CN107843758A - A kind of two die drawings cone fibre optic current sensor and preparation method - Google Patents
A kind of two die drawings cone fibre optic current sensor and preparation method Download PDFInfo
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- CN107843758A CN107843758A CN201710811784.XA CN201710811784A CN107843758A CN 107843758 A CN107843758 A CN 107843758A CN 201710811784 A CN201710811784 A CN 201710811784A CN 107843758 A CN107843758 A CN 107843758A
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- Prior art keywords
- current sensor
- cone
- fibre optic
- optic current
- transition region
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
Abstract
The invention discloses a kind of two die drawings cone fibre optic current sensor and preparation method, fibre optic current sensor includes the first single-mode fiber, First Transition area, cone waist, the second transition region and the second single-mode fiber being sequentially connected；The cone waist and transition region are two mode fibers, and transition region is pyramidal structure；The two mode fibers part is located in glass tube, and is filled with magnetic fluid.The interference strength of the fibre optic current sensor transmission spectrum increases with the increase of externally-applied magnetic field, and the change of optical signal is detected by photodetector, then obtains corresponding curent change by signal transacting, so as to realize the sensing to electric current.The sensitivity of current sensor of the present invention can reach 103.4dB/A, the micro-nano fiber current sensor have the advantages that it is light it is inexpensive, make simple, small volume, be easily operated, had broad application prospects in terms of current sense.
Description
Technical field
The invention belongs to fibre optic current sensor technical field, more particularly to a kind of two die drawings cone fibre optic current sensor and
Preparation method.
Background technology
Electric current is the important parameter of power system, and the accurate measurement to electric current is a very important task, according to survey
The result of amount, the important informations such as metering in the power system, control and relay protection can be obtained, therefore survey tool is proposed
Very high requirement.Measurement to electric current now mainly using the current transformer based on electromagnetic induction principle, it
Principle is simple, and when reliability height, being hardly damaged, but facing super-pressure measurement, conventional current transformer is difficult to adapt to.Current
In the case that the developing rapidly of countries in the world economy increasingly increases the demand of electric power and power transmission capabilities also increased dramatically,
Traditional current sensor based on electromagnetic induction manifests some drawbacks：Insulation, magnetic saturation and electromagnetic interference, dynamic such as be present
Scope is small, is not easy the problems such as transport and mounting assembly complexity.For these problems, there has been proposed many solutions, its
In it is the most effective be to utilize optical fiber sensing technology.In optical communication system, optical fiber is used as long-distance transmissions light wave letter
Number medium, intensity and frequency are relatively stable when light wave transmits in a fiber, and are lost relatively low.Fibre optic current sensor is because profit
By the use of optical fiber as sensing head, so in insulation, electromagnetism interference and reliable and secure etc. having significant advantage.
At present, the fibre optic current sensor of people's research and design mainly has following two：Magnetic field sensing type current sense
Device and block optical-fiber type optical current sensor.Magnetic field sensing type current sensor, is called magnetostrictive effect optical current
Sensor, usually magnetostriction materials are pasted or are plated on single-mode fiber, material its axial dimension under magnetic fields is sent out
Changing so that fiber size produces corresponding minor variations, so as to cause the phase of light in optical fiber to change.Block optical fiber
Type is magneto-optic memory technique type optical current sensor, and it is the Faraday effect using magneto-optic memory technique, under the influence of a magnetic field, is made
The plane of polarization for the linearly polarized light propagated in medium along magnetic direction rotates, so that output intensity changes.Therefore,
As long as measuring the light intensity magnitude of incident outgoing two-beam, the change of magnetic field intensity can be obtained, enters one according to electromagnetic principle knowledge
Step can obtain the size of electric current.Full fiber type current sensor is that Optical Fiber Winding is being tested around electrical conductor, is equally
It is small because electrical conductor produces around in caused magnetic field optical fiber by measurement using the Faraday effect of optical fiber
Faraday rotation angle indirectly measures electric current.
The fibre optic current sensor of above two type is realizing that current sense is theoretically feasible, but sudden and violent in practicality
Some shortcomings are exposed, such as：Optical fiber is not only sensitive to ambient temperature in magnetostrictive effect optical current sensor, and
And it is very sensitive to vibrating, although accomplishing to match as far as possible to two interfere arms, but certain benefit is played to extraneous gradual temperature
The effect of repaying, but the influence vibrated does not have particularly preferred method and eliminated.And Full-optical current sensor exists due to inside of optical fibre
Linear birefrigence, measurement accuracy and long-time stability can be affected.
Foreign countries have scientific research institution to propose, by continuously distorting real core photonic crystal fiber, to make it show pure circle birefringence
Characteristic, so as to realize current sense, referring to Current sensing using circularly
Birefringenttwisted solid-core photonic crystal fiber, Max Planck Institute
For the Science of Light, Guenther-ScharowskyStrasse, 191058Erlangen, Germany.Circle
Shape birefringence is the important indicator for the stability that can resist external disturbance, i.e., the circular polarization state of light is kept by twisted optical fiber.
Because preferable PCF has zero linear birefringence, its current sensitivity is optimal, and the polarization state of output light always line
Property, the anglec of rotation can be measured accurately, become the ideal current sensor based on Faraday effect.This work is good
Solve the problems, such as the fibre optic current sensor stability difference that tradition utilizes Faraday effect, but in the reality of circular brief-ringence torsion
Very big difficulty in the making of core photonic crystal fiber be present, and photonic crystal fiber cost is higher.
The content of the invention
Goal of the invention：For problem above, the present invention proposes a kind of two die drawings cone fibre optic current sensor and preparation method.
Technical scheme：To realize the purpose of the present invention, the technical solution adopted in the present invention is：A kind of fiber-optic current sensor
Device, including the first single-mode fiber, First Transition area, cone waist, the second transition region and the second single-mode fiber being sequentially connected；The cone
Waist and transition region are two mode fibers, and transition region is pyramidal structure；The two mode fibers part is located in glass tube, and is filled with magnetic
Fluid.
A kind of preparation method of fibre optic current sensor, specifically includes following steps：
(1) by the two mode fiber weldings for peelling off coat among single-mode fiber, it is placed on drawing cone machine clamp, makes two moulds
Fiber section is in an intermediate position；
(2) start and draw cone operation program, two mode fibers are partially disposed in hydrogen and heated, while to two side stretchings, formed
Pyramidal structure；
(3) two mode fiber parts are penetrated in glass tube, then magnetic fluid is inserted to the optical fiber week for wherein, being coated on drawing
Enclose.
Beneficial effect：The sensitivity of the current sensor of the present invention can reach 103.4dB/A, the micro-nano fiber current sense
Device have the advantages that it is light it is inexpensive, make simple, small volume, be easily operated, before there is wide application in terms of the current sense
Scape.
Brief description of the drawings
Fig. 1 is fibre optic current sensor schematic diagram of the present invention；
Fig. 2 is non-stretched optical fiber figure compared with drawing and boring two mode fiber spectrum；
Fig. 3 is fibre optic current sensor Experimental equipment of the present invention；
Fig. 4 is spectrogram of the fibre optical sensor when applying different current strength；
Fig. 5 corresponds to the matched curve figure of spectral intensity change when being and applying different current strength.
Embodiment
Technical scheme is further described with reference to the accompanying drawings and examples.
It is two die drawing of the present invention cone fibre optic current sensor as shown in Figure 1, by by one section of two mode fiber welding
Drawing cone is carried out into single-mode fiber, forms new current sensor, considerably increases its transmission spectrum contrast.
The current sensor single mode include be sequentially connected the first single-mode fiber 1, First Transition area 2, cone waist 3, the second mistake
The single-mode fiber 5 of area 4 and second is crossed, it is two mode fibers to bore waist and transition region, and transition region is pyramidal structure, bores waist and transition region is used
Optical fiber draws cone technology to draw two mode fibers and formed.Two mode fiber parts are located in glass tube, and are filled with magnetic fluid, and magnetic fluid is
A kind of liquid magnetisable material, select medium of the magnetic fluid magnetic material as electromagnetic conversion, compared to other magnetic materials
For, liquid has the advantage of uniqueness for reducing the interference such as extraneous vibration.The interference of the fibre optic current sensor transmission spectrum is strong
Degree increases with the increase of externally-applied magnetic field, the change of optical signal is detected by photodetector, then obtain by signal transacting
Corresponding curent change, so as to realize the sensing to electric current.
It is the former optical fiber under non-adiabatic condition due to making micro-nano fiber compared with simple drawing general single mode fiber
Fibre core, cladding size change, a series of high-order mode can be inspired in micro-nano fiber, therefore basic mode and high-order be present
Coupling between mould, so as to cause the generation of interference.
The making of micro-nano fiber draws cone to complete by optical fiber to draw cone machining flame, the major processing steps of fibre optical sensor
It is as follows：
The first step：, will by the common two mode fibers welding for peelling off coat of one section of 2 lis or so length among single-mode fiber
It is placed on drawing cone machine clamp, two mould parts is tried one's best in middle position.
Second step：Cone section length is controlled by controlling hydrogen flowing quantity and draw speed, bores waist diameter and transition region
Shape etc..Hydrogen flowing quantity is used as 160SCCM, the fixture speed of service is 400 μm/s pattern, then starts and cone machine is drawn in computer
Operation program, two moulds are partially disposed under hydrogen flame and heated by machine automatically, while to two side stretchings, form final taper
Structure.
Compared with traditional flame draws cone method single-mode fiber, one section of two mode fiber is added, passes through more non-stretched and drawing
The spectrum of gained micro-nano fiber is stretched, as shown in Fig. 2 it can be found that relative to the former, the present invention can significantly improve transmission spectrum
Interfere contrast, it is met the basic demand as current sensor.
3rd step：Manufactured micro-nano fiber is packaged, micro-nano fiber is penetrated to a diameter of 500 μm of glass tube first
In, then magnetic fluid is inserted wherein, is coated on around the micro-nano fiber of drawing.
It is fibre optic current sensor Experimental equipment as shown in Figure 3, the both ends of glass tube is sealed admittedly with uv-curable glue
Be scheduled on a slide, by the slide for being placed with sample be positioned over field generator for magnetic two it is opposite and to electromagnet in
Between, recorded by changing the size of externally-applied magnetic field, and using Tesla meter, monitor the change of spectrum in real time with spectrometer.
By observing sensor transmission spectrum, it can be found that as the intensity of the increase transmission spectrum of electric current has an entirety to diminish
Trend, especially correspond to small current strength, this variation tendency is particularly evident, as shown in figure 4,15 microns of cone waist diameter
The spectrum that micro-nano fiber sensing head obtains when applying different current strength.It can be reached by current sensitivity maximum corresponding to calculating
To 189.35dB/A, equally occur dip in this course and drifted about towards long wave length direction, can also obtain corresponding sensitive
Spend for 45nm/A, this measurement to low current is very sensitive.And with the increase of current strength, it is corresponding to produce bigger magnetic
So that there is saturated phenomenon in magnetic fluid, and this is determined by the property of magnetic fluid.
It is to follow the trail of the matched curve obtained by its dip as shown in Figure 5, its fitting correlation coefficient R=0.9808, gained electric current is quick
Sensitivity is 103.4dB/A.In the range of curent change is from 0 to 0.18A, the sensitivity of the sensor can reach 103.4dB/A.
The micro-nano fiber current sensor have the advantages that it is light it is inexpensive, make simple, small volume, anti-external interference,
Had broad application prospects in terms of current sense.
Claims (5)
- A kind of 1. fibre optic current sensor, it is characterised in that：Including the first single-mode fiber, First Transition area, the cone being sequentially connected Waist, the second transition region and the second single-mode fiber；The cone waist and transition region are two mode fibers, and transition region is pyramidal structure；It is described Two mode fiber parts are located in glass tube, and are filled with magnetic fluid.
- 2. fibre optic current sensor according to claim 1, it is characterised in that：The cone waist and transition region are drawn with optical fiber Cone technology draws two mode fibers and formed.
- 3. fibre optic current sensor according to claim 1, it is characterised in that：The fibre optic current sensor transmission spectrum Interference strength increases with the increase of externally-applied magnetic field.
- A kind of 4. preparation method of fibre optic current sensor, it is characterised in that：Specifically include following steps：(1) by the two mode fiber weldings for peelling off coat among single-mode fiber, it is placed on drawing cone machine clamp, makes two mode fibers It is partially in centre position；(2) start and draw cone operation program, two mode fibers are partially disposed in hydrogen and heated, while to two side stretchings, form taper Structure；(3) two mode fiber parts are penetrated in glass tube, then magnetic fluid is inserted wherein, is coated on around the optical fiber of drawing.
- 5. the preparation method of fibre optic current sensor according to claim 4, it is characterised in that：In the step (2), lead to Control hydrogen flowing quantity and draw speed are crossed, to control cone section length, cone waist diameter and transition region shape.
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| CN201710811784.XA CN107843758A (en) | 2017-09-11 | 2017-09-11 | A kind of two die drawings cone fibre optic current sensor and preparation method |
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| CN201710811784.XA CN107843758A (en) | 2017-09-11 | 2017-09-11 | A kind of two die drawings cone fibre optic current sensor and preparation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085680A (en) * | 2018-08-14 | 2018-12-25 | 浙江大学 | A kind of packaging method based on the mechanical micro-nano fiber for drawing cone |
| CN109342789A (en) * | 2018-10-18 | 2019-02-15 | 西安电子科技大学 | A kind of all-fiber current sensor and preparation method thereof |
| CN110823808A (en) * | 2019-12-11 | 2020-02-21 | 南昌航空大学 | Tapered side-polished optical fiber biosensor and method for preparing tapered side-polished optical fiber |
| CN112254838A (en) * | 2020-10-10 | 2021-01-22 | 南京邮电大学 | High-sensitivity temperature sensor based on cascade conical two-mode optical fiber structure and testing device |
| CN114089236A (en) * | 2021-12-02 | 2022-02-25 | 邯郸学院 | Optical fiber magnetic field sensor |
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| CN202472036U (en) * | 2012-03-27 | 2012-10-03 | 蚌埠道生精密光电科技有限公司 | Thermosetting system of optical-fiber fusing conical taper with real-time temperature monitoring |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109085680A (en) * | 2018-08-14 | 2018-12-25 | 浙江大学 | A kind of packaging method based on the mechanical micro-nano fiber for drawing cone |
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| CN110823808A (en) * | 2019-12-11 | 2020-02-21 | 南昌航空大学 | Tapered side-polished optical fiber biosensor and method for preparing tapered side-polished optical fiber |
| CN110823808B (en) * | 2019-12-11 | 2023-01-24 | 南昌航空大学 | Tapered side-polished optical fiber biosensor and method for preparing tapered side-polished optical fiber |
| CN112254838A (en) * | 2020-10-10 | 2021-01-22 | 南京邮电大学 | High-sensitivity temperature sensor based on cascade conical two-mode optical fiber structure and testing device |
| CN114089236A (en) * | 2021-12-02 | 2022-02-25 | 邯郸学院 | Optical fiber magnetic field sensor |
| CN114089236B (en) * | 2021-12-02 | 2024-02-02 | 邯郸学院 | Optical fiber magnetic field sensor |
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Application publication date: 20180327 |