CN103823125A - Fine-core optical core and magnetic fluid-based electric field sensor - Google Patents
Fine-core optical core and magnetic fluid-based electric field sensor Download PDFInfo
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- CN103823125A CN103823125A CN201410083909.8A CN201410083909A CN103823125A CN 103823125 A CN103823125 A CN 103823125A CN 201410083909 A CN201410083909 A CN 201410083909A CN 103823125 A CN103823125 A CN 103823125A
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Abstract
The invention discloses a fine-core optical core and magnetic fluid-based electric field sensor which comprises a super-continuous light source, an input single mode fiber, an output single mode fiber, a fine-core optical core, magnetic fluid, a quartz capillary tube and a spectrum analyzer. The super-continuous light source is connected with the fine-core optical core through the input single mode fiber; the other end of the fine-core optical core is connected to the spectrum analyzer through the output single mode fiber; the fine-core optical core immersed in the magnetic fluid is put into a tested electric field environment. The refractive index of the magnetic fluid is correspondingly changed along with the electric field, namely an effective refractive index of the cladding is changed, so that phase difference change between a cladding mode and a core mode of the fine-core optical core is caused, and the interference spectrum wavelength shift is output. The output interference spectrum is shifted along with the change of the electric field, and electric-field measurement can be realized by demodulating the shift of the interference spectrum. The electric field sensor provided in the invention has the advantages that the manufacturing process is simple, and additionally the electric field sensor serves as an all fiber structure and has the advantages of low insertion loss, low cost and high sensitivity.
Description
Technical field
The invention belongs to optical fiber technology field, particularly relate to a kind of tunable refractive index characteristic of magnetic fluid that utilizes as the electric-field sensor based on thin-core fibers MZ interferometer of electric field induction material.
Background technology
Electric field is the fundamental physical quantity that characterizes nature electromagnet phenomenon, and electric field measurement is the important fundamental research means of numerous scientific researches and field of engineering technology.Along with the development of power industry, the measurement of electric field is causing that researchist more and more pays close attention to.For example, in power industry, electric field measurement can be used for POWER SYSTEM STATE monitoring, the measurement of electrical equipment inner electric field and outer electric field distribution situation and the research of corona discharge phenomenon etc.; Aspect electromagnetic compatibility, in research, electric field measurement can be used for external electromagnetic radiation and the interference of detected electrons instrument, and the impact of research environment electric field on electronic device operation conditions etc.This external petroleum chemical industry and relate to inflammable gas, steam and industry that dust generates in, safety monitoring also needs electric field measurement.In actual applications, there is the problem that external environment is very serious to the interference of electric-field sensor, especially very large on the transmission result impact of signal, be therefore necessary to adopt suitable method to go to weaken the interference to measuring.
At present traditional electric-field sensor generally all exist volume large, affect the defect problems such as Electric Field Distribution to be measured, poor anti jamming capability.And compared with traditional electric-field sensor, electric field sensor of optic fibre, as a kind of novel sensor, has unrivaled superiority, is applicable to being very much applied to complex environment, can weaken in complex environment other factors simultaneously to the interference of measuring.It has that volume is little, quality is light, anti-interference strong, highly sensitive, corrosion-resistant, fast response time, can be used for the advantages such as the measurement of high-frequency electric field.And the fibre optic interferometer electric-field sensor of non-grating type, because manufacture craft is simple, low cost and higher temperature stability, attracted increasing scholar especially, becomes the focus of current academia research.This class electric-field sensor design philosophy is a fiber mode interference sensor of structure, excite thus the high-order cladding mode of transmission light, these high-order cladding modes are subject to the impact of external electrical field, make to there is stable optical path difference between high-order cladding mode and core mode and also finally interfere, thereby form the sensor of electric field-sensitive to external world.But all there is the shortcomings such as complex manufacturing technology, starting material are special, physical strength is lower in existing optical-fiber type mode interferometer.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, propose that technique is simple, low cost, the little and highly sensitive electric-field sensor based on thin-core fibers and magnetic fluid of insertion loss, it can realize the size detection to environment of electric field in around.
Technical scheme of the present invention:
Based on an electric-field sensor for thin-core fibers and magnetic fluid, comprise Supercontinuum source, input single-mode fiber, output single-mode fiber, thin-core fibers, magnetic fluid, quartz capillary, spectroanalysis instrument.Described Supercontinuum source is connected with thin-core fibers by input single-mode fiber, and the other end of thin-core fibers is connected on spectroanalysis instrument by output single-mode fiber; Thin-core fibers is placed in quartz capillary and immerses magnetic fluid, and thin-core fibers is immersed in magnetic fluid completely, light chemosetting glue sealing for the two ends of quartz capillary.
The two ends of described thin-core fibers are all and single-mode fiber welding without acceptance of persons, and described quartz capillary diameter is 300 μ m.
Described thin-core fibers core diameter is 3 μ m, and cladding diameter is 125 μ m, and length is 1-2cm;
The described thin-core fibers that is immersed in magnetic fluid is put into tested electric field environment.
The principle of work of the electric-field sensor based on thin-core fibers and magnetic fluid that the present invention makes:
Incident light is with the transmission of basic mode form in single-mode fiber, and luminous energy concentrates in fibre core.When arriving the fusion point of input single-mode fiber and thin-core fibers, because fibre core varies in size, a part of basic mode can be excited in the covering of thin-core fibers, as cladding mode, and transmission forward together with basic mode in thin core fibre core.In the time arriving thin-core fibers and export the fusion point of single-mode fiber, while transmission in optical fiber due to different high-order cladding modes, effective refractive index is different, and the light that a part is excited will be coupled in fibre core again, and interferes with the basic mode in fibre core.Magnetic field is provided by electric field, and the refractive index of magnetic fluid can regulate by the electric field in environment.In the time that thin-core fibers surrounding environment electric field changes, the refractive index of magnetic fluid changes with regard to corresponding, be that thin-core fibers structure cladding-effective-index changes, thereby cause that between thin-core fibers cladding mode and core mode, phase differential changes, cause exporting interference spectrum wave length shift.Output interference spectrum can drift about along with the variation of electric field, just can realize electric field measurement by demodulated interferential spectral drift.
Advantage of the present invention and beneficial effect:
It is simple that electric field measurement sensor provided by the invention has manufacture craft, needs grating to write system processed unlike fiber-optic grating sensor, and it only needs heat sealing machine, general single mode fiber and thin-core fibers.The present invention, as all optical fibre structure, has, the advantage such as cost low, high sensitivity low to insertion loss in addition.
Accompanying drawing explanation
Fig. 1 is the electric-field sensor structural representation based on thin-core fibers and magnetic fluid in the present invention;
In figure: 1. Supercontinuum source, 2. input single-mode fiber, 3. thin-core fibers, 4. output single-mode fiber, 5. spectroanalysis instrument, 6. magnetic fluid, 7. optics solidifies glue, 8. quartz capillary.
For objects and advantages of the present invention are described better, below in conjunction with accompanying drawing and example, the invention will be further described.
Embodiment
Embodiment 1
As shown in Figure 1, the electric-field sensor based on thin-core fibers and magnetic fluid provided by the invention, comprises Supercontinuum source 1, input single-mode fiber 2, thin-core fibers 3, output single-mode fiber 4, magnetic fluid 6, quartz capillary 8, spectroanalysis instrument 5.Described Supercontinuum source 1 is connected with thin-core fibers 3 by input single-mode fiber 2, and the other end of thin-core fibers 3 is connected on spectroanalysis instrument 5 by output single-mode fiber 4.The two ends of described thin-core fibers 3 are all and single-mode fiber welding without acceptance of persons, and thin-core fibers 3 is placed in the quartz capillary 8 that diameter is 300 μ m and immerses magnetic fluid 6, thin-core fibers 3 is immersed in magnetic fluid 6 completely, and the two ends of quartz capillary 8 seal with light chemosetting glue 7.The described thin-core fibers that is immersed in magnetic fluid 63 is put into tested electric field environment.
Incident light is with the transmission of basic mode form in input single-mode fiber 2, and luminous energy concentrates in fibre core.When arriving the fusion point of input single-mode fiber 2 with thin-core fibers 3, because fibre core varies in size, a part of basic mode can be excited in the covering of thin-core fibers 3, as cladding mode, and transmission forward together with basic mode in thin core fibre core 3.When arriving the fusion point of thin-core fibers 3 with output single-mode fiber 4, while transmission in optical fiber due to different high-order cladding modes, effective refractive index is different, and the light that a part is excited will be coupled in fiber core again, and interferes with the basic mode in fibre core.Magnetic field is provided by electric field, and the refractive index of magnetic fluid 6 can regulate by the electric field in environment.In the time that thin-core fibers 3 surrounding environment electric fields change, the refractive index of magnetic fluid 6 changes with regard to corresponding, be that thin-core fibers 3 structure cladding-effective-indexs change, thereby cause that between thin-core fibers cladding mode and core mode, phase differential changes, cause exporting interference spectrum wave length shift.Output interference spectrum can drift about along with the variation of electric field, is floated and can be realized electric field measurement by demodulated interferential spectrum.
Claims (4)
1. the electric-field sensor based on thin-core fibers and magnetic fluid, is characterized in that: this sensor comprises Supercontinuum source, input single-mode fiber, output single-mode fiber, thin-core fibers, magnetic fluid, quartz capillary, spectroanalysis instrument; Described Supercontinuum source is connected with thin-core fibers by input single-mode fiber, and the other end of thin-core fibers is connected on spectroanalysis instrument by output single-mode fiber; Thin-core fibers is placed in quartz capillary and immerses magnetic fluid, and thin-core fibers is immersed in magnetic fluid completely, light chemosetting glue sealing for the two ends of quartz capillary.
2. electric-field sensor according to claim 1, is characterized in that: the two ends of described thin-core fibers are all and single-mode fiber welding without acceptance of persons that described quartz capillary diameter is 300 μ m.
3. electric-field sensor according to claim 1, is characterized in that: the core diameter of described thin-core fibers is 3 μ m, and cladding diameter is 125 μ m, and length is 1-2cm.
4. electric-field sensor according to claim 1, is characterized in that: the described thin-core fibers that is immersed in magnetic fluid is put into tested electric field environment.
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| CN201410083909.8A CN103823125A (en) | 2014-03-10 | 2014-03-10 | Fine-core optical core and magnetic fluid-based electric field sensor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280900A (en) * | 2014-09-30 | 2015-01-14 | 浙江大学 | Electric field sensing element with all-fiber structure and electric field sensing device |
| CN105259117A (en) * | 2015-08-14 | 2016-01-20 | 江苏双仪光学器材有限公司 | Mode interference-based fine core cascaded optical fiber biosensor |
| CN106500740A (en) * | 2016-10-21 | 2017-03-15 | 天津理工大学 | A kind of Radix Triplostegiae Grandiflorae component opitical fiber sensor based on magnetic field and temperature and preparation method thereof |
| CN106596452A (en) * | 2016-12-30 | 2017-04-26 | 重庆理工大学 | Hydrogen sulfide gas sensor and manufacturing method thereof and hydrogen sulfide concentration detection method |
| CN106896277A (en) * | 2017-04-27 | 2017-06-27 | 北京航空航天大学 | A kind of electric-field sensor based on micro-nano optical fiber evanescent field and electro-optic polymer |
| CN110579726A (en) * | 2019-10-15 | 2019-12-17 | 哈尔滨理工大学 | Spr-based high-sensitivity magnetic field sensing device |
| CN111175987A (en) * | 2018-11-09 | 2020-05-19 | 青岛海信激光显示股份有限公司 | Laser spot dissipation device, laser spot dissipation method and laser projection equipment |
| CN112881952A (en) * | 2020-12-28 | 2021-06-01 | 国网江西省电力有限公司信息通信分公司 | Magnetic field sensor and preparation method thereof |
| CN110398620B (en) * | 2019-06-11 | 2024-03-15 | 南京邮电大学 | Capillary microcavity current sensor based on protein liquid core whispering gallery mode resonance |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280900A (en) * | 2014-09-30 | 2015-01-14 | 浙江大学 | Electric field sensing element with all-fiber structure and electric field sensing device |
| CN105259117A (en) * | 2015-08-14 | 2016-01-20 | 江苏双仪光学器材有限公司 | Mode interference-based fine core cascaded optical fiber biosensor |
| CN106500740A (en) * | 2016-10-21 | 2017-03-15 | 天津理工大学 | A kind of Radix Triplostegiae Grandiflorae component opitical fiber sensor based on magnetic field and temperature and preparation method thereof |
| CN106500740B (en) * | 2016-10-21 | 2019-03-01 | 天津理工大学 | A kind of double parameter fibre optical sensors and preparation method thereof based on magnetic field and temperature |
| CN106596452A (en) * | 2016-12-30 | 2017-04-26 | 重庆理工大学 | Hydrogen sulfide gas sensor and manufacturing method thereof and hydrogen sulfide concentration detection method |
| CN106596452B (en) * | 2016-12-30 | 2019-03-22 | 重庆理工大学 | The detection method of these hydrogen sulfide gas sensor and preparation method thereof and concentration of hydrogen sulfide |
| CN106896277A (en) * | 2017-04-27 | 2017-06-27 | 北京航空航天大学 | A kind of electric-field sensor based on micro-nano optical fiber evanescent field and electro-optic polymer |
| CN106896277B (en) * | 2017-04-27 | 2020-03-17 | 北京航空航天大学 | Electric field sensor based on micro-nano optical fiber evanescent field and electro-optic polymer |
| CN111175987A (en) * | 2018-11-09 | 2020-05-19 | 青岛海信激光显示股份有限公司 | Laser spot dissipation device, laser spot dissipation method and laser projection equipment |
| CN110398620B (en) * | 2019-06-11 | 2024-03-15 | 南京邮电大学 | Capillary microcavity current sensor based on protein liquid core whispering gallery mode resonance |
| CN110579726A (en) * | 2019-10-15 | 2019-12-17 | 哈尔滨理工大学 | Spr-based high-sensitivity magnetic field sensing device |
| CN112881952A (en) * | 2020-12-28 | 2021-06-01 | 国网江西省电力有限公司信息通信分公司 | Magnetic field sensor and preparation method thereof |
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