CN206684285U - A kind of magnetic field sensor based on shaddock type optical fiber and bragg grating - Google Patents
A kind of magnetic field sensor based on shaddock type optical fiber and bragg grating Download PDFInfo
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- CN206684285U CN206684285U CN201720382759.XU CN201720382759U CN206684285U CN 206684285 U CN206684285 U CN 206684285U CN 201720382759 U CN201720382759 U CN 201720382759U CN 206684285 U CN206684285 U CN 206684285U
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- optical fiber
- type optical
- bragg grating
- magnetic field
- shaddock type
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Abstract
The utility model discloses a kind of magnetic field sensor based on shaddock type optical fiber and bragg grating, it is made up of light source 1, optical fiber circulator 2, sensing head 3, spectrometer 4 and bragg grating 5, shaddock type optical fiber 6, magnetic fluid 7, magnetic fluid 7 is filled with the airport of shaddock type optical fiber 6, fibre core is carved with bragg grating 5, left end connects optical fiber circulator 2, and right-hand member is sealed with ultraviolet glue.When external magnetic field Strength Changes, magnetic fluid refractive index in shaddock type optical fiber airport changes, drifted about so as to the resonance peak of bragg grating, the real-time sensing to extraneous magnetic field intensity can be realized to obtain the size of external magnetic field intensity by measuring resonance peak wavelength shift.The utility model is simple in construction, and cost is low, and high sensitivity is easy to use.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, more particularly to one kind is based on shaddock type optical fiber and bragg fiber
The magnetic field sensor of grating.
Background technology
The space structure of photonic crystal fiber (Photonic Crystal Fiber, PCF) is more flexible, guide-lighting mechanism compared with
For uniqueness, there is relatively low dispersion, airport loss and unique endless single mode characteristic.Cloth processed is write in photonic crystal fiber
Glug fiber grating has some unique properties compared with common Fiber Bragg Grating FBG.Shaddock type optical fiber is a kind of big
The photonic crystal fiber of air pore structure, there are 6 symmetrical shaddock type airports in covering.System is write in shaddock type optical fiber
Bragg grating, different special liquids is filled in airport, measurement temperature, magnetic field and electric field etc. can be fabricated to
Different sensors.
Magnetic fluid is magnetic particle (such as CoFe of nano-scale2O4、MnFe2O4、Fe3O4Deng) disperse is in non magnetic solvent
The stable colloid system formed in (such as water, kerosene, heptane), be it is a kind of have have controllable rheology special with applied field strengths
The special novel nano-material of property.It is anti-that fibre optic magnetic field/current sensor has classical magnetic field/current sensor not have
Electromagnetic interference, dynamic efficient working range are big, bandwidth, essential safety, the influence for adapting to adverse circumstances, will not produce magnetic core
The advantages of saturated phenomenon.Elastic suspended is pasted onto using thermal tuning of the electric current to the centre wavelength of fiber grating, or by fiber grating
On arm beam or giant magnetostrictive material, and electric current and magnetic field sensing are realized using different temperature-compensating modes, obtained at present
Positive achievement in research.But the probe size of these sensors is big, conversion efficiency is low, sensitivity and precision are affected.
The content of the invention
In order to solve above-mentioned the deficiencies in the prior art, the purpose of this utility model is that providing one kind is based on shaddock type optical fiber
With the magnetic field sensor of bragg grating, the sensor has the advantages that high sensitivity, cost is low, and practicality is high.
Technical scheme is used by the utility model：A kind of magnetic field based on shaddock type optical fiber and bragg grating
Sensor, including light source (1), optical fiber circulator (2), sensing head (3), spectrometer (4), bragg grating (5), shaddock type
Optical fiber (6) and magnetic fluid (7).The output end of light source (1) is connected with a ports of optical fiber circulator (2), the b of optical fiber circulator (2)
Port is connected with the left end of sensing head (3), and the c ports of optical fiber circulator (2) are connected with the input of spectrometer (4)；Its feature
It is, described sensing head (3) is made up of bragg grating (5), shaddock type optical fiber (6) and magnetic fluid (7), left end connection
Optical fiber circulator (2), right-hand member is sealed with ultraviolet glue, and magnetic fluid (7) is filled with the airport of shaddock type optical fiber (6), and fibre core is carved
There is bragg grating (5).
Described light source (1) is wideband light source, wave-length coverage 1500nm-1700nm.
The grid region length of described bragg grating (5) is 12mm, and the wavelength of four resonance peaks is followed successively by
1551.304nm, 1558.384nm, 1562.152nm, 1565.940nm, resonance peak corresponding to wavelength 1565.940nm meet fine
The Bragg condition of core coupling, is the principal reflection peak of grating, and depth has reached 21dB.
Have 6 symmetrical shaddock type airports in the covering of described shaddock type optical fiber (6), two-by-two between wall thickness 1.82
μm, pitch of holes is 21.7 ± 1.5 μm, and core diameter is 11.2 ± 1.0 μm, fiber core refractive index 1.479, cladding diameter 125
± 5 μm, cladding index 1.457, the shaddock type optical fiber fabrication that sensing head (3) is grown with 20mm.
Described magnetic fluid (7) is a kind of stability magnetic liquid using water as matrix, diameter of nano particles 10nm, close
Spend for 1.8g/cc, saturation magnetization 220Gauss.
Operation principle of the present utility model is：Magnetic fluid is filled in 6 airports of shaddock type optical fiber, is taken out with low pressure
Enter method and magnetic fluid is moved to grid region position, because magnetic fluid has very strong absorption characteristic, cladding mode is absorbed, now in light
Principal reflection peak is can only see on spectrometer, remaining three peaks disappear.When external magnetic field intensity changes, magnetic fluid refractive index hair
It is raw to change, drifted about so as to the reflection peak of bragg grating, by measuring the drift value of reflection peak, magnetic field can be obtained
The change of intensity.
The beneficial effects of the utility model are：Fibre optical sensor has the advantages of electromagnetism interference, it is ensured that the standard of measurement
Standby property, and magnetic fluid is embedded in the airport of shaddock type optical fiber, and compared to relatively overcoating magnetic fluid, the change of refractive index is to Prague
Fiber grating has a great influence, so adding the sensitivity of the magnetic field sensor to a certain extent.
Brief description of the drawings
Fig. 1 is of the present utility model a kind of based on the magnetic field sensor feature of shaddock type optical fiber and bragg grating dress
Put schematic diagram.
Fig. 2 is the sectional view of shaddock type optical fiber of the present utility model
Embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Referring to accompanying drawing 1, a kind of magnetic field sensor based on shaddock type optical fiber and bragg grating, it is characterised in that：
By light source (1), optical fiber circulator (2), sensing head (3), spectrometer (4), bragg grating (5), shaddock type optical fiber (6) and
Magnetic fluid (7) forms.The output end of light source (1) is connected with a ports of optical fiber circulator (2), the b ports of optical fiber circulator (2)
It is connected with the left end of sensing head (3), the c ports of optical fiber circulator (2) are connected with the input of spectrometer (4)；Characterized in that,
Described sensing head (3) is made up of bragg grating (5), shaddock type optical fiber (6) and magnetic fluid (7), left end connection optical fiber
Circulator (2), right-hand member is sealed with ultraviolet glue, magnetic fluid (7) is filled with the airport of shaddock type optical fiber (6), fibre core is carved with cloth
Glug fiber grating (5).
A kind of magnetic field sensor based on shaddock type optical fiber and bragg grating, its working method are：Light source (1) is sent out
The light gone out by a port transmissions of optical fiber circulator (2) to optical fiber circulator (2), then b ports by optical fiber circulator (2)
Sensing head (3) is transferred to, for light when by bragg grating, the light of specific wavelength is coupled to the core mode of reverse transfer
In, this part light exports from sensing head (3) left end, and light is again by the b port transmissions of optical fiber circulator (2) to optical fiber circulator
(2), pass through the c port transmissions of optical fiber circulator (2) after light to spectrometer (5), obtain real-time spectrogram.Work as external magnetic field
Intensity changes, and magnetic fluid (7) refractive index being embedded in shaddock type optical fiber (6) airport changes, so as to Prague
The resonance peak of fiber grating (8) drifts about, can be to obtain external magnetic field intensity by measuring resonance peak wavelength shift
Size, realize the real-time sensing to extraneous magnetic field intensity.
Claims (4)
- A kind of 1. magnetic field sensor based on shaddock type optical fiber and bragg grating, it is characterised in that：By light source (1), light Fine circulator (2), sensing head (3), spectrometer (4), bragg grating (5), shaddock type optical fiber (6) and magnetic fluid (7) group Into the output end of light source (1) is connected with a ports of optical fiber circulator (2), b ports and the sensing head (3) of optical fiber circulator (2) Left end connection, the c ports of optical fiber circulator (2) are connected with the input of spectrometer (4)；Characterized in that, described sensing Head (3) is made up of bragg grating (5), shaddock type optical fiber (6) and magnetic fluid (7), left end connection optical fiber circulator (2), Right-hand member is sealed with ultraviolet glue, and magnetic fluid (7) is filled with the airport of shaddock type optical fiber (6), and fibre core is carved with bragg fiber light Grid (5).
- 2. a kind of magnetic field sensor based on shaddock type optical fiber and bragg grating according to claim 1, it is special Sign is：The grid region length of described bragg grating (5) is 12mm, and the wavelength of four resonance peaks is followed successively by 1551.304nm, 1558.384nm, 1562.152nm, 1565.940nm, resonance peak corresponding to wavelength 1565.940nm meet fine The Bragg condition of core coupling, is the principal reflection peak of grating, and depth has reached 21dB.
- 3. a kind of magnetic field sensor based on shaddock type optical fiber and bragg grating according to claim 1, it is special Sign is：Have 6 symmetrical shaddock type airports in the covering of described shaddock type optical fiber (6), two-by-two between the μ of wall thickness 1.82 M, pitch of holes be 21.7 ± 1.5 μm, core diameter be 11.2 ± 1.0 μm, fiber core refractive index 1.479, cladding diameter be 125 ± 5 μm, cladding index 1.457, the shaddock type optical fiber fabrication that sensing head (3) is grown with 20mm.
- 4. a kind of magnetic field sensor based on shaddock type optical fiber and bragg grating according to claim 1, it is special Sign is：Described magnetic fluid (7) is a kind of stability magnetic liquid using water as matrix, diameter of nano particles 10nm, close Spend for 1.8g/cc, saturation magnetization 220Gauss.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720382759.XU CN206684285U (en) | 2017-04-12 | 2017-04-12 | A kind of magnetic field sensor based on shaddock type optical fiber and bragg grating |
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| CN201720382759.XU CN206684285U (en) | 2017-04-12 | 2017-04-12 | A kind of magnetic field sensor based on shaddock type optical fiber and bragg grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064827A (en) * | 2017-04-12 | 2017-08-18 | 中国计量大学 | A kind of magnetic field sensor based on shaddock type optical fiber and bragg grating |
| CN111121963A (en) * | 2020-01-12 | 2020-05-08 | 哈尔滨理工大学 | Rod-shaped ZnO/graphene single-sphere micro-nano structure ultraviolet sensor and manufacturing method thereof |
-
2017
- 2017-04-12 CN CN201720382759.XU patent/CN206684285U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064827A (en) * | 2017-04-12 | 2017-08-18 | 中国计量大学 | A kind of magnetic field sensor based on shaddock type optical fiber and bragg grating |
| CN111121963A (en) * | 2020-01-12 | 2020-05-08 | 哈尔滨理工大学 | Rod-shaped ZnO/graphene single-sphere micro-nano structure ultraviolet sensor and manufacturing method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171128 Termination date: 20180412 |