sl, the granularity of the abrasive grains on emery wheel is less than 1
μm。
Preferably, a kind of detection method of the magnetic field sensor using above-mentioned magnetic fluid coating side throwing optical fiber detects magnetic field
When direction change, the magnetic field strength in magnetic field is detected between 0~300Oe.This detection method is to detect the light intensity of transmitted spectrum
Degree changes the variation to determine magnetic field strength or direction.
Preferably, the detection range of the transmitted spectrum of spectrometer is in 400~1100nm.
Preferably, spectrometer acquires the luminous intensity on corresponding wavelength every 1nm, finally by the light on all wavelengths
Intensity is summed to obtain final luminous intensity.
Compared with prior art, the utility model has the beneficial effects that
(1) the utility model utilizes the magneto-optic of nanoparticle in magnetic fluid by combining rubbing down optical fiber with magnetic fluid
The non-centrosymmetric structure of non-homogeneous aggregation properties around optical fiber of effect, magnetic fluid, side throwing optical fiber itself, magnetic fluid with
Under the evanscent field interaction of rubbing down optical fiber, realizes that magnetic field controls the high sensitivity of transmitted spectrum signal, transmitted light can be passed through
Spectrum signal reflects the variation in magnetic field strength and direction.
(2) excellent experimental data is searched out in the utility model according to many experiments, can effectively be avoided due to preparing work
Optical power loss brought by the fault of skill causes the sensitivity of sensor to decline.
(3) the magnetic field strength section in suitable detected magnetic field is selected, so that the magnetic field angle response characteristic of sensor
High sensitivity is easy to measure the variation of magnetic direction.
Detailed description of the invention
Fig. 1 is in embodiment 1, and fixed magnetic field intensity is 300Oe, rubbing down area and magnetic field the angled light from 0 ° to 90 °
Response characteristic figure.
Fig. 2 is in embodiment 1, and fixed magnetic field intensity is 300Oe, rubbing down area and magnetic field it is angled from 90 ° to 180 °
Response characteristics to light figure.
Fig. 3 is in embodiment 1, and fixed magnetic field intensity is 300Oe, rubbing down area and magnetic field it is angled from 180 ° to 270 °
Response characteristics to light figure.
Fig. 4 is in embodiment 1, and fixed magnetic field intensity is 300Oe, rubbing down area and magnetic field it is angled from 270 ° to 360 °
Response characteristics to light figure.
Fig. 5 is the sensing device and measurement method schematic diagram in the utility model.
Fig. 6 is in embodiment 1, when fixed magnetic field intensity is respectively 60Oe and 300Oe, the Output optical power that measures with
The response results of magnetic field angle.
Fig. 7 is in embodiment 2, and when fixed magnetic field angle is respectively 0 ° and 90 °, the Output optical power measured is with magnetic field
The response results of intensity.
Specific embodiment
The utility model attached drawing only for illustration, should not be understood as limiting the present invention.In order to more preferable
Illustrate following embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；For this
For the technical staff of field, the omitting of some known structures and their instructions in the attached drawings are understandable.
Embodiment 1
A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber, including side-polished fiber, be coated on around rubbing down area
Magnetic fluid, light source and the spectrometer for detecting transmitted spectrum, the rubbing down optical fiber is the part for falling optical fiber by rubbing down
Covering is made, and makes the light in rubbing down optical fiber can leak out in a manner of evanescent wave rubbing down, rubbing down optical fiber to
It can be interacted in the form of evanscent field with the medium in rubbing down area, by changing the refractive index of substance in rubbing down area, from
And change the transmitted spectrum signal of rubbing down optical fiber.
The magnetic fluid is by capillary glass tube and optics ultraviolet glue sealed envelope around side-polished fiber；In magnetic
Under field action, when magnetic direction is parallel with optical fiber side throwing face, the nanoparticle in magnetic fluid collects above optical fiber side throwing face
At high density nanometer group, when magnetic direction is vertical with optical fiber side throwing face, the nanoparticle in magnetic fluid is on optical fiber side throwing face
Low-density nanometer group is accumulated in square region, nanoparticle collects or disperses with magnetic direction, so that the refractive index of nanoparticle
By the control of magnetic field strength and direction, thus under the evanscent field between nanoparticle and rubbing down optical fiber interacts, so that
The transmitted spectrum signal of rubbing down optical fiber is constituted magnetic field sensor by the control of magnetic field strength and direction.
Preferably, the residual thickness d of the rubbing down face in rubbing down area to fibre core is 0 μm.
Preferably, the rubbing down section length is 10mm.
A kind of preparation method of the magnetic field sensor of magnetic fluid coating side throwing optical fiber: the following steps are included:
S1, it prepares side-polished fiber: by rubbing down, a part of covering of optical fiber being removed, form one in optical fiber surface
The flat site of measured length, i.e. rubbing down area；
S2, by capillary pipe sleeve outside the rubbing down region of side throwing optical fiber, magnetic fluid is filled with capillary using capillarity
In, so that magnetic fluid be made to be coated on around optical fiber, purple light glue is dripped at capillary both ends, with ultraviolet light irradiation until purple light glue is complete
Solidification, capillary both ends are sealed.
Preferably, a kind of detection method of the magnetic field sensor using above-mentioned magnetic fluid coating side throwing optical fiber detects magnetic field
When direction change, the magnetic field strength in magnetic field is detected between 0~300Oe.
Preferably, the detection range of the transmitted spectrum of spectrometer is in 400~1100nm.
Preferably, spectrometer acquires the luminous intensity on corresponding wavelength every 1nm, finally by the light on all wavelengths
Intensity is summed to obtain final luminous intensity.
For the characteristic that the magnetic field sensor of the magnetic fluid coating side throwing optical fiber responds magnetic direction, applicant is carried out
Following experiment:
Herein using the experimental method of control variable, electromagnet both end voltage is adjusted to certain value, guarantees magnetic field strength
It is stable and constant, magnetic field sensor magnetic field angle response characteristic is then tested by rotating field sensor.Every rotation is certain
Angle just observes and records the spectrum under lower current angular.Fig. 1 to Fig. 4 (response when lowermost curve is 0 ° in Fig. 1
Characteristic curve, 4 ° are taken second place, as the height of the corresponding curve of increase of angle is sequentially increased) it is that control magnetic field strength is
300Oe is constant, and current spectrogram is recorded in every 4 ° of rotation, from 0 ° record always to 360 ° (as shown in figure 5, at 0 °, magnetic field
It is tangent with rubbing down area, magnetic field face rubbing down area at 90 °).From Fig. 1~4 it is not difficult to find out that, from 0 ° to 90 °, as angle gradually increases
Add, the trend risen is totally presented in the luminous intensity of the light of each wavelength；From 90 ° to 180 °, as angle gradually increases, each wavelength
Downward trend is totally presented in the luminous intensity of light；From 180 ° to 270 °, as angle gradually increases, the luminous intensity of the light of each wavelength
It is overall that the trend risen is presented；And from 270 ° to 360 °, as angle gradually increases, the luminous intensity of the light of each wavelength is totally presented
Again be downward trend.And, it is apparent that when angle is from when changing for 0 ° or 180 °, accordingly from Fig. 1~4
Intensity variation is relatively large, it was demonstrated that sensor is maximum to 0 ° and 180 ° of direction and sensitivity.
In order to probe into influence of the magnetic field strength for the direction and sensitivity of sensor, applicant tests magnetic field strength 60Oe
When magnetic field sensor magnetic field angle performance, and by 60Oe under 300Oe magnetic field angle response interpretation together with
It is compared, as shown in Figure 6.In fig. 6 it can be seen that when magnetic field strength is in 300Oe, the intensity variation of transmitted spectrum with
Angle change becomes apparent, and is in 8 fonts, and magnetic field strength is in 60Oe, and the intensity variation of transmitted spectrum is with angle change phase
To subtle, this proves that magnetic field strength is higher, and magnetic field angle response characteristic is most sensitive, can preferably analyze the change of magnetic field angle
Change.
Embodiment 2
The characteristic that the present embodiment responds magnetic field strength for the magnetic field sensor of the magnetic fluid coating side throwing optical fiber, Shen
It asks someone to have carried out following experiment:
After sensor to be fixed on to specified magnetic field angle, changes the intensity in magnetic field by changing supply voltage, often change
Become the spectrogram under a primary voltage current magnetic field intensity of record, magnetic field strength of this experiment changes range and arrives for 0Oe
400Oe, it is 0 ° and 90 ° that rubbing down area is angled with magnetic field institute, obtains Fig. 7.As shown in fig. 7, when angle is 0 °, with magnetic field strength
Increase, entire lowering trend is presented in the luminous intensity of the light of each wavelength, and when angle is 90 °, with the increase of magnetic field strength, respectively
The luminous intensity presentation of the light of wavelength rises overally trend, illustrates when the field parallel of incident light is when externally-applied magnetic field direction, magnetic current
The refractive index of body increases with magnetic field strength and is increased；When the electric field of incident light is perpendicular to externally-applied magnetic field direction, the folding of magnetic fluid
Rate is penetrated to increase with magnetic field strength and reduce, therefore, with the increase of magnetic field strength, rubbing down area and the angled variation in magnetic field and
The amplitude of variation of caused luminous intensity is bigger, is conducive to the sensitivity for improving the magnetic field angle response characteristic of sensor, more acurrate
The variation for measuring magnetic field.And from Fig. 7 it can be found that the luminous intensity of transmitted spectrum is therewith when the increase with magnetic field strength
It increases or decreases, when magnetic field strength reaches 300Oe, magnetic field strength is continued growing, the variation of the luminous intensity of transmitted spectrum
It tends towards stability.For this purpose, the utility model is in order to avoid magnetic field strength mistake while improving the sensitivity of magnetic field angle response characteristic
Energy consumption and other problems brought by height have been concluded in magnetic direction measurement, and the magnetic field strength range for being detected magnetic field is answered
It should be between 0~300 Oe.
Specifically, to magnetic field direction or intensity detect when, be first recorded under different magnetic field intensity, rubbing down area
Magnetic field angle response curve of the angle from 0 ° to 360 ° between magnetic field, then when external magnetic field changes, according to light intensity
The amplitude that degree increases or decreases and changes finds corresponding curve, realizes the measurement to magnetic direction and intensity.
Obviously, the above embodiments of the present invention is only intended to clearly illustrate made by technical solutions of the utility model
Citing, and it is not the restriction to specific embodiment of the present utility model.All spirit in the utility model claims book
With any modifications, equivalent replacements, and improvements made within principle etc., the protection of the utility model claims should be included in
Within the scope of.
Claims (3)
1. a kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber, which is characterized in that including side-polished fiber, be coated on throwing
Magnetic fluid, light source and the spectrometer for detecting transmitted spectrum around area are ground, the rubbing down optical fiber is by optical fiber rubbing down
Fall part of clad to be made；
The rubbing down optical fiber is equipped with capillary glass tube and optics ultraviolet glue, and the magnetic fluid passes through capillary glass tube and light
Ultraviolet glue sealed envelope is learned around side-polished fiber.
2. a kind of magnetic field sensor according to claim 1, which is characterized in that the distance in the rubbing down face in rubbing down area to fibre core
D is 0~2um.
3. a kind of magnetic field sensor according to claim 2, which is characterized in that the rubbing down section length is 9~15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201822200556.1U CN209707668U (en) | 2018-12-26 | 2018-12-26 | A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822200556.1U CN209707668U (en) | 2018-12-26 | 2018-12-26 | A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber |
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| CN209707668U true CN209707668U (en) | 2019-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683112A (en) * | 2018-12-26 | 2019-04-26 | 暨南大学 | A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber and its preparation and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683112A (en) * | 2018-12-26 | 2019-04-26 | 暨南大学 | A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber and its preparation and detection method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |